Touchscreen Thermostat with Arduino MKR

How to make a good-looking touchscreen thermostat with optional Modbus support via RS485 with ArduiTouch MKR.

Mar 24, 2019

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home automation

internet of things

Components and supplies

Arduino MKR 485 Shield

Arduino MKR1000

ArduiTouch MKR

Project description

Code

ArduiTouch Modbus Thermostat

arduino

1/*
2 *  Application note: Thermostat with MODBUS via RS485 for ArduiTouch  MKR  
3 *  Version 1.0
4 *  Copyright (C) 2019  Hartmut Wendt  www.zihatec.de
5  *  
6 *  (based on sources of https://github.com/angeloc/simplemodbusng)
7 *  
8 *
9 *  This program is free software: you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License as published by
11 *  the  Free Software Foundation, either version 3 of the License, or
12 *  (at your option)  any later version.
13 *
14 *  This program is distributed in the hope that it  will be useful,
15 *  but WITHOUT ANY WARRANTY; without even the implied warranty  of
16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17 *  GNU  General Public License for more details.
18 *
19 *  You should have received a  copy of the GNU General Public License
20 *  along with this program.  If not,  see <http://www.gnu.org/licenses/>.
21*/   
22
23
24
25/*______Import Libraries_______*/
26#include  <Arduino.h>
27#include <SPI.h>
28#include "Adafruit_GFX.h"
29#include "Adafruit_ILI9341.h"
30#include  <XPT2046_Touchscreen.h>
31
32#include <Fonts/FreeSans9pt7b.h>
33#include <Fonts/FreeSansBold9pt7b.h>
34#include  <Fonts/FreeSansBold12pt7b.h>
35#include <Fonts/FreeSansBold24pt7b.h>
36#include  <SimpleModbusSlaveMKR.h> 
37#include "usergraphics.h"
38
39
40//#include <ArduinoRS485.h>
41//#include  <ArduinoModbus.h>
42/*______End of Libraries_______*/
43
44
45/*______Define  pins for ArduiTouch _______*/
46#define TFT_CS   A3
47#define TFT_DC   0
48#define  TFT_MOSI 8
49#define TFT_RST  22
50#define TFT_CLK  9
51#define TFT_MISO 10
52#define  TFT_LED  A2  
53
54
55#define HAVE_TOUCHPAD
56#define TOUCH_CS A4
57#define  TOUCH_IRQ 1
58
59/*_______End of definitions______*/
60
61
62/*______Define  sound for SAMD21 based boards _______*/
63#define SND_PIN 2 // sound pin
64
65
66/*_______End  of Sound definitions______*/
67
68
69/*______Assign pressure_______*/
70#define  ILI9341_ULTRA_DARKGREY    0x632C      
71#define MINPRESSURE 10
72#define MAXPRESSURE  2000
73/*_______Assigned______*/
74
75/*____Calibrate TFT LCD_____*/
76#define  TS_MINX 370
77#define TS_MINY 470
78#define TS_MAXX 3700
79#define TS_MAXY 3600
80/*______End  of Calibration______*/
81
82
83/*____Modbus_____*/
84#define BAUDRATE 9600
85#define  DEFAULT_ID 1
86enum 
87{     
88  // just add or remove registers 
89  // The  first register starts at address 0
90  ROOM_TEMP,  // measured room temp from external  sensor
91  SET_TEMP,   // set-point temperature by user, 
92  FAN_LEVEL,  // level  for ventilation (values 0 - 5)
93  BEEPER,     // any value between 400 and 4000  will set the beeper with the given frequency for 100ms
94  DISP_ONOFF, // timer  for display automatic off function (0 switch backlight off, >0 set timer for automatic  off)
95  TOTAL_ERRORS,
96  // leave this one
97  TOTAL_REGS_SIZE 
98  // total  number of registers for function 3 and 16 share the same register array
99}; 
100/*______End  of Modbus______*/
101
102
103/*____Program specific constants_____*/
104#define  MAX_TEMPERATURE 28  
105#define MIN_TEMPERATURE 18
106enum { PM_MAIN, PM_OPTION,  PM_CLEANING};  // Program modes
107enum { BOOT, COOLING, TEMP_OK, HEATING};        //  Thermostat modes
108/*______End of specific constants______*/
109
110
111Adafruit_ILI9341  tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);
112XPT2046_Touchscreen touch(TOUCH_CS,  TOUCH_IRQ);
113
114//define _debug
115 int X,Y;
116 uint8_t Thermostat_mode =  BOOT;
117 
118 uint8_t iFan_level = 0;
