Smart PC fan and watercooling controller

Smart control of the liquid cooling system in the PC to minimize noise, keeping temperatures in check!

May 28, 2022

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1 respects

entertainment system

liquid cooling

monitoring

Components and supplies

1x40 Male Pin Header

ntc thermistor 10k bedrahtet

Alphacool Icicle temperature sensor

Lamptron SP105 Hub

M2.5X8mm screws

Phobya Fan Power Connector 4Pin PWM male

USB-A to USB-B cable

Arduino UNO

Fan2Click

Internal USB to Motherboard cable

ADAC Click

Jumper wires (generic)

4pin pwm extension 30 cm

Female Header 8 Position 1 Row (0.1")

Tools and machines

Solder Wire, Lead Free

Soldering iron (generic)

3D Printer (generic)

UHU Super Power superglue

Project description

Code

Python program to send GPU data to Arduino over Serial

python

This program sends the GPU data (core and vram temps) and the info if the excavator is running. Important note: check line 25 and change the COM number to the one on which your Arduino is connected! Also, if you want the program to run in the background unseen, save it with a ".pyw" extension instead of ".py".

1from pynvraw import api, NvError, get_phys_gpu
2import serial, time,  psutil
3
4def checkIfProcessRunning(processName):
5    '''
6    Check if  there is any running process that contains the given name processName.
7    '''
8    #Iterate over the all the running process
9    for proc in psutil.process_iter():
10        try:
11            # Check if process name contains the given name string.
12            if processName.lower() in proc.name().lower():
13                return  True
14        except (psutil.NoSuchProcess, psutil.AccessDenied, psutil.ZombieProcess):
15            pass
16    return False;
17
18def main():
19    cuda_dev = 0
20    ser = serial.Serial()
21    ser.baudrate = 115200
22    ser.timeout = 0.1
23    ser.writeTimeout = 0.1
24    ser.setDTR(False) #THIS IS IMPORTANT - prevents  Arduino from resetting
25    ser.port = 'COM8' #Put the COM number to which your  Arduino is connected
26    dataBeginsInt = 32 #this is a spacebar, data follows  the Space char.
27    dataBeginsChar = dataBeginsInt;
28    dataCharOffset = 33
29    outputString = " {}{}{}{}\
30"
31    base = 94; #base for encoding temperature  numbers
32    while True:
33        try:
34            gpu = get_phys_gpu(cuda_dev)
35        except ValueError:
36            break
37        try:
38            api.restore_coolers(gpu.handle)
39        except NvError as err:
40            if err.status != 'NVAPI_NOT_SUPPORTED':
41                raise
42        
43        cuda_dev += 1
44        
45    while  True:
46        try:
47            if checkIfProcessRunning('excavator'):
48                ExcavRunning = 'Y'
49            else:
50                ExcavRunning  = 'N'
51            gpuCoreTemp10xInt = int(gpu.core_temp*10);
52            coreTempCharEncodedByte2  = int(gpuCoreTemp10xInt%base+dataCharOffset) #least significant byte of the core  temp encoded
53            coreTempCharEncodedByte1 = int((gpuCoreTemp10xInt-coreTempCharEncodedByte2+dataCharOffset)/base+dataCharOffset)  #most significant byte of the core temp encoded
54            vramTempCharEncodedByte1  = int(gpu.vram_temp)+dataCharOffset
55            ser.open()
56            ser.write(outputString.format(chr(coreTempCharEncodedByte1),chr(coreTempCharEncodedByte2),chr(vramTempCharEncodedByte1),ExcavRunning).encode())
57            ser.close()
58            time.sleep(0.5)
59        except:
60            time.sleep(0.10  )
61            print('Port Busy\
62')
63        
64
65if __name__ == '__main__':
66    main()

from pynvraw import api, NvError, get_phys_gpu
import serial, time,  psutil

def checkIfProcessRunning(processName):
    '''
    Check if  there is any running process that contains the given name processName.
    '''
    #Iterate over the all the running process
    for proc in psutil.process_iter():
        try:
            # Check if process name contains the given name string.
            if processName.lower() in proc.name().lower():
                return  True
        except (psutil.NoSuchProcess, psutil.AccessDenied, psutil.ZombieProcess):
            pass
    return False;

def main():
    cuda_dev = 0
    ser = serial.Serial()
    ser.baudrate = 115200
    ser.timeout = 0.1
    ser.writeTimeout = 0.1
    ser.setDTR(False) #THIS IS IMPORTANT - prevents  Arduino from resetting
    ser.port = 'COM8' #Put the COM number to which your  Arduino is connected
    dataBeginsInt = 32 #this is a spacebar, data follows  the Space char.
    dataBeginsChar = dataBeginsInt;
    dataCharOffset = 33
    outputString = " {}{}{}{}\
"
    base = 94; #base for encoding temperature  numbers
    while True:
        try:
            gpu = get_phys_gpu(cuda_dev)
        except ValueError:
            break
        try:
            api.restore_coolers(gpu.handle)
        except NvError as err:
            if err.status != 'NVAPI_NOT_SUPPORTED':
                raise
        
        cuda_dev += 1
        
    while  True:
        try:
            if checkIfProcessRunning('excavator'):
                ExcavRunning = 'Y'
            else:
                ExcavRunning  = 'N'
            gpuCoreTemp10xInt = int(gpu.core_temp*10);
            coreTempCharEncodedByte2  = int(gpuCoreTemp10xInt%base+dataCharOffset) #least significant byte of the core  temp encoded
            coreTempCharEncodedByte1 = int((gpuCoreTemp10xInt-coreTempCharEncodedByte2+dataCharOffset)/base+dataCharOffset)  #most significant byte of the core temp encoded
            vramTempCharEncodedByte1  = int(gpu.vram_temp)+dataCharOffset
            ser.open()
            ser.write(outputString.format(chr(coreTempCharEncodedByte1),chr(coreTempCharEncodedByte2),chr(vramTempCharEncodedByte1),ExcavRunning).encode())
            ser.close()
            time.sleep(0.5)
        except:
            time.sleep(0.10  )
            print('Port Busy\
')
        

if __name__ == '__main__':
    main()

Arduino sketch

c_cpp

The Arduino program, including the custom functions to drive the fan controller ICs over I2C, this is why it grew so big and may look intimidating. I packed everything into meaningful functions, so I hope you are able to figure it out!