119 uint8_t iRoom_temperature = 21;
120 uint8_t  iSet_temperature = 20;
121
122 uint8_t PMode = PM_MAIN;         // program mode
123  uint8_t Modbus_ID = DEFAULT_ID;  // ID / address for modbus
124 bool Touch_pressed  = false;
125 uint8_t Timer_Cleaning=0;
126 
127 unsigned int holdingRegs[TOTAL_REGS_SIZE];  // function 3 and 16 register array 
128
129
130 
131
132void setup() {
133  #ifdef  _debug
134  Serial.begin(9600); 
135  #endif
136
137  // Init MODBUS registers
138  holdingRegs[ROOM_TEMP] = iRoom_temperature;
139  holdingRegs[SET_TEMP] = iSet_temperature;
140  holdingRegs[ROOM_TEMP] = iFan_level;
141  holdingRegs[BEEPER] = 0;
142  holdingRegs[DISP_ONOFF]  = 3000;
143  
144  #ifndef _debug 
145  /* parameters(long baudrate, 
146                unsigned  char ID, 
147                bool HalfDuplexEnable, 
148                unsigned  int holding registers size,
149                unsigned char low latency)
150                
151     For RS485 (half duplex) set the HalfDuplexEnable to true, 
152     for RS422  (full duplex) set the HalfDuplexEnable to false     
153     Low latency delays  makes the implementation non-standard
154     but practically it works with all  major modbus master implementations.
155  */
156  modbus_configure(BAUDRATE, Modbus_ID,  true, TOTAL_REGS_SIZE, 0); 
157  #endif
158
159  
160  touch.begin();
161  tft.begin();
162  #ifdef _debug
163  Serial.print("tftx ="); Serial.print(tft.width()); Serial.print("  tfty ="); Serial.println(tft.height());
164  #endif
165
166  draw_main_screen();
167  pinMode(TFT_LED, OUTPUT);
168  digitalWrite(TFT_LED, LOW);    // HIGH to Turn  on;
169
170
171}
172
173
174TS_Point p;
175
176void loop() {
177 
178  if (Touch_Event()==  true) { 
179    X = p.y; Y = p.x;    
180    
181      if (Touch_pressed == false)  {
182      if (holdingRegs[DISP_ONOFF]) DetectButtons();
183      holdingRegs[DISP_ONOFF]  = 3000; // reset BL timer       
184    }
185    Touch_pressed = true;
186    
187  } else {
188    Touch_pressed = false;
189  }
190
191  
192
193  //automatic display  BL timeout
194  if (holdingRegs[DISP_ONOFF]) {
195    holdingRegs[DISP_ONOFF]--;
196    digitalWrite(TFT_LED, LOW); // Backlight off 
197  } else {
198    digitalWrite(TFT_LED,  HIGH); // Backlight on
199  }
200
201  // screen cleaning
202  Cleaning_processing();
203  
204  // Modbus
205  Modbus_processing(); 
206  delay(10);
207  
208}
209
210
211/********************************************************************//**
212  * @brief     detects a touch event and converts touch data 
213 * @param[in] None
214  * @return    boolean (true = touch pressed, false = touch unpressed) 
215 *********************************************************************/
216bool  Touch_Event() {
217  if (touch.tirqTouched()) {
218    if (touch.touched()) {   
219      p = touch.getPoint(); 
220      delay(1);
221      p.x = map(p.x, TS_MINX,  TS_MAXX, 0, 320);
222      p.y = map(p.y, TS_MINY, TS_MAXY, 240, 0);
223      if  (p.z > MINPRESSURE) return true;  
224    }
225  } 
226  return false;  
227}
228
229
230
231
232/********************************************************************//**
233  * @brief     Processing for screen cleaning function
234 * @param[in] None
235 *  @return    None
236 *********************************************************************/
237void  Cleaning_processing()
238{
239  // idle timer for screen cleaning
240  if (PMode  == PM_CLEANING) {
241      if ((Timer_Cleaning % 10) == 0) {
242        tft.fillRect(0,0,  100, 60, ILI9341_BLACK);
243        tft.setCursor(10, 50);
244        tft.print(Timer_Cleaning  / 10);
245        
246      }
247      if (Timer_Cleaning) {
248        Timer_Cleaning--;
249      } else {
250        draw_option_screen();
251        PMode = PM_OPTION;
252      }
253  }  
254}
255
256
257/********************************************************************//**