1
2
3/* I2C LCD with Arduino example code. More info: https://www.makerguides.com   */
4
5// Include the libraries:
6// LiquidCrystal_I2C.h: https://github.com/johnrickman/LiquidCrystal_I2C
7#include   <Wire.h> // Library for I2C communication
8#include <LiquidCrystal_I2C.h> // Library   for LCD
9#include <AD5593R.h>
10#include <math.h>
11
12#define BAUD_RATE 115200
13#define   LOOP_INTERVAL 1200 //ms
14
15/* FAN CONTROL CONFIGURATION DEFINITIONS */
16#define   FANCTRL_I2C_ADDR 0x50
17
18#define FANCTRL_CR1_ADDR 0x00 //control register 1
19#define   FANCTRL_CR1_VAL B10011000
20
21#define FANCTRL_CR2_ADDR 0x01 //control register   2
22#define FANCTRL_CR2_VAL B00010001
23
24#define FANCTRL_CR3_ADDR 0x02 //control   register 3
25#define FANCTRL_CR3_VAL B00110001
26
27#define FANCTRL_FFDC_ADDR   0x03 //fan fail duty cycle
28#define FANCTRL_FFDC_VAL 0xF2 // 95% duty cycle at   failure detected
29
30#define FANCTRL_AMR_ADDR 0x04 //alert mask register
31#define   FANCTRL_AMR_VAL B11111111 // ignore all alerts (for testing)
32
33#define FANCTRL_DFCS_ADDR   0x50 //direct fan control PWM setting
34
35#define FANCTRL_CPWM_ADDR 0x51 //current   pwm reading
36
37#define FANCTRL_TACHH_ADDR 0x52 //high bits of tach
38#define   FANCTRL_TACHL_ADDR 0x53 //low bits of tach
39
40#define FANCTRL_TEMPH_ADDR 0x58   //high bits of temp
41#define FANCTRL_TEMPL_ADDR 0x59 //low bits of temp
42
43#define   FAN_PWM_MIN 72 //65 is ~25%
44#define FAN_PWM_MAX 255//110// 110 is 43%
45#define   PWM_DELTA_MAX 10 
46#define PWM_SLOPE 5
47
48
49#define TEMP_WATER_H T1
50#define   TEMP_WATER_L T2
51#define TEMP_AIR_H T3
52
53#define WATER_PUMP_CONTROL 1
54#define   FANS_CONTROL 2
55#define TEMP_DIFF_TARGET 1.7 //-0.3//, target difference between   TH and TL
56//#define TEMP_TARGET 34.0 //, target TL
57
58#define BASE_CONV 94
59#define   OFFS_CONV 33
60
61#define READ_TIMEOUT 500
62
63LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27,   20, 4);
64AD5593R AD5593R(0x10); //ADC init
65
66bool my_DACs[8] = {1,0,0,0,0,0,0,0};
67bool   my_ADCs[8] = {0,1,1,1,0,0,0,0};
68const int buttonPin = 2;
69
70volatile bool   backlightState = 1;
71volatile bool buttonPressed = 0;
72
73float v1, v2, v3,   R1, R2, R3, T1, T2, T3, T4, TC, TM; // real variables: voltage, resistance and temperature
74//const   char degC[3] = {4,'C',0}; // degC string for display
75const char degC[3] = {223,0};   // degC string for display
76const char Tlo[3] = {6,0}; // T_LO string for display
77const   char Thi[3] = {7,0}; // T_HI string for display
78const float TempTarget[2] = {45.0,40.0};//{40.0,25.0};//
79const   char TempNoData[5] = "--.-";//{165,165,'.',165,0};
80const char modeChar[2] =   {252,228};
81const char coreChar = 4;
82const char vramChar = 5;
83
84const   float vh = 2.0;//4.5; //V, high voltage for resistance measurement bias
85const   float T0 = 273.15; //K, temp equal 0
86const float A = 2.5490E-4; //A parameter   for recalculation of resistance to temp
87const float B = 1.0062E-3; //B parameter   for recalculation of resistance to temp
88const float Rr = 20000.0;//19800.0;//   kOhm
89const int N = 80; //averaging count
90//int i;
91
92unsigned long previousTime   = 0;
93unsigned long currentTime = 0;
94unsigned long prevButtonPress = 0;
95unsigned   long nowButtonPress = 0;
96unsigned long serialReadingBegins;
97
98String inputString;
99String   inputStringBuffer;
100bool miningMode = true;
101bool freshDataAvailable = false;
102
103
104//   Custom char definitions
105byte barChars0[8] = {
106  B10101,
107  B00000,
108  B10101,
109   B00000,
110  B10101,
111  B00000,
112  B10101,
113  B00000
114};
115byte barChars1[8]   = {
116  B10101,
117  B10000,
118  B10101,
119  B10000,
120  B10101,
121  B10000,
122   B10101,
123  B00000
124};
125byte barChars2[8] = {
126  B10101,
127  B10100,
128   B10101,
129  B10100,
130  B10101,
131  B10100,
132  B10101,
133  B00000
134};
135byte   barChars3[8] = {
136  B10101,
137  B10101,
138  B10101,
139  B10101,
140  B10101,
141   B10101,
142  B10101,
143  B00000
144};
145
146byte loSign[8] = {
147  B00000,
148   B11111,
149  B10111,
150  B10111,
151  B10001,
152  B11111,
153  B00000,
154  B00000
155};
156byte   hiSign[8] = {
157  B00000,
158  B11111,
159  B10101,
160  B10001,
161  B10101,
162   B11111,
163  B00000,
164  B00000
165};
166byte core[8] = {
167  B11110,
168  B11111,
169   B11110,
170  B11111,
171  B11011,
172  B11011,
173  B11111,
174  B11111
175};
176byte   vram[8] = {
177  B11110,
178  B11111,
179  B11110,
180  B11011,
181  B10101,
182   B10101,
183  B11011,
184  B11111
185};
186
187void setup() {
188  initializeI2CLCD();
189   //Serial setup
190  Serial.begin(BAUD_RATE);
191  Serial.setTimeout(100);
192
193   //Interrupt for button to toggle LCD backlight
194  pinMode(buttonPin, INPUT_PULLUP);
195   attachInterrupt(0, pin_ISR, FALLING);
196  
197  // Setup fan controllers
198   configureFan2Click(1);
199  configureFan2Click(2);
200  
201  configureADCs();
202
203   // Reserve memory for incoming strings form serial
204  inputString.reserve(20);   
205  inputStringBuffer.reserve(20);
206}
207
208void loop() {
209  currentTime   = millis();
210
211  //BACKLIGHT TOGGLE BUTTON CHECK W/ DEBOUNCER
212  if ( buttonPressed   ){
213    nowButtonPress = millis();
214    if (nowButtonPress-prevButtonPress>50){
215       prevButtonPress = nowButtonPress;
216      backlightState = !backlightState;
217       buttonPressed = 0;
218    }
219  }
220  
221  trySerialRead();
222
223  //BACKLIGHT   SET
224  if (backlightState){
225    lcd.backlight();
226  }
227  else{
228    lcd.noBacklight();
229   }
230  
231  //MAIN ACITON
232  if (currentTime - previousTime >= LOOP_INTERVAL)   {
233    previousTime = currentTime; // save the last executed time
234
235    getTemperatures();
236
237     changePWM(WATER_PUMP_CONTROL, TEMP_WATER_H - TEMP_WATER_L, TEMP_DIFF_TARGET);
238     changePWM(FANS_CONTROL, TEMP_WATER_L, TempTarget[miningMode]); //mining mode   bool chooses between the two array elements
239
240    displayUpdate();
241
242     freshDataAvailable = false; //set flag to await fresh data from serial
243  }
244}
245
246void   pin_ISR() { //pin interrupt for button press
247    buttonPressed = 1;
248}
249
250///////////////////////////////
251///   FUNCTIONS FOR FAN2CLICK ///
252///////////////////////////////
253
254void writeByteToFan2Click(int   num, uint8_t addr, uint8_t value){
255  //num - number of the fan controller, 1   or 2
256  uint8_t i2cAddress = FANCTRL_I2C_ADDR+num-1;
257  Wire.beginTransmission(i2cAddress);
258   Wire.write(addr);
259  Wire.write(value);
260  Wire.endTransmission();  
261}
262
263uint8_t   readByteFromFan2Click(int num, uint8_t addr){
264  //num - number of the fan controller,   1 or 2
265  uint8_t i2cAddress = FANCTRL_I2C_ADDR+num-1;
266  uint8_t reading =   0;
267  Wire.beginTransmission(i2cAddress);
268  Wire.write(addr);
269  Wire.endTransmission();   
270  Wire.requestFrom(i2cAddress, uint8_t(1));
271  if (1 <= Wire.available())   { // if one byte was received
272    reading = Wire.read();
273  }
274  return reading;
275}
276
277int   read2BytesFromFan2Click(int num, uint8_t addr){
278  //num - number of the fan controller,   1 or 2
279  int reading = readByteFromFan2Click(num, addr);
280  reading = reading<<8;
281   reading |= readByteFromFan2Click(num, addr+1);
282  return reading;
283}
284
285float   readInternalTempFan2Click(int num){
286  int reading = read2BytesFromFan2Click(num,   byte(FANCTRL_TEMPH_ADDR));
287  reading = reading>>5;
288  float Temperature = (float)reading/8;
289   return Temperature;
290}
291
292void setDirectPWMFan2Click(int num, byte pwm){
293   writeByteToFan2Click(num, byte(FANCTRL_DFCS_ADDR), pwm);
294}
295
296byte getCurrentPWMFan2Click(int   num){
297  byte pwm_current = readByteFromFan2Click(num, byte(FANCTRL_DFCS_ADDR));
298   return pwm_current;
299}
300
301float readTachometer(int num){
302  int reading   = read2BytesFromFan2Click(num, byte(FANCTRL_TACHH_ADDR));
303  float Tach = 6e6/(float)reading/2;   //division by 2 comes from number of tach pulses per revolution
304                                     //6e6   is the number of seconds in a minute times tach counter clock frequency
305  return   Tach;
306}
307
308void displayTach(int num, int i, int j){
309    //i,j - lcd cursor   indexes horisontal and vertical respectively,
310    //pwm - tach float value
311     float Tach = readTachometer(num);
312    lcd.setCursor(i, j);
313    if (Tach<1000){
314       lcd.print(" "); 
315    }
316    if (Tach<0){
317      lcd.print("  ");
318       Tach = 0;
319    }
320    lcd.print(Tach,0);
321}
322
323bool checkAndWriteByteToFan2Click(int   num, uint8_t addr, uint8_t val){
324  uint8_t val_read = readByteFromFan2Click(num,   addr);
325  bool rewritten = false;
326  if(val_read != val){
327    writeByteToFan2Click(num,   addr, val);
328    rewritten = true;
329  }
330  return rewritten;
331}
332
333void   configureFan2Click(int num){
334  int rewrittenSum = 0;
335  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,   byte(FANCTRL_CR1_ADDR),  byte(FANCTRL_CR1_VAL) );
336  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,   byte(FANCTRL_CR2_ADDR),  byte(FANCTRL_CR2_VAL) );
337  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,   byte(FANCTRL_CR3_ADDR),  byte(FANCTRL_CR3_VAL) );
338  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,   byte(FANCTRL_FFDC_ADDR), byte(FANCTRL_FFDC_VAL));
339  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,   byte(FANCTRL_AMR_ADDR),  byte(FANCTRL_AMR_VAL) );
340  /* DEBUGGING DISPLAY
341   lcd.setCursor(0, 0+(num-1)*2);
342  lcd.print("Fan Controller #"); 
343  lcd.print(num);
344   lcd.setCursor(0, 1+(num-1)*2);  
345  lcd.print(rewrittenSum);
346  lcd.print("   settings changed."); */
347}
348
349void changePWM(int num, float Temp, float TempSetPoint){
350     int pwm = getCurrentPWMFan2Click(num);
351
352    //COMPUTE DELTA PWM
353    int   deltaPWM = (Temp-TempSetPoint)*PWM_SLOPE;
354    if(deltaPWM>PWM_DELTA_MAX){
355       deltaPWM = PWM_DELTA_MAX;
356    }
357    else if(deltaPWM<-PWM_DELTA_MAX){
358       deltaPWM = -PWM_DELTA_MAX;
359    }
360
361    //CHANGE PWM BY PWM DELTA
362     pwm = pwm+deltaPWM;
363    if(pwm>FAN_PWM_MAX){
364      pwm=FAN_PWM_MAX;
365     }
366    else if(pwm<FAN_PWM_MIN){
367      pwm=FAN_PWM_MIN;
368    }
369    
370     setDirectPWMFan2Click(num, pwm);
371}
372
373void displayPWMChart(int num, int   i, int j){
374  int pwm = getCurrentPWMFan2Click(num);
375  int bars = (pwm+7)*18/255;   //18 is the total number of bars
376  int rest;
377  int divn;
378  char barChart[6]   = {0,0,0,0,0,0};
379  int k;
380  divn = bars/3;
381  rest = bars%3;
382  for (k=0;k<divn;k++){
383     barChart[k] = 3;
384  }
385  if(rest){
386    barChart[divn] = rest;
387  }
388   lcd.setCursor(i, j);
389//  lcd.print("F"); 
390//  lcd.print(num); 
391//  lcd.print(":   "); 
392  if (num==WATER_PUMP_CONTROL){
393    lcd.print("Pump");
394  }
395   else if(num==FANS_CONTROL){
396    lcd.print("Fans");
397  }
398  for(k=0;k<6;k++){
399     lcd.print(barChart[k]); 
400  }
401}
402
403
404///////////////////////
405///   OTHER FUNCTIONS ///
406///////////////////////
407
408
409void displayTemp(int i,   int j, float T, int n){
410    //i,j - lcd cursor indexes horisontal and vertical   respectively,
411    //T - temp, n - digits after decimal point
412    lcd.setCursor(i,   j);
413    if(T<10 && T>=0){
414      lcd.print("+"); 
415    }
416    if(T<-50.0){   // if there is no temp data for this one, I assigned a value of -100.
417      lcd.print(TempNoData);       
418    }
419    else{
420      lcd.print(T,n); 
421    }
422    lcd.print(degC);
423}
424
425void   getTemperatures(){
426  
427    T1 = 0;
428    T2 = 0;
429    T3 = 0;
430    AD5593R.write_DAC(0,vh);
431     int i;
432    for(i=1;i<N+1;i++){
433      v1 = AD5593R.read_ADC(1);
434      v2   = AD5593R.read_ADC(2);
435      v3 = AD5593R.read_ADC(3);
436      R2 = Rr*v2/(vh-v1);
437       R1 = Rr/(vh/v1-1)-R2;
438      R3 = 0.5*Rr/(vh/v3-1);
439      T1 = T1+(1/(A*log(R1)+B)-T0);
440       T2 = T2+(1/(A*log(R2)+B)-T0); 
441      T3 = T3+(1/(A*log(R3)+B)-T0);     
442     }
443    T1 = T1/N;
444    T2 = T2/N;
445    T3 = T3/N;
446    T4 = readInternalTempFan2Click(1);
447     AD5593R.write_DAC(0,0);
448    
449    if ( freshDataAvailable ){
450      TC   = .1*((inputString.charAt(1)-OFFS_CONV)+(inputString.charAt(0)-OFFS_CONV)*BASE_CONV);
451       TM = 1.0*(inputString.charAt(2)-OFFS_CONV);
452      miningMode = (inputString.charAt(3)   == 'Y');
453    }
454    else{
455      TC = -100.0; // values to indicate lack   of data in the function that prints temps on LCD
456      TM = -100.0;
457      miningMode   = true; 
458    }
459}
460
461void initializeI2CLCD(){
462  lcd.init();
463  lcd.clear();
464   lcd.createChar(0, barChars0);
465  lcd.createChar(1, barChars1);
466  lcd.createChar(2,   barChars2);
467  lcd.createChar(3, barChars3);
468  lcd.createChar(4, core);
469   lcd.createChar(5, vram);
470  lcd.createChar(6, loSign);
471  lcd.createChar(7,   hiSign);
472  backlightState = true;
473}
474
475void configureADCs(){
476    AD5593R.enable_internal_Vref();
477     AD5593R.set_DAC_max_1x_Vref();
478    AD5593R.set_ADC_max_1x_Vref();
479    AD5593R.configure_DACs(my_DACs);
480     AD5593R.configure_ADCs(my_ADCs);
481}
482
483void displayUpdate(){
484  lcd.setCursor(0,   0);
485  lcd.print(Thi);
486  displayTemp(1, 0, TEMP_WATER_H, 1);
487    
488  lcd.setCursor(0,   1);
489  lcd.print(Tlo);
490  displayTemp(1, 1, TEMP_WATER_L, 1);
491     
492  displayTemp(1,   2, TEMP_WATER_H - TEMP_WATER_L, 1);
493          
494  lcd.setCursor(0, 3);
495   lcd.print(char(127));
496  displayTemp(1, 3, TEMP_AIR_H, 1); 
497
498  lcd.setCursor(6,   0);
499  lcd.print(coreChar); 
500  displayTemp(7, 0, TC, 1); 
501  lcd.setCursor(6,   1);
502  lcd.print(vramChar); 
503  displayTemp(7, 1, TM, 1);
504    
505  lcd.setCursor(12,   0);
506  lcd.print("[Mode:");
507  lcd.print(modeChar[miningMode]);
508  lcd.print("]");
509
510   displayPWMChart(WATER_PUMP_CONTROL, 6, 2);
511  displayPWMChart(FANS_CONTROL,   6, 3);  
512    
513  lcd.setCursor(17, 1);
514  lcd.print("RPM");
515  displayTach(WATER_PUMP_CONTROL,   16, 2);
516  displayTach(FANS_CONTROL, 16, 3);
517}
518
519void trySerialRead(){
520   if ( Serial.available() ){
521    serialReadingBegins = millis();
522    while(Serial.read()!='   ' && (millis()-serialReadingBegins)<READ_TIMEOUT){
523      //Do nothing
524    }
525     inputStringBuffer = Serial.readStringUntil('\
526');
527    if(inputStringBuffer.indexOf(char(0x09))!=-1){   //if string contains char 0x09 (tabulator)
528      backlightState = !backlightState;
529     }
530    if(inputStringBuffer.length()==4){
531      inputString = inputStringBuffer;
532       freshDataAvailable = true;
533    }
534  }
535}
536


/* I2C LCD with Arduino example code. More info: https://www.makerguides.com   */

// Include the libraries:
// LiquidCrystal_I2C.h: https://github.com/johnrickman/LiquidCrystal_I2C
#include   <Wire.h> // Library for I2C communication
#include <LiquidCrystal_I2C.h> // Library   for LCD
#include <AD5593R.h>
#include <math.h>

#define BAUD_RATE 115200
#define   LOOP_INTERVAL 1200 //ms

/* FAN CONTROL CONFIGURATION DEFINITIONS */
#define   FANCTRL_I2C_ADDR 0x50

#define FANCTRL_CR1_ADDR 0x00 //control register 1
#define   FANCTRL_CR1_VAL B10011000

#define FANCTRL_CR2_ADDR 0x01 //control register   2
#define FANCTRL_CR2_VAL B00010001

#define FANCTRL_CR3_ADDR 0x02 //control   register 3
#define FANCTRL_CR3_VAL B00110001

#define FANCTRL_FFDC_ADDR   0x03 //fan fail duty cycle
#define FANCTRL_FFDC_VAL 0xF2 // 95% duty cycle at   failure detected

#define FANCTRL_AMR_ADDR 0x04 //alert mask register
#define   FANCTRL_AMR_VAL B11111111 // ignore all alerts (for testing)

#define FANCTRL_DFCS_ADDR   0x50 //direct fan control PWM setting

#define FANCTRL_CPWM_ADDR 0x51 //current   pwm reading

#define FANCTRL_TACHH_ADDR 0x52 //high bits of tach
#define   FANCTRL_TACHL_ADDR 0x53 //low bits of tach

#define FANCTRL_TEMPH_ADDR 0x58   //high bits of temp
#define FANCTRL_TEMPL_ADDR 0x59 //low bits of temp

#define   FAN_PWM_MIN 72 //65 is ~25%
#define FAN_PWM_MAX 255//110// 110 is 43%
#define   PWM_DELTA_MAX 10 
#define PWM_SLOPE 5


#define TEMP_WATER_H T1
#define   TEMP_WATER_L T2
#define TEMP_AIR_H T3

#define WATER_PUMP_CONTROL 1
#define   FANS_CONTROL 2
#define TEMP_DIFF_TARGET 1.7 //-0.3//, target difference between   TH and TL
//#define TEMP_TARGET 34.0 //, target TL

#define BASE_CONV 94
#define   OFFS_CONV 33

#define READ_TIMEOUT 500

LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27,   20, 4);
AD5593R AD5593R(0x10); //ADC init

bool my_DACs[8] = {1,0,0,0,0,0,0,0};
bool   my_ADCs[8] = {0,1,1,1,0,0,0,0};
const int buttonPin = 2;

volatile bool   backlightState = 1;
volatile bool buttonPressed = 0;

float v1, v2, v3,   R1, R2, R3, T1, T2, T3, T4, TC, TM; // real variables: voltage, resistance and temperature
//const   char degC[3] = {4,'C',0}; // degC string for display
const char degC[3] = {223,0};   // degC string for display
const char Tlo[3] = {6,0}; // T_LO string for display
const   char Thi[3] = {7,0}; // T_HI string for display
const float TempTarget[2] = {45.0,40.0};//{40.0,25.0};//
const   char TempNoData[5] = "--.-";//{165,165,'.',165,0};
const char modeChar[2] =   {252,228};
const char coreChar = 4;
const char vramChar = 5;

const   float vh = 2.0;//4.5; //V, high voltage for resistance measurement bias
const   float T0 = 273.15; //K, temp equal 0
const float A = 2.5490E-4; //A parameter   for recalculation of resistance to temp
const float B = 1.0062E-3; //B parameter   for recalculation of resistance to temp
const float Rr = 20000.0;//19800.0;//   kOhm
const int N = 80; //averaging count
//int i;

unsigned long previousTime   = 0;
unsigned long currentTime = 0;
unsigned long prevButtonPress = 0;
unsigned   long nowButtonPress = 0;
unsigned long serialReadingBegins;

String inputString;
String   inputStringBuffer;
bool miningMode = true;
bool freshDataAvailable = false;


//   Custom char definitions
byte barChars0[8] = {
  B10101,
  B00000,
  B10101,
   B00000,
  B10101,
  B00000,
  B10101,
  B00000
};
byte barChars1[8]   = {
  B10101,
  B10000,
  B10101,
  B10000,
  B10101,
  B10000,
   B10101,
  B00000
};
byte barChars2[8] = {
  B10101,
  B10100,
   B10101,
  B10100,
  B10101,
  B10100,
  B10101,
  B00000
};
byte   barChars3[8] = {
  B10101,
  B10101,
  B10101,
  B10101,
  B10101,
   B10101,
  B10101,
  B00000
};

byte loSign[8] = {
  B00000,
   B11111,
  B10111,
  B10111,
  B10001,
  B11111,
  B00000,
  B00000
};
byte   hiSign[8] = {
  B00000,
  B11111,
  B10101,
  B10001,
  B10101,
   B11111,
  B00000,
  B00000
};
byte core[8] = {
  B11110,
  B11111,
   B11110,
  B11111,
  B11011,
  B11011,
  B11111,
  B11111
};
byte   vram[8] = {
  B11110,
  B11111,
  B11110,
  B11011,
  B10101,
   B10101,
  B11011,
  B11111
};

void setup() {
  initializeI2CLCD();
   //Serial setup
  Serial.begin(BAUD_RATE);
  Serial.setTimeout(100);

   //Interrupt for button to toggle LCD backlight
  pinMode(buttonPin, INPUT_PULLUP);
   attachInterrupt(0, pin_ISR, FALLING);
  
  // Setup fan controllers
   configureFan2Click(1);
  configureFan2Click(2);
  
  configureADCs();

   // Reserve memory for incoming strings form serial
  inputString.reserve(20);   
  inputStringBuffer.reserve(20);
}

void loop() {
  currentTime   = millis();

  //BACKLIGHT TOGGLE BUTTON CHECK W/ DEBOUNCER
  if ( buttonPressed   ){
    nowButtonPress = millis();
    if (nowButtonPress-prevButtonPress>50){
       prevButtonPress = nowButtonPress;
      backlightState = !backlightState;
       buttonPressed = 0;
    }
  }
  
  trySerialRead();

  //BACKLIGHT   SET
  if (backlightState){
    lcd.backlight();
  }
  else{
    lcd.noBacklight();
   }
  