258  * @brief     Processing for MODBUS function / checking all registers
259 * @param[in]  None
260 * @return    None
261 *********************************************************************/
262void  Modbus_processing()
263{
264  holdingRegs[TOTAL_ERRORS] = modbus_update(holdingRegs);  
265
266  // update of variables by Modbus
267  if (holdingRegs[ROOM_TEMP] != iRoom_temperature)  {
268     if ((holdingRegs[ROOM_TEMP] > 50) || (holdingRegs[ROOM_TEMP] < 5)) {
269       holdingRegs[ROOM_TEMP] = iRoom_temperature;
270     } else {
271       iRoom_temperature  = holdingRegs[ROOM_TEMP];
272       update_Room_temp();
273       update_circle_color();
274     }
275  }
276
277  if (holdingRegs[SET_TEMP] != iSet_temperature) {
278     if  ((holdingRegs[SET_TEMP] > MAX_TEMPERATURE) || (holdingRegs[SET_TEMP] < MIN_TEMPERATURE))  {
279       holdingRegs[SET_TEMP] = iSet_temperature;
280     } else {
281       iSet_temperature  = holdingRegs[SET_TEMP];
282       update_SET_temp();
283       update_circle_color();
284     }
285  }
286
287
288  if (holdingRegs[FAN_LEVEL] != iFan_level) {
289     if  ((holdingRegs[FAN_LEVEL] > 5) || (holdingRegs[FAN_LEVEL] < 0)) {
290       holdingRegs[FAN_LEVEL]  = iFan_level;
291     } else {
292       iFan_level = holdingRegs[FAN_LEVEL];
293       draw_fan_level(50,312,iFan_level);
294     }
295  }
296
297  if ((holdingRegs[BEEPER]  > 500) && (holdingRegs[BEEPER] < 4000)) {
298    tone(SND_PIN,holdingRegs[BEEPER],100);
299  } 
300  holdingRegs[BEEPER] = 0;    
301  
302}
303
304
305/********************************************************************//**
306  * @brief     detecting pressed buttons with the given touchscreen values
307 * @param[in]  None
308 * @return    None
309 *********************************************************************/
310void  DetectButtons()
311{
312  // in main program
313  if (PMode == PM_MAIN){
314
315   // button UP
316   if ((X>190) && (Y<50)) {
317    if (iSet_temperature < MAX_TEMPERATURE)  iSet_temperature++;
318    tone(SND_PIN,2000,100);
319    holdingRegs[SET_TEMP]  = iSet_temperature;
320    update_SET_temp();
321    update_circle_color();
322   }
323    
324   // button DWN
325   if ((X>190) && (Y>200 && Y<250)) {
326    if  (iSet_temperature > MIN_TEMPERATURE) iSet_temperature--;
327    tone(SND_PIN,2000,100);
328    holdingRegs[SET_TEMP] = iSet_temperature;
329    update_SET_temp();
330    update_circle_color();
331   }
332
333   // button FAN MAX
334   if ((X>180) && (Y>270)) {
335    tone(SND_PIN,2000,100);
336    if (iFan_level < 5) iFan_level++;
337    draw_fan_level(50,312,iFan_level);
338    holdingRegs[FAN_LEVEL] = iFan_level;
339   }
340
341   // button FAN MIN
342   if ((X<60) && (Y>270)) {
343    tone(SND_PIN,2000,100);
344    if (iFan_level  > 0) iFan_level--;
345    draw_fan_level(50,312,iFan_level);
346    holdingRegs[FAN_LEVEL]  = iFan_level;
347   }
348
349   // button gearwheel
350   if ((X<60) && (Y<50))  {
351    draw_option_screen();
352    PMode = PM_OPTION;
353   }
354
355 
356  }  else if (PMode == PM_OPTION){ 
357
358   // button -
359   if ((X<110) && (Y<75))  {
360    if (Modbus_ID > 0) Modbus_ID--;
361    update_Modbus_addr();
362   }
363
364   // button +
365   if ((X>130) && (Y<75)) {
366    if (Modbus_ID < 255) Modbus_ID++;
367    update_Modbus_addr();
368   }
369   
370   // button screen cleaning
371   if  ((Y>85) && (Y<155)) {
372     tft.fillScreen(ILI9341_BLACK);
373     tft.setTextColor(ILI9341_WHITE,  ILI9341_BLACK);
374     tft.setFont(&FreeSansBold24pt7b);  
375     PMode = PM_CLEANING;    
376     Timer_Cleaning = 255;
377   }
378
379
380   // button OK
381   if (Y>265)  {
382     Thermostat_mode = BOOT;
383     draw_main_screen();
384     modbus_configure(BAUDRATE,  Modbus_ID, 0, TOTAL_REGS_SIZE, 0);      
385     PMode = PM_MAIN;    
386   }
387    
388    
389  }
390}
391
392
393
394/********************************************************************//**