  //MAIN ACITON
  if (currentTime - previousTime >= LOOP_INTERVAL)   {
    previousTime = currentTime; // save the last executed time

    getTemperatures();

     changePWM(WATER_PUMP_CONTROL, TEMP_WATER_H - TEMP_WATER_L, TEMP_DIFF_TARGET);
     changePWM(FANS_CONTROL, TEMP_WATER_L, TempTarget[miningMode]); //mining mode   bool chooses between the two array elements

    displayUpdate();

     freshDataAvailable = false; //set flag to await fresh data from serial
  }
}

void   pin_ISR() { //pin interrupt for button press
    buttonPressed = 1;
}

///////////////////////////////
///   FUNCTIONS FOR FAN2CLICK ///
///////////////////////////////

void writeByteToFan2Click(int   num, uint8_t addr, uint8_t value){
  //num - number of the fan controller, 1   or 2
  uint8_t i2cAddress = FANCTRL_I2C_ADDR+num-1;
  Wire.beginTransmission(i2cAddress);
   Wire.write(addr);
  Wire.write(value);
  Wire.endTransmission();  
}

uint8_t   readByteFromFan2Click(int num, uint8_t addr){
  //num - number of the fan controller,   1 or 2
  uint8_t i2cAddress = FANCTRL_I2C_ADDR+num-1;
  uint8_t reading =   0;
  Wire.beginTransmission(i2cAddress);
  Wire.write(addr);
  Wire.endTransmission();   
  Wire.requestFrom(i2cAddress, uint8_t(1));
  if (1 <= Wire.available())   { // if one byte was received
    reading = Wire.read();
  }
  return reading;
}

int   read2BytesFromFan2Click(int num, uint8_t addr){
  //num - number of the fan controller,   1 or 2
  int reading = readByteFromFan2Click(num, addr);
  reading = reading<<8;
   reading |= readByteFromFan2Click(num, addr+1);
  return reading;
}

float   readInternalTempFan2Click(int num){
  int reading = read2BytesFromFan2Click(num,   byte(FANCTRL_TEMPH_ADDR));
  reading = reading>>5;
  float Temperature = (float)reading/8;
   return Temperature;
}

void setDirectPWMFan2Click(int num, byte pwm){
   writeByteToFan2Click(num, byte(FANCTRL_DFCS_ADDR), pwm);
}

byte getCurrentPWMFan2Click(int   num){
  byte pwm_current = readByteFromFan2Click(num, byte(FANCTRL_DFCS_ADDR));
   return pwm_current;
}

float readTachometer(int num){
  int reading   = read2BytesFromFan2Click(num, byte(FANCTRL_TACHH_ADDR));
  float Tach = 6e6/(float)reading/2;   //division by 2 comes from number of tach pulses per revolution
                                     //6e6   is the number of seconds in a minute times tach counter clock frequency
  return   Tach;
}

void displayTach(int num, int i, int j){
    //i,j - lcd cursor   indexes horisontal and vertical respectively,
    //pwm - tach float value
     float Tach = readTachometer(num);
    lcd.setCursor(i, j);
    if (Tach<1000){
       lcd.print(" "); 
    }
    if (Tach<0){
      lcd.print("  ");
       Tach = 0;
    }
    lcd.print(Tach,0);
}

bool checkAndWriteByteToFan2Click(int   num, uint8_t addr, uint8_t val){
  uint8_t val_read = readByteFromFan2Click(num,   addr);
  bool rewritten = false;
  if(val_read != val){
    writeByteToFan2Click(num,   addr, val);
    rewritten = true;
  }
  return rewritten;
}

void   configureFan2Click(int num){
  int rewrittenSum = 0;
  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,   byte(FANCTRL_CR1_ADDR),  byte(FANCTRL_CR1_VAL) );
  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,   byte(FANCTRL_CR2_ADDR),  byte(FANCTRL_CR2_VAL) );
  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,   byte(FANCTRL_CR3_ADDR),  byte(FANCTRL_CR3_VAL) );
  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,   byte(FANCTRL_FFDC_ADDR), byte(FANCTRL_FFDC_VAL));
  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,   byte(FANCTRL_AMR_ADDR),  byte(FANCTRL_AMR_VAL) );
  /* DEBUGGING DISPLAY
   lcd.setCursor(0, 0+(num-1)*2);
  lcd.print("Fan Controller #"); 
  lcd.print(num);
   lcd.setCursor(0, 1+(num-1)*2);  
  lcd.print(rewrittenSum);
  lcd.print("   settings changed."); */
}

void changePWM(int num, float Temp, float TempSetPoint){
     int pwm = getCurrentPWMFan2Click(num);

    //COMPUTE DELTA PWM
    int   deltaPWM = (Temp-TempSetPoint)*PWM_SLOPE;
    if(deltaPWM>PWM_DELTA_MAX){
       deltaPWM = PWM_DELTA_MAX;
    }
    else if(deltaPWM<-PWM_DELTA_MAX){
       deltaPWM = -PWM_DELTA_MAX;
    }

    //CHANGE PWM BY PWM DELTA
     pwm = pwm+deltaPWM;
    if(pwm>FAN_PWM_MAX){
      pwm=FAN_PWM_MAX;
     }
    else if(pwm<FAN_PWM_MIN){
      pwm=FAN_PWM_MIN;
    }
    
     setDirectPWMFan2Click(num, pwm);
}

void displayPWMChart(int num, int   i, int j){
  int pwm = getCurrentPWMFan2Click(num);
  int bars = (pwm+7)*18/255;   //18 is the total number of bars
  int rest;
  int divn;
  char barChart[6]   = {0,0,0,0,0,0};
  int k;
  divn = bars/3;
  rest = bars%3;
  for (k=0;k<divn;k++){
     barChart[k] = 3;
  }
  if(rest){
    barChart[divn] = rest;
  }
   lcd.setCursor(i, j);
//  lcd.print("F"); 
//  lcd.print(num); 
//  lcd.print(":   "); 
  if (num==WATER_PUMP_CONTROL){
    lcd.print("Pump");
  }
   else if(num==FANS_CONTROL){
    lcd.print("Fans");
  }
  for(k=0;k<6;k++){
     lcd.print(barChart[k]); 
  }
}


///////////////////////
///   OTHER FUNCTIONS ///
///////////////////////


void displayTemp(int i,   int j, float T, int n){
    //i,j - lcd cursor indexes horisontal and vertical   respectively,
    //T - temp, n - digits after decimal point
    lcd.setCursor(i,   j);
    if(T<10 && T>=0){
      lcd.print("+"); 
    }
    if(T<-50.0){   // if there is no temp data for this one, I assigned a value of -100.
      lcd.print(TempNoData);       
    }
    else{
      lcd.print(T,n); 
    }
    lcd.print(degC);
}

void   getTemperatures(){
  
    T1 = 0;
    T2 = 0;
    T3 = 0;
    AD5593R.write_DAC(0,vh);
     int i;
    for(i=1;i<N+1;i++){
      v1 = AD5593R.read_ADC(1);
      v2   = AD5593R.read_ADC(2);
      v3 = AD5593R.read_ADC(3);
      R2 = Rr*v2/(vh-v1);
       R1 = Rr/(vh/v1-1)-R2;
      R3 = 0.5*Rr/(vh/v3-1);
      T1 = T1+(1/(A*log(R1)+B)-T0);
       T2 = T2+(1/(A*log(R2)+B)-T0); 
      T3 = T3+(1/(A*log(R3)+B)-T0);     
     }
    T1 = T1/N;
    T2 = T2/N;
    T3 = T3/N;
    T4 = readInternalTempFan2Click(1);
     AD5593R.write_DAC(0,0);
    
    if ( freshDataAvailable ){
      TC   = .1*((inputString.charAt(1)-OFFS_CONV)+(inputString.charAt(0)-OFFS_CONV)*BASE_CONV);
       TM = 1.0*(inputString.charAt(2)-OFFS_CONV);
      miningMode = (inputString.charAt(3)   == 'Y');
    }
    else{
      TC = -100.0; // values to indicate lack   of data in the function that prints temps on LCD
      TM = -100.0;
      miningMode   = true; 
    }
}

void initializeI2CLCD(){
  lcd.init();
  lcd.clear();
   lcd.createChar(0, barChars0);
  lcd.createChar(1, barChars1);
  lcd.createChar(2,   barChars2);
  lcd.createChar(3, barChars3);
  lcd.createChar(4, core);
   lcd.createChar(5, vram);
  lcd.createChar(6, loSign);
  lcd.createChar(7,   hiSign);
  backlightState = true;
}

void configureADCs(){
    AD5593R.enable_internal_Vref();
     AD5593R.set_DAC_max_1x_Vref();
    AD5593R.set_ADC_max_1x_Vref();
    AD5593R.configure_DACs(my_DACs);
     AD5593R.configure_ADCs(my_ADCs);
}

void displayUpdate(){
  lcd.setCursor(0,   0);
  lcd.print(Thi);
  displayTemp(1, 0, TEMP_WATER_H, 1);
    
  lcd.setCursor(0,   1);
  lcd.print(Tlo);
  displayTemp(1, 1, TEMP_WATER_L, 1);
     
  displayTemp(1,   2, TEMP_WATER_H - TEMP_WATER_L, 1);
          
  lcd.setCursor(0, 3);
   lcd.print(char(127));
  displayTemp(1, 3, TEMP_AIR_H, 1); 

  lcd.setCursor(6,   0);
  lcd.print(coreChar); 
  displayTemp(7, 0, TC, 1); 
  lcd.setCursor(6,   1);
  lcd.print(vramChar); 
  displayTemp(7, 1, TM, 1);
    
  lcd.setCursor(12,   0);
  lcd.print("[Mode:");
  lcd.print(modeChar[miningMode]);
  lcd.print("]");

   displayPWMChart(WATER_PUMP_CONTROL, 6, 2);
  displayPWMChart(FANS_CONTROL,   6, 3);  
    
  lcd.setCursor(17, 1);
  lcd.print("RPM");
  displayTach(WATER_PUMP_CONTROL,   16, 2);
  displayTach(FANS_CONTROL, 16, 3);
}

void trySerialRead(){
   if ( Serial.available() ){
    serialReadingBegins = millis();
    while(Serial.read()!='   ' && (millis()-serialReadingBegins)<READ_TIMEOUT){
      //Do nothing
    }
     inputStringBuffer = Serial.readStringUntil('\
');
    if(inputStringBuffer.indexOf(char(0x09))!=-1){   //if string contains char 0x09 (tabulator)
      backlightState = !backlightState;
     }
    if(inputStringBuffer.length()==4){
      inputString = inputStringBuffer;
       freshDataAvailable = true;
    }
  }
}

LCD backlight toggle Python program

python

This program sends the spacebar and tabulator to Arduino over Serial, which triggers LCD backlight toggle. Important note: check line 10 and change the COM number to the one on which your Arduino is connected! Also, if you want the program to run in the background unseen, save it with a ".pyw" extension instead of ".py".

1import serial
2import time
3
4def main():
5    ser = serial.Serial()
6    ser.baudrate = 115200
7    ser.timeout = 0.1
8    ser.writeTimeout = 0.1
9    ser.setDTR(False)
10    ser.port = 'COM8'
11    a = " \\x09\
12" #\\x09 is  the tabulator.
13    trying = 1
14    while trying:
15        try:
16            ser.open()
17            ser.write(a.encode())
18            ser.close()
19            trying  = 0
20        except:
21            time.sleep(0.1)
22    
23if __name__ ==  '__main__':
24    main()
25

import serial
import time

def main():
    ser = serial.Serial()
    ser.baudrate = 115200
    ser.timeout = 0.1
    ser.writeTimeout = 0.1
    ser.setDTR(False)
    ser.port = 'COM8'
    a = " \\x09\
" #\\x09 is  the tabulator.
    trying = 1
    while trying:
        try:
            ser.open()
            ser.write(a.encode())
            ser.close()
            trying  = 0
        except:
            time.sleep(0.1)
    
if __name__ ==  '__main__':
    main()

Arduino sketch

c_cpp

1
2
3/* I2C LCD with Arduino example code. More info: https://www.makerguides.com  */
4
5// Include the libraries:
6// LiquidCrystal_I2C.h: https://github.com/johnrickman/LiquidCrystal_I2C
7#include  <Wire.h> // Library for I2C communication
8#include <LiquidCrystal_I2C.h> // Library  for LCD
9#include <AD5593R.h>
10#include <math.h>
11
12#define BAUD_RATE 115200
13#define  LOOP_INTERVAL 1200 //ms
14
15/* FAN CONTROL CONFIGURATION DEFINITIONS */
16#define  FANCTRL_I2C_ADDR 0x50
17
18#define FANCTRL_CR1_ADDR 0x00 //control register 1
19#define  FANCTRL_CR1_VAL B10011000
20
21#define FANCTRL_CR2_ADDR 0x01 //control register  2
22#define FANCTRL_CR2_VAL B00010001
23
24#define FANCTRL_CR3_ADDR 0x02 //control  register 3
25#define FANCTRL_CR3_VAL B00110001
26
27#define FANCTRL_FFDC_ADDR  0x03 //fan fail duty cycle
28#define FANCTRL_FFDC_VAL 0xF2 // 95% duty cycle at  failure detected
29
30#define FANCTRL_AMR_ADDR 0x04 //alert mask register
31#define  FANCTRL_AMR_VAL B11111111 // ignore all alerts (for testing)
32
33#define FANCTRL_DFCS_ADDR  0x50 //direct fan control PWM setting
34
35#define FANCTRL_CPWM_ADDR 0x51 //current  pwm reading
36
37#define FANCTRL_TACHH_ADDR 0x52 //high bits of tach
38#define  FANCTRL_TACHL_ADDR 0x53 //low bits of tach
39
40#define FANCTRL_TEMPH_ADDR 0x58  //high bits of temp
41#define FANCTRL_TEMPL_ADDR 0x59 //low bits of temp
42
43#define  FAN_PWM_MIN 72 //65 is ~25%
44#define FAN_PWM_MAX 255//110// 110 is 43%
45#define  PWM_DELTA_MAX 10 
46#define PWM_SLOPE 5
47
48
49#define TEMP_WATER_H T1
50#define  TEMP_WATER_L T2
51#define TEMP_AIR_H T3
52
53#define WATER_PUMP_CONTROL 1
54#define  FANS_CONTROL 2
55#define TEMP_DIFF_TARGET 1.7 //-0.3//, target difference between  TH and TL
56//#define TEMP_TARGET 34.0 //, target TL
57
58#define BASE_CONV 94
59#define  OFFS_CONV 33
60
61#define READ_TIMEOUT 500
62
63LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27,  20, 4);
64AD5593R AD5593R(0x10); //ADC init
65
66bool my_DACs[8] = {1,0,0,0,0,0,0,0};
67bool  my_ADCs[8] = {0,1,1,1,0,0,0,0};
68const int buttonPin = 2;
69
70volatile bool  backlightState = 1;
71volatile bool buttonPressed = 0;
72
73float v1, v2, v3,  R1, R2, R3, T1, T2, T3, T4, TC, TM; // real variables: voltage, resistance and temperature
74//const  char degC[3] = {4,'C',0}; // degC string for display
75const char degC[3] = {223,0};  // degC string for display
76const char Tlo[3] = {6,0}; // T_LO string for display
77const  char Thi[3] = {7,0}; // T_HI string for display
78const float TempTarget[2] = {45.0,40.0};//{40.0,25.0};//
79const  char TempNoData[5] = "--.-";//{165,165,'.',165,0};
80const char modeChar[2] =  {252,228};
81const char coreChar = 4;
82const char vramChar = 5;
83
84const  float vh = 2.0;//4.5; //V, high voltage for resistance measurement bias
85const  float T0 = 273.15; //K, temp equal 0
86const float A = 2.5490E-4; //A parameter  for recalculation of resistance to temp
87const float B = 1.0062E-3; //B parameter  for recalculation of resistance to temp
88const float Rr = 20000.0;//19800.0;//  kOhm
89const int N = 80; //averaging count
90//int i;
91
92unsigned long previousTime  = 0;
93unsigned long currentTime = 0;
94unsigned long prevButtonPress = 0;
95unsigned  long nowButtonPress = 0;
96unsigned long serialReadingBegins;
97
98String inputString;
99String  inputStringBuffer;
100bool miningMode = true;
101bool freshDataAvailable = false;
102
103
104//  Custom char definitions
105byte barChars0[8] = {
106  B10101,
107  B00000,
108  B10101,
109  B00000,
110  B10101,
111  B00000,
112  B10101,
113  B00000
114};
115byte barChars1[8]  = {
116  B10101,
117  B10000,
118  B10101,
119  B10000,
120  B10101,
121  B10000,
122  B10101,
123  B00000
124};
125byte barChars2[8] = {
126  B10101,
127  B10100,
128  B10101,
129  B10100,
130  B10101,
131  B10100,
132  B10101,
133  B00000
134};
135byte  barChars3[8] = {
136  B10101,
137  B10101,
138  B10101,
139  B10101,
140  B10101,
141  B10101,
142  B10101,
143  B00000
144};
145
146byte loSign[8] = {
147  B00000,
148  B11111,
149  B10111,
150  B10111,
151  B10001,
152  B11111,
153  B00000,
154  B00000
155};
156byte  hiSign[8] = {
157  B00000,
158  B11111,
159  B10101,
160  B10001,
161  B10101,
162  B11111,
163  B00000,
164  B00000
165};
166byte core[8] = {
167  B11110,
168  B11111,
169  B11110,
170  B11111,
171  B11011,
172  B11011,
173  B11111,
174  B11111
175};
176byte  vram[8] = {
177  B11110,
178  B11111,
179  B11110,
180  B11011,
181  B10101,
182  B10101,
183  B11011,
184  B11111
185};
186
187void setup() {
188  initializeI2CLCD();
189  //Serial setup
190  Serial.begin(BAUD_RATE);
191  Serial.setTimeout(100);
192
193  //Interrupt for button to toggle LCD backlight
194  pinMode(buttonPin, INPUT_PULLUP);
195  attachInterrupt(0, pin_ISR, FALLING);
196  
197  // Setup fan controllers
198  configureFan2Click(1);
199  configureFan2Click(2);
200  
201  configureADCs();
202
203  // Reserve memory for incoming strings form serial
204  inputString.reserve(20);  
205  inputStringBuffer.reserve(20);
206}
207
208void loop() {
209  currentTime  = millis();
210
211  //BACKLIGHT TOGGLE BUTTON CHECK W/ DEBOUNCER
212  if ( buttonPressed  ){
213    nowButtonPress = millis();
214    if (nowButtonPress-prevButtonPress>50){
215      prevButtonPress = nowButtonPress;
216      backlightState = !backlightState;
217      buttonPressed = 0;
218    }
219  }
220  
221  trySerialRead();
222
223  //BACKLIGHT  SET
224  if (backlightState){
225    lcd.backlight();
226  }
227  else{
228    lcd.noBacklight();
229  }
230  
231  //MAIN ACITON
232  if (currentTime - previousTime >= LOOP_INTERVAL)  {
233    previousTime = currentTime; // save the last executed time
234
235    getTemperatures();
236
237    changePWM(WATER_PUMP_CONTROL, TEMP_WATER_H - TEMP_WATER_L, TEMP_DIFF_TARGET);
238    changePWM(FANS_CONTROL, TEMP_WATER_L, TempTarget[miningMode]); //mining mode  bool chooses between the two array elements
239
240    displayUpdate();
241
242    freshDataAvailable = false; //set flag to await fresh data from serial
243  }
244}
245
246void  pin_ISR() { //pin interrupt for button press
247    buttonPressed = 1;
248}
249
250///////////////////////////////
251///  FUNCTIONS FOR FAN2CLICK ///
252///////////////////////////////
253
254void writeByteToFan2Click(int  num, uint8_t addr, uint8_t value){
255  //num - number of the fan controller, 1  or 2
256  uint8_t i2cAddress = FANCTRL_I2C_ADDR+num-1;
257  Wire.beginTransmission(i2cAddress);
258  Wire.write(addr);
259  Wire.write(value);
260  Wire.endTransmission();  
261}
262
263uint8_t  readByteFromFan2Click(int num, uint8_t addr){
264  //num - number of the fan controller,  1 or 2
265  uint8_t i2cAddress = FANCTRL_I2C_ADDR+num-1;
266  uint8_t reading =  0;
267  Wire.beginTransmission(i2cAddress);
268  Wire.write(addr);
269  Wire.endTransmission();  
270  Wire.requestFrom(i2cAddress, uint8_t(1));
271  if (1 <= Wire.available())  { // if one byte was received
272    reading = Wire.read();
273  }
274  return reading;
275}
276
277int  read2BytesFromFan2Click(int num, uint8_t addr){
278  //num - number of the fan controller,  1 or 2
279  int reading = readByteFromFan2Click(num, addr);
280  reading = reading<<8;
281  reading |= readByteFromFan2Click(num, addr+1);
282  return reading;
283}
284
285float  readInternalTempFan2Click(int num){
286  int reading = read2BytesFromFan2Click(num,  byte(FANCTRL_TEMPH_ADDR));
287  reading = reading>>5;
288  float Temperature = (float)reading/8;
289  return Temperature;
290}
291
292void setDirectPWMFan2Click(int num, byte pwm){
293  writeByteToFan2Click(num, byte(FANCTRL_DFCS_ADDR), pwm);
294}
295
296byte getCurrentPWMFan2Click(int  num){
297  byte pwm_current = readByteFromFan2Click(num, byte(FANCTRL_DFCS_ADDR));
298  return pwm_current;
299}
300
301float readTachometer(int num){
302  int reading  = read2BytesFromFan2Click(num, byte(FANCTRL_TACHH_ADDR));
303  float Tach = 6e6/(float)reading/2;  //division by 2 comes from number of tach pulses per revolution
304                                     //6e6  is the number of seconds in a minute times tach counter clock frequency
305  return  Tach;
306}
307
308void displayTach(int num, int i, int j){
309    //i,j - lcd cursor  indexes horisontal and vertical respectively,
310    //pwm - tach float value
311    float Tach = readTachometer(num);
312    lcd.setCursor(i, j);
313    if (Tach<1000){
314      lcd.print(" "); 
315    }
316    if (Tach<0){
317      lcd.print("  ");
318      Tach = 0;
319    }
320    lcd.print(Tach,0);
321}
322
323bool checkAndWriteByteToFan2Click(int  num, uint8_t addr, uint8_t val){
324  uint8_t val_read = readByteFromFan2Click(num,  addr);
325  bool rewritten = false;
326  if(val_read != val){
327    writeByteToFan2Click(num,  addr, val);
328    rewritten = true;
329  }
330  return rewritten;
331}
332
333void  configureFan2Click(int num){
334  int rewrittenSum = 0;
335  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,  byte(FANCTRL_CR1_ADDR),  byte(FANCTRL_CR1_VAL) );
336  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,  byte(FANCTRL_CR2_ADDR),  byte(FANCTRL_CR2_VAL) );
337  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,  byte(FANCTRL_CR3_ADDR),  byte(FANCTRL_CR3_VAL) );
338  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,  byte(FANCTRL_FFDC_ADDR), byte(FANCTRL_FFDC_VAL));
339  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,  byte(FANCTRL_AMR_ADDR),  byte(FANCTRL_AMR_VAL) );
340  /* DEBUGGING DISPLAY
341  lcd.setCursor(0, 0+(num-1)*2);
342  lcd.print("Fan Controller #"); 
343  lcd.print(num);
344  lcd.setCursor(0, 1+(num-1)*2);  
345  lcd.print(rewrittenSum);
346  lcd.print("  settings changed."); */
347}
348
349void changePWM(int num, float Temp, float TempSetPoint){
350    int pwm = getCurrentPWMFan2Click(num);
351
352    //COMPUTE DELTA PWM
353    int  deltaPWM = (Temp-TempSetPoint)*PWM_SLOPE;
354    if(deltaPWM>PWM_DELTA_MAX){
355      deltaPWM = PWM_DELTA_MAX;
356    }
357    else if(deltaPWM<-PWM_DELTA_MAX){
358      deltaPWM = -PWM_DELTA_MAX;
359    }
360
361    //CHANGE PWM BY PWM DELTA
362    pwm = pwm+deltaPWM;
363    if(pwm>FAN_PWM_MAX){
364      pwm=FAN_PWM_MAX;
365    }
366    else if(pwm<FAN_PWM_MIN){
367      pwm=FAN_PWM_MIN;
368    }
369    
370    setDirectPWMFan2Click(num, pwm);
371}
372
373void displayPWMChart(int num, int  i, int j){
374  int pwm = getCurrentPWMFan2Click(num);
375  int bars = (pwm+7)*18/255;  //18 is the total number of bars
376  int rest;
377  int divn;
378  char barChart[6]  = {0,0,0,0,0,0};
379  int k;
380  divn = bars/3;
381  rest = bars%3;
382  for (k=0;k<divn;k++){
383    barChart[k] = 3;
384  }
385  if(rest){
386    barChart[divn] = rest;
387  }
388  lcd.setCursor(i, j);
389//  lcd.print("F"); 
390//  lcd.print(num); 
391//  lcd.print(":  "); 
392  if (num==WATER_PUMP_CONTROL){
393    lcd.print("Pump");
394  }
395  else if(num==FANS_CONTROL){
396    lcd.print("Fans");
397  }
398  for(k=0;k<6;k++){
399    lcd.print(barChart[k]); 
400  }
401}
402
403
404///////////////////////
405///  OTHER FUNCTIONS ///
406///////////////////////
407
408
409void displayTemp(int i,  int j, float T, int n){
410    //i,j - lcd cursor indexes horisontal and vertical  respectively,
411    //T - temp, n - digits after decimal point
412    lcd.setCursor(i,  j);
413    if(T<10 && T>=0){
414      lcd.print("+"); 
415    }
416    if(T<-50.0){  // if there is no temp data for this one, I assigned a value of -100.
417      lcd.print(TempNoData);      
418    }
419    else{
420      lcd.print(T,n); 
421    }
422    lcd.print(degC);
423}
424
425void  getTemperatures(){
426  
427    T1 = 0;
428    T2 = 0;
429    T3 = 0;
430    AD5593R.write_DAC(0,vh);
431    int i;
432    for(i=1;i<N+1;i++){
433      v1 = AD5593R.read_ADC(1);
434      v2  = AD5593R.read_ADC(2);
435      v3 = AD5593R.read_ADC(3);
436      R2 = Rr*v2/(vh-v1);
437      R1 = Rr/(vh/v1-1)-R2;
438      R3 = 0.5*Rr/(vh/v3-1);
439      T1 = T1+(1/(A*log(R1)+B)-T0);
440      T2 = T2+(1/(A*log(R2)+B)-T0); 
441      T3 = T3+(1/(A*log(R3)+B)-T0);     
442    }
443    T1 = T1/N;
444    T2 = T2/N;
445    T3 = T3/N;
446    T4 = readInternalTempFan2Click(1);
447    AD5593R.write_DAC(0,0);
448    
449    if ( freshDataAvailable ){
450      TC  = .1*((inputString.charAt(1)-OFFS_CONV)+(inputString.charAt(0)-OFFS_CONV)*BASE_CONV);
451      TM = 1.0*(inputString.charAt(2)-OFFS_CONV);
452      miningMode = (inputString.charAt(3)  == 'Y');
453    }
454    else{
455      TC = -100.0; // values to indicate lack  of data in the function that prints temps on LCD
456      TM = -100.0;
457      miningMode  = true; 
458    }
459}
460
461void initializeI2CLCD(){
462  lcd.init();
463  lcd.clear();
464  lcd.createChar(0, barChars0);
465  lcd.createChar(1, barChars1);
466  lcd.createChar(2,  barChars2);
467  lcd.createChar(3, barChars3);
468  lcd.createChar(4, core);
469  lcd.createChar(5, vram);
470  lcd.createChar(6, loSign);
471  lcd.createChar(7,  hiSign);
472  backlightState = true;
473}
474
475void configureADCs(){
476    AD5593R.enable_internal_Vref();
477    AD5593R.set_DAC_max_1x_Vref();
478    AD5593R.set_ADC_max_1x_Vref();
479    AD5593R.configure_DACs(my_DACs);
480    AD5593R.configure_ADCs(my_ADCs);
481}
482
483void displayUpdate(){
484  lcd.setCursor(0,  0);
485  lcd.print(Thi);
486  displayTemp(1, 0, TEMP_WATER_H, 1);
487    
488  lcd.setCursor(0,  1);
489  lcd.print(Tlo);
490  displayTemp(1, 1, TEMP_WATER_L, 1);
491     
492  displayTemp(1,  2, TEMP_WATER_H - TEMP_WATER_L, 1);
493          
494  lcd.setCursor(0, 3);
495  lcd.print(char(127));
496  displayTemp(1, 3, TEMP_AIR_H, 1); 
497
498  lcd.setCursor(6,  0);
499  lcd.print(coreChar); 
500  displayTemp(7, 0, TC, 1); 
501  lcd.setCursor(6,  1);
502  lcd.print(vramChar); 
503  displayTemp(7, 1, TM, 1);
504    
505  lcd.setCursor(12,  0);
506  lcd.print("[Mode:");
507  lcd.print(modeChar[miningMode]);
508  lcd.print("]");
509
510  displayPWMChart(WATER_PUMP_CONTROL, 6, 2);
511  displayPWMChart(FANS_CONTROL,  6, 3);  
512    
513  lcd.setCursor(17, 1);
514  lcd.print("RPM");
515  displayTach(WATER_PUMP_CONTROL,  16, 2);
516  displayTach(FANS_CONTROL, 16, 3);
517}
518
519void trySerialRead(){
520  if ( Serial.available() ){
521    serialReadingBegins = millis();
522    while(Serial.read()!='  ' && (millis()-serialReadingBegins)<READ_TIMEOUT){
523      //Do nothing
524    }
525    inputStringBuffer = Serial.readStringUntil('\n');
526    if(inputStringBuffer.indexOf(char(0x09))!=-1){  //if string contains char 0x09 (tabulator)
527      backlightState = !backlightState;
528    }
529    if(inputStringBuffer.length()==4){
530      inputString = inputStringBuffer;
531      freshDataAvailable = true;
532    }
533  }
534}
535