395  * @brief     Drawing of the main program screen
396 * @param[in] None
397 * @return    None
398 *********************************************************************/
399void  draw_main_screen()
400{
401  tft.fillScreen(ILI9341_BLACK);
402  
403  // draw circles
404  update_circle_color();
405
406  // draw temperature up/dwn buttons
407  draw_up_down_button();
408
409  // draw icons
410  tft.drawRGBBitmap(10,290, fan_blue_24,24,24);
411  tft.drawRGBBitmap(200,282,  fan_blue_32,32,32);
412  tft.drawRGBBitmap(10,10, wrench, 24,24);  
413  
414  //  draw default fan level
415  draw_fan_level(50,312,iFan_level);
416
417  update_SET_temp();
418  
419}
420
421
422
423/********************************************************************//**
424  * @brief     Drawing of the screen for Options menu
425 * @param[in] None
426 *  @return    None
427 *********************************************************************/
428void  draw_option_screen()
429{
430  tft.fillScreen(ILI9341_BLACK);
431
432  tft.setTextColor(ILI9341_WHITE,  ILI9341_BLACK);
433  tft.setFont(&FreeSansBold9pt7b);  
434  
435  // Modbus Address  adjustment
436  tft.setCursor(10, 20);
437  tft.print("MODBUS address");
438  tft.setFont(&FreeSansBold24pt7b);
439  tft.setCursor(30, 65);
440  tft.print("-");
441  tft.setCursor(190, 65);
442  tft.print("+");
443  tft.drawLine(5,80,235,80, ILI9341_WHITE);
444
445  // Screen  cleaning idle timer
446  tft.setFont(&FreeSansBold12pt7b);  
447  tft.setCursor(26,  130);
448  tft.print("Screen cleaning");
449  tft.drawLine(5,160,235,160, ILI9341_WHITE);
450
451  // OK Button
452  tft.setFont(&FreeSansBold24pt7b);
453  tft.drawLine(5,260,235,260,  ILI9341_WHITE);
454  tft.setCursor(90, 310);
455  tft.print("OK");  
456  update_Modbus_addr();
457  
458}
459
460
461/********************************************************************//**
462  * @brief     update of the value for set temperature on the screen
463 *            (in  the big colored circle)
464 * @param[in] None
465 * @return    None
466 *********************************************************************/
467void  update_SET_temp()
468{
469  int16_t x1, y1;
470  uint16_t w, h;
471  String curValue  = String(iSet_temperature);
472  int str_len =  curValue.length() + 1; 
473  char  char_array[str_len];
474  curValue.toCharArray(char_array, str_len);
475  tft.fillRect(70,  96, 60, 50, ILI9341_BLACK);
476  tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
477  tft.setFont(&FreeSansBold24pt7b);
478  tft.getTextBounds(char_array, 80, 130,  &x1, &y1, &w, &h);
479  tft.setCursor(123 - w, 130);
480  tft.print(char_array);
481}
482
483
484
485/********************************************************************//**
486  * @brief     update of the value for room temperature on the screen
487 *            (in  the small grey circle)
488 * @param[in] None
489 * @return    None
490 *********************************************************************/
491void  update_Room_temp()
492{
493  int16_t x1, y1;
494  uint16_t w, h;
495  String curValue  = String(iRoom_temperature);
496  int str_len =  curValue.length() + 1; 
497  char  char_array[str_len];
498  curValue.toCharArray(char_array, str_len);
499  tft.fillRect(36,  200, 30, 21, ILI9341_ULTRA_DARKGREY);
500  tft.setTextColor(ILI9341_WHITE, ILI9341_ULTRA_DARKGREY);
501  tft.setFont(&FreeSansBold12pt7b);
502  tft.getTextBounds(char_array, 40, 220,  &x1, &y1, &w, &h);
503  tft.setCursor(61 - w, 220);
504  tft.print(char_array);
505}
506
507
508
509/********************************************************************//**
510  * @brief     update of the color of the big circle according the 
511 *            difference  between set and room temperature 
512 * @param[in] None
513 * @return    None
514  *********************************************************************/
515void update_circle_color()
516{
517  // HEATING 