/* I2C LCD with Arduino example code. More info: https://www.makerguides.com  */

// Include the libraries:
// LiquidCrystal_I2C.h: https://github.com/johnrickman/LiquidCrystal_I2C
#include  <Wire.h> // Library for I2C communication
#include <LiquidCrystal_I2C.h> // Library  for LCD
#include <AD5593R.h>
#include <math.h>

#define BAUD_RATE 115200
#define  LOOP_INTERVAL 1200 //ms

/* FAN CONTROL CONFIGURATION DEFINITIONS */
#define  FANCTRL_I2C_ADDR 0x50

#define FANCTRL_CR1_ADDR 0x00 //control register 1
#define  FANCTRL_CR1_VAL B10011000

#define FANCTRL_CR2_ADDR 0x01 //control register  2
#define FANCTRL_CR2_VAL B00010001

#define FANCTRL_CR3_ADDR 0x02 //control  register 3
#define FANCTRL_CR3_VAL B00110001

#define FANCTRL_FFDC_ADDR  0x03 //fan fail duty cycle
#define FANCTRL_FFDC_VAL 0xF2 // 95% duty cycle at  failure detected

#define FANCTRL_AMR_ADDR 0x04 //alert mask register
#define  FANCTRL_AMR_VAL B11111111 // ignore all alerts (for testing)

#define FANCTRL_DFCS_ADDR  0x50 //direct fan control PWM setting

#define FANCTRL_CPWM_ADDR 0x51 //current  pwm reading

#define FANCTRL_TACHH_ADDR 0x52 //high bits of tach
#define  FANCTRL_TACHL_ADDR 0x53 //low bits of tach

#define FANCTRL_TEMPH_ADDR 0x58  //high bits of temp
#define FANCTRL_TEMPL_ADDR 0x59 //low bits of temp