518  if ((iRoom_temperature < iSet_temperature) && (Thermostat_mode  != HEATING)) {
519    Thermostat_mode = HEATING;
520    draw_circles();
521  }
522
523  // COOLING 
524  if ((iRoom_temperature > iSet_temperature) && (Thermostat_mode  != COOLING)) {
525    Thermostat_mode = COOLING;
526    draw_circles();
527  }
528
529  // Temperature ok 
530  if ((iRoom_temperature == iSet_temperature) && (Thermostat_mode  != TEMP_OK)) {
531    Thermostat_mode = TEMP_OK;
532    draw_circles();
533  }
534}
535
536
537/********************************************************************//**
538  * @brief     update of the value for MODBUS ID in the options menu on  
539 *            the  screen
540 * @param[in] None
541 * @return    None
542 *********************************************************************/
543void  update_Modbus_addr()
544{
545  tft.fillRect(110, 30, 60, 45, ILI9341_BLACK);
546  tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
547  tft.setFont(&FreeSansBold24pt7b);
548  tft.setCursor(115, 65);
549  tft.print(Modbus_ID);
550}
551
552
553
554/********************************************************************//**
555  * @brief     drawing of the circles in main screen including the value 
556 *            of  room temperature
557 * @param[in] None
558 * @return    None
559 *********************************************************************/
560void  draw_circles()
561{
562
563  //draw big circle 
564  unsigned char i;
565  if (iRoom_temperature  < iSet_temperature) {
566    // heating - red
567    for(i=0; i < 10; i++) tft.drawCircle(120,  120, 80 + i, ILI9341_RED);
568  } else if (iRoom_temperature > iSet_temperature)  {
569    // cooling - blue
570    for(i=0; i < 10; i++) tft.drawCircle(120, 120,  80 + i, ILI9341_BLUE);    
571  } else {
572    // Temperature ok
573    for(i=0;  i < 10; i++) tft.drawCircle(120, 120, 80 + i, ILI9341_GREEN);       
574  }
575
576  //draw small 
577  tft.fillCircle(60, 200, 40, ILI9341_ULTRA_DARKGREY);
578
579  //draw °C in big circle
580  tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
581  tft.setFont(&FreeSansBold9pt7b);
582  tft.setCursor(130, 100);
583  tft.print("o");
584  tft.setFont(&FreeSansBold24pt7b);
585  tft.setCursor(140, 130);
586  tft.print("C");
587
588  // draw room and °C in small circle
589  tft.setTextColor(ILI9341_WHITE, ILI9341_ULTRA_DARKGREY);
590  tft.setFont(&FreeSansBold12pt7b);
591  tft.setCursor(75, 220);
592  tft.print("C");
593  tft.drawCircle(69,204, 2, ILI9341_WHITE);
594  tft.drawCircle(69,204, 3, ILI9341_WHITE);
595  tft.setFont(&FreeSansBold9pt7b);
596  tft.setCursor(35, 190);
597  tft.print("Room");
598  update_Room_temp();
599
600}
601
602
603
604/********************************************************************//**
605  * @brief     drawing of the both buttons for setting temperature up 
606 *            and  down
607 * @param[in] None
608 * @return    None
609 *********************************************************************/
610void  draw_up_down_button()
611{
612  //up button 
613  tft.fillTriangle(215,10,230,30,200,30,  ILI9341_WHITE);
614    
615  //down button
616  tft.fillTriangle(215,230,230,210,200,210,  ILI9341_WHITE);
617}
618
619
620
621/********************************************************************//**
622  * @brief     drawing of the fan level in main screen
623 * @param[in] None
624 *  @return    None
625 *********************************************************************/
626void  draw_fan_level(uint16_t x0, uint16_t y0,  uint8_t ilevel)
627{
628  unsigned char  i;
629  if (ilevel >= 5)  ilevel = 5;
630  for(i=0; i < 5; i++) {
631    if (i <  ilevel)  {
632      tft.fillRect(x0 + (30*i), y0- 10 -(i*8), 20, 10 + (i*8), ILI9341_WHITE);  
633    } else {
634      tft.fillRect(x0 + (30*i), y0- 10 -(i*8), 20, 10 + (i*8),  ILI9341_BLACK);
635      tft.drawRect(x0 + (30*i), y0- 10 -(i*8), 20, 10 + (i*8),  ILI9341_WHITE); 
636      
637    }
638  }
639}
640