#define  FAN_PWM_MIN 72 //65 is ~25%
#define FAN_PWM_MAX 255//110// 110 is 43%
#define  PWM_DELTA_MAX 10 
#define PWM_SLOPE 5


#define TEMP_WATER_H T1
#define  TEMP_WATER_L T2
#define TEMP_AIR_H T3

#define WATER_PUMP_CONTROL 1
#define  FANS_CONTROL 2
#define TEMP_DIFF_TARGET 1.7 //-0.3//, target difference between  TH and TL
//#define TEMP_TARGET 34.0 //, target TL

#define BASE_CONV 94
#define  OFFS_CONV 33

#define READ_TIMEOUT 500

LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27,  20, 4);
AD5593R AD5593R(0x10); //ADC init

bool my_DACs[8] = {1,0,0,0,0,0,0,0};
bool  my_ADCs[8] = {0,1,1,1,0,0,0,0};
const int buttonPin = 2;

volatile bool  backlightState = 1;
volatile bool buttonPressed = 0;

float v1, v2, v3,  R1, R2, R3, T1, T2, T3, T4, TC, TM; // real variables: voltage, resistance and temperature
//const  char degC[3] = {4,'C',0}; // degC string for display
const char degC[3] = {223,0};  // degC string for display
const char Tlo[3] = {6,0}; // T_LO string for display
const  char Thi[3] = {7,0}; // T_HI string for display
const float TempTarget[2] = {45.0,40.0};//{40.0,25.0};//
const  char TempNoData[5] = "--.-";//{165,165,'.',165,0};
const char modeChar[2] =  {252,228};
const char coreChar = 4;
const char vramChar = 5;

const  float vh = 2.0;//4.5; //V, high voltage for resistance measurement bias
const  float T0 = 273.15; //K, temp equal 0
const float A = 2.5490E-4; //A parameter  for recalculation of resistance to temp
const float B = 1.0062E-3; //B parameter  for recalculation of resistance to temp
const float Rr = 20000.0;//19800.0;//  kOhm
const int N = 80; //averaging count
//int i;

unsigned long previousTime  = 0;
unsigned long currentTime = 0;
unsigned long prevButtonPress = 0;
unsigned  long nowButtonPress = 0;
unsigned long serialReadingBegins;

String inputString;
String  inputStringBuffer;
bool miningMode = true;
bool freshDataAvailable = false;


//  Custom char definitions
byte barChars0[8] = {
  B10101,
  B00000,
  B10101,
  B00000,
  B10101,
  B00000,
  B10101,
  B00000
};
byte barChars1[8]  = {
  B10101,
  B10000,
  B10101,
  B10000,
  B10101,
  B10000,
  B10101,
  B00000
};
byte barChars2[8] = {
  B10101,
  B10100,
  B10101,
  B10100,
  B10101,
  B10100,
  B10101,
  B00000
};
byte  barChars3[8] = {
  B10101,
  B10101,
  B10101,
  B10101,
  B10101,
  B10101,
  B10101,
  B00000
};

byte loSign[8] = {
  B00000,
  B11111,
  B10111,
  B10111,
  B10001,
  B11111,
  B00000,
  B00000
};
byte  hiSign[8] = {
  B00000,
  B11111,
  B10101,
  B10001,
  B10101,
  B11111,
  B00000,
  B00000
};
byte core[8] = {
  B11110,
  B11111,
  B11110,
  B11111,
  B11011,
  B11011,
  B11111,
  B11111
};
byte  vram[8] = {
  B11110,
  B11111,
  B11110,
  B11011,
  B10101,
  B10101,
  B11011,
  B11111
};

void setup() {
  initializeI2CLCD();
  //Serial setup
  Serial.begin(BAUD_RATE);
  Serial.setTimeout(100);

  //Interrupt for button to toggle LCD backlight
  pinMode(buttonPin, INPUT_PULLUP);
  attachInterrupt(0, pin_ISR, FALLING);
  
  // Setup fan controllers
  configureFan2Click(1);
  configureFan2Click(2);
  
  configureADCs();

  // Reserve memory for incoming strings form serial
  inputString.reserve(20);  
  inputStringBuffer.reserve(20);
}

void loop() {
  currentTime  = millis();

  //BACKLIGHT TOGGLE BUTTON CHECK W/ DEBOUNCER
  if ( buttonPressed  ){
    nowButtonPress = millis();
    if (nowButtonPress-prevButtonPress>50){
      prevButtonPress = nowButtonPress;
      backlightState = !backlightState;
      buttonPressed = 0;
    }
  }
  
  trySerialRead();

  //BACKLIGHT  SET
  if (backlightState){
    lcd.backlight();
  }
  else{
    lcd.noBacklight();
  }
  
  //MAIN ACITON
  if (currentTime - previousTime >= LOOP_INTERVAL)  {
    previousTime = currentTime; // save the last executed time

    getTemperatures();

    changePWM(WATER_PUMP_CONTROL, TEMP_WATER_H - TEMP_WATER_L, TEMP_DIFF_TARGET);
    changePWM(FANS_CONTROL, TEMP_WATER_L, TempTarget[miningMode]); //mining mode  bool chooses between the two array elements

    displayUpdate();

    freshDataAvailable = false; //set flag to await fresh data from serial
  }
}

void  pin_ISR() { //pin interrupt for button press
    buttonPressed = 1;
}

///////////////////////////////
///  FUNCTIONS FOR FAN2CLICK ///
///////////////////////////////

void writeByteToFan2Click(int  num, uint8_t addr, uint8_t value){
  //num - number of the fan controller, 1  or 2
  uint8_t i2cAddress = FANCTRL_I2C_ADDR+num-1;
  Wire.beginTransmission(i2cAddress);
  Wire.write(addr);
  Wire.write(value);
  Wire.endTransmission();  
}

uint8_t  readByteFromFan2Click(int num, uint8_t addr){
  //num - number of the fan controller,  1 or 2
  uint8_t i2cAddress = FANCTRL_I2C_ADDR+num-1;
  uint8_t reading =  0;
  Wire.beginTransmission(i2cAddress);
  Wire.write(addr);
  Wire.endTransmission();  
  Wire.requestFrom(i2cAddress, uint8_t(1));
  if (1 <= Wire.available())  { // if one byte was received
    reading = Wire.read();
  }
  return reading;
}

int  read2BytesFromFan2Click(int num, uint8_t addr){
  //num - number of the fan controller,  1 or 2
  int reading = readByteFromFan2Click(num, addr);
  reading = reading<<8;
  reading |= readByteFromFan2Click(num, addr+1);
  return reading;
}

float  readInternalTempFan2Click(int num){
  int reading = read2BytesFromFan2Click(num,  byte(FANCTRL_TEMPH_ADDR));
  reading = reading>>5;
  float Temperature = (float)reading/8;
  return Temperature;
}

void setDirectPWMFan2Click(int num, byte pwm){
  writeByteToFan2Click(num, byte(FANCTRL_DFCS_ADDR), pwm);
}

byte getCurrentPWMFan2Click(int  num){
  byte pwm_current = readByteFromFan2Click(num, byte(FANCTRL_DFCS_ADDR));
  return pwm_current;
}

float readTachometer(int num){
  int reading  = read2BytesFromFan2Click(num, byte(FANCTRL_TACHH_ADDR));
  float Tach = 6e6/(float)reading/2;  //division by 2 comes from number of tach pulses per revolution
                                     //6e6  is the number of seconds in a minute times tach counter clock frequency
  return  Tach;
}

void displayTach(int num, int i, int j){
    //i,j - lcd cursor  indexes horisontal and vertical respectively,
    //pwm - tach float value
    float Tach = readTachometer(num);
    lcd.setCursor(i, j);
    if (Tach<1000){
      lcd.print(" "); 
    }
    if (Tach<0){
      lcd.print("  ");
      Tach = 0;
    }
    lcd.print(Tach,0);
}

bool checkAndWriteByteToFan2Click(int  num, uint8_t addr, uint8_t val){
  uint8_t val_read = readByteFromFan2Click(num,  addr);
  bool rewritten = false;
  if(val_read != val){
    writeByteToFan2Click(num,  addr, val);
    rewritten = true;
  }
  return rewritten;
}

void  configureFan2Click(int num){
  int rewrittenSum = 0;
  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,  byte(FANCTRL_CR1_ADDR),  byte(FANCTRL_CR1_VAL) );
  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,  byte(FANCTRL_CR2_ADDR),  byte(FANCTRL_CR2_VAL) );
  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,  byte(FANCTRL_CR3_ADDR),  byte(FANCTRL_CR3_VAL) );
  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,  byte(FANCTRL_FFDC_ADDR), byte(FANCTRL_FFDC_VAL));
  rewrittenSum = rewrittenSum+checkAndWriteByteToFan2Click(num,  byte(FANCTRL_AMR_ADDR),  byte(FANCTRL_AMR_VAL) );
  /* DEBUGGING DISPLAY
  lcd.setCursor(0, 0+(num-1)*2);
  lcd.print("Fan Controller #"); 
  lcd.print(num);
  lcd.setCursor(0, 1+(num-1)*2);  
  lcd.print(rewrittenSum);
  lcd.print("  settings changed."); */
}

void changePWM(int num, float Temp, float TempSetPoint){
    int pwm = getCurrentPWMFan2Click(num);

    //COMPUTE DELTA PWM
    int  deltaPWM = (Temp-TempSetPoint)*PWM_SLOPE;
    if(deltaPWM>PWM_DELTA_MAX){
      deltaPWM = PWM_DELTA_MAX;
    }
    else if(deltaPWM<-PWM_DELTA_MAX){
      deltaPWM = -PWM_DELTA_MAX;
    }

    //CHANGE PWM BY PWM DELTA
    pwm = pwm+deltaPWM;
    if(pwm>FAN_PWM_MAX){
      pwm=FAN_PWM_MAX;
    }
    else if(pwm<FAN_PWM_MIN){
      pwm=FAN_PWM_MIN;
    }
    
    setDirectPWMFan2Click(num, pwm);
}

void displayPWMChart(int num, int  i, int j){
  int pwm = getCurrentPWMFan2Click(num);
  int bars = (pwm+7)*18/255;  //18 is the total number of bars
  int rest;
  int divn;
  char barChart[6]  = {0,0,0,0,0,0};
  int k;
  divn = bars/3;
  rest = bars%3;
  for (k=0;k<divn;k++){
    barChart[k] = 3;
  }
  if(rest){
    barChart[divn] = rest;
  }
  lcd.setCursor(i, j);
//  lcd.print("F"); 
//  lcd.print(num); 
//  lcd.print(":  "); 
  if (num==WATER_PUMP_CONTROL){
    lcd.print("Pump");
  }
  else if(num==FANS_CONTROL){
    lcd.print("Fans");
  }
  for(k=0;k<6;k++){
    lcd.print(barChart[k]); 
  }
}