/*
 *  Application note: Thermostat with MODBUS via RS485 for ArduiTouch  MKR  
 *  Version 1.0
 *  Copyright (C) 2019  Hartmut Wendt  www.zihatec.de
  *  
 *  (based on sources of https://github.com/angeloc/simplemodbusng)
 *  
 *
 *  This program is free software: you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
 *  the  Free Software Foundation, either version 3 of the License, or
 *  (at your option)  any later version.
 *
 *  This program is distributed in the hope that it  will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty  of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU  General Public License for more details.
 *
 *  You should have received a  copy of the GNU General Public License
 *  along with this program.  If not,  see <http://www.gnu.org/licenses/>.
*/   



/*______Import Libraries_______*/
#include  <Arduino.h>
#include <SPI.h>
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"
#include  <XPT2046_Touchscreen.h>

#include <Fonts/FreeSans9pt7b.h>
#include <Fonts/FreeSansBold9pt7b.h>
#include  <Fonts/FreeSansBold12pt7b.h>
#include <Fonts/FreeSansBold24pt7b.h>
#include  <SimpleModbusSlaveMKR.h> 
#include "usergraphics.h"


//#include <ArduinoRS485.h>
//#include  <ArduinoModbus.h>
/*______End of Libraries_______*/


/*______Define  pins for ArduiTouch _______*/
#define TFT_CS   A3
#define TFT_DC   0
#define  TFT_MOSI 8
#define TFT_RST  22
#define TFT_CLK  9
#define TFT_MISO 10
#define  TFT_LED  A2  


#define HAVE_TOUCHPAD
#define TOUCH_CS A4
#define  TOUCH_IRQ 1

/*_______End of definitions______*/


/*______Define