///////////////////////
///  OTHER FUNCTIONS ///
///////////////////////


void displayTemp(int i,  int j, float T, int n){
    //i,j - lcd cursor indexes horisontal and vertical  respectively,
    //T - temp, n - digits after decimal point
    lcd.setCursor(i,  j);
    if(T<10 && T>=0){
      lcd.print("+"); 
    }
    if(T<-50.0){  // if there is no temp data for this one, I assigned a value of -100.
      lcd.print(TempNoData);      
    }
    else{
      lcd.print(T,n); 
    }
    lcd.print(degC);
}

void  getTemperatures(){
  
    T1 = 0;
    T2 = 0;
    T3 = 0;
    AD5593R.write_DAC(0,vh);
    int i;
    for(i=1;i<N+1;i++){
      v1 = AD5593R.read_ADC(1);
      v2  = AD5593R.read_ADC(2);
      v3 = AD5593R.read_ADC(3);
      R2 = Rr*v2/(vh-v1);
      R1 = Rr/(vh/v1-1)-R2;
      R3 = 0.5*Rr/(vh/v3-1);
      T1 = T1+(1/(A*log(R1)+B)-T0);
      T2 = T2+(1/(A*log(R2)+B)-T0); 
      T3 = T3+(1/(A*log(R3)+B)-T0);     
    }
    T1 = T1/N;
    T2 = T2/N;
    T3 = T3/N;
    T4 = readInternalTempFan2Click(1);
    AD5593R.write_DAC(0,0);
    
    if ( freshDataAvailable ){
      TC  = .1*((inputString.charAt(1)-OFFS_CONV)+(inputString.charAt(0)-OFFS_CONV)*BASE_CONV);
      TM = 1.0*(inputString.charAt(2)-OFFS_CONV);
      miningMode = (inputString.charAt(3)  == 'Y');
    }
    else{
      TC = -100.0; // values to indicate lack  of data in the function that prints temps on LCD
      TM = -100.0;
      miningMode  = true; 
    }
}

void initializeI2CLCD(){
  lcd.init();
  lcd.clear();
  lcd.createChar(0, barChars0);
  lcd.createChar(1, barChars1);
  lcd.createChar(2,  barChars2);
  lcd.createChar(3, barChars3);
  lcd.createChar(4, core);
  lcd.createChar(5, vram);
  lcd.createChar(6, loSign);
  lcd.createChar(7,  hiSign);
  backlightState = true;
}

void configureADCs(){
    AD5593R.enable_internal_Vref();
    AD5593R.set_DAC_max_1x_Vref();
    AD5593R.set_ADC_max_1x_Vref();
    AD5593R.configure_DACs(my_DACs);
    AD5593R.configure_ADCs(my_ADCs);
}

void displayUpdate(){
  lcd.setCursor(0,  0);
  lcd.print(Thi);
  displayTemp(1, 0, TEMP_WATER_H, 1);
    
  lcd.setCursor(0,  1);
  lcd.print(Tlo);
  displayTemp(1, 1, TEMP_WATER_L, 1);
     
  displayTemp(1,  2, TEMP_WATER_H - TEMP_WATER_L, 1);
          
  lcd.setCursor(0, 3);
  lcd.print(char(127));
  displayTemp(1, 3, TEMP_AIR_H, 1); 

  lcd.setCursor(6,  0);
  lcd.print(coreChar); 
  displayTemp(7, 0, TC, 1); 
  lcd.setCursor(6,  1);
  lcd.print(vramChar); 
  displayTemp(7, 1, TM, 1);
    
  lcd.setCursor(12,  0);
  lcd.print("[Mode:");
  lcd.print(modeChar[miningMode]);
  lcd.print("]");

  displayPWMChart(WATER_PUMP_CONTROL, 6, 2);
  displayPWMChart(FANS_CONTROL,  6, 3);  
    
  lcd.setCursor(17, 1);
  lcd.print("RPM");
  displayTach(WATER_PUMP_CONTROL,  16, 2);
  displayTach(FANS_CONTROL, 16, 3);
}

void trySerialRead(){
  if ( Serial.available() ){
    serialReadingBegins = millis();
    while(Serial.read()!='  ' && (millis()-serialReadingBegins)<READ_TIMEOUT){
      //Do nothing
    }
    inputStringBuffer = Serial.readStringUntil('\n');
    if(inputStringBuffer.indexOf(char(0x09))!=-1){  //if string contains char 0x09 (tabulator)
      backlightState = !backlightState;
    }
    if(inputStringBuffer.length()==4){
      inputString = inputStringBuffer;
      freshDataAvailable = true;
    }
  }
}

Python program to send GPU data to Arduino over Serial

python

1from pynvraw import api, NvError, get_phys_gpu
2import serial, time,
3  psutil
4
5def checkIfProcessRunning(processName):
6    '''
7    Check if
8  there is any running process that contains the given name processName.
9    '''
10
11    #Iterate over the all the running process
12    for proc in psutil.process_iter():
13
14        try:
15            # Check if process name contains the given name string.
16
17            if processName.lower() in proc.name().lower():
18                return
19  True
20        except (psutil.NoSuchProcess, psutil.AccessDenied, psutil.ZombieProcess):
21
22            pass
23    return False;
24
25def main():
26    cuda_dev = 0
27
28    ser = serial.Serial()
29    ser.baudrate = 115200
30    ser.timeout = 0.1
31
32    ser.writeTimeout = 0.1
33    ser.setDTR(False) #THIS IS IMPORTANT - prevents
34  Arduino from resetting
35    ser.port = 'COM8' #Put the COM number to which your
36  Arduino is connected
37    dataBeginsInt = 32 #this is a spacebar, data follows
38  the Space char.
39    dataBeginsChar = dataBeginsInt;
40    dataCharOffset = 33
41
42    outputString = " {}{}{}{}\
43"
44    base = 94; #base for encoding temperature
45  numbers
46    while True:
47        try:
48            gpu = get_phys_gpu(cuda_dev)
49
50        except ValueError:
51            break
52        try:
53            api.restore_coolers(gpu.handle)
54
55        except NvError as err:
56            if err.status != 'NVAPI_NOT_SUPPORTED':
57
58                raise
59        
60        cuda_dev += 1
61        
62    while
63  True:
64        try:
65            if checkIfProcessRunning('excavator'):
66
67                ExcavRunning = 'Y'
68            else:
69                ExcavRunning
70  = 'N'
71            gpuCoreTemp10xInt = int(gpu.core_temp*10);
72            coreTempCharEncodedByte2
73  = int(gpuCoreTemp10xInt%base+dataCharOffset) #least significant byte of the core
74  temp encoded
75            coreTempCharEncodedByte1 = int((gpuCoreTemp10xInt-coreTempCharEncodedByte2+dataCharOffset)/base+dataCharOffset)
76  #most significant byte of the core temp encoded
77            vramTempCharEncodedByte1
78  = int(gpu.vram_temp)+dataCharOffset
79            ser.open()
80            ser.write(outputString.format(chr(coreTempCharEncodedByte1),chr(coreTempCharEncodedByte2),chr(vramTempCharEncodedByte1),ExcavRunning).encode())
81
82            ser.close()
83            time.sleep(0.5)
84        except:
85            time.sleep(0.10
86  )
87            print('Port Busy\
88')
89        
90
91if __name__ == '__main__':
92
93    main()

from pynvraw import api, NvError, get_phys_gpu
import serial, time,
  psutil

def checkIfProcessRunning(processName):
    '''
    Check if
  there is any running process that contains the given name processName.
    '''

    #Iterate over the all the running process
    for proc in psutil.process_iter():

        try:
            # Check if process name contains the given name string.

            if processName.lower() in proc.name().lower():
                return
  True
        except (psutil.NoSuchProcess, psutil.AccessDenied, psutil.ZombieProcess):

            pass
    return False;

def main():
    cuda_dev = 0

    ser = serial.Serial()
    ser.baudrate = 115200
    ser.timeout = 0.1

    ser.writeTimeout = 0.1
    ser.setDTR(False) #THIS IS IMPORTANT - prevents
  Arduino from resetting
    ser.port = 'COM8' #Put the COM number to which your
  Arduino is connected
    dataBeginsInt = 32 #this is a spacebar, data follows
  the Space char.
    dataBeginsChar = dataBeginsInt;
    dataCharOffset = 33

    outputString = " {}{}{}{}\
"
    base = 94; #base for encoding temperature
  numbers
    while True:
        try:
            gpu = get_phys_gpu(cuda_dev)

        except ValueError:
            break
        try:
            api.restore_coolers(gpu.handle)

        except NvError as err:
            if err.status != 'NVAPI_NOT_SUPPORTED':

                raise
        
        cuda_dev += 1
        
    while
  True:
        try:
            if checkIfProcessRunning('excavator'):

                ExcavRunning = 'Y'
            else:
                ExcavRunning
  = 'N'
            gpuCoreTemp10xInt = int(gpu.core_temp*10);
            coreTempCharEncodedByte2
  = int(gpuCoreTemp10xInt%base+dataCharOffset) #least significant byte of the core
  temp encoded
            coreTempCharEncodedByte1 = int((gpuCoreTemp10xInt-coreTempCharEncodedByte2+dataCharOffset)/base+dataCharOffset)
  #most significant byte of the core temp encoded
            vramTempCharEncodedByte1
  = int(gpu.vram_temp)+dataCharOffset
            ser.open()
            ser.write(outputString.format(chr(coreTempCharEncodedByte1),chr(coreTempCharEncodedByte2),chr(vramTempCharEncodedByte1),ExcavRunning).encode())

            ser.close()
            time.sleep(0.5)
        except:
            time.sleep(0.10
  )
            print('Port Busy\
')
        

if __name__ == '__main__':

    main()

Downloadable files

Wiring diagram

Wiring diagram 2

Schematic I made and used to wire everything together on the actual 3D-printed board

Wiring diagram 2

Schematic I made and used to wire everything together on the actual 3D-printed board

Wiring diagram 2

Wiring diagram

Documentation

Enclosure Part 1

a simple brick to fit Arduino and the click boards

Enclosure Part 1

Case for I2C LCD - backside

Case for I2C LCD

It worked for my model; I don't guarantee it will work with yours

Case for I2C LCD

Enclosure part 2

Enclosure Part 1

a simple brick to fit Arduino and the click boards

Enclosure Part 1

Case for I2C LCD

It worked for my model; I don't guarantee it will work with yours

Case for I2C LCD

Case for I2C LCD - backside

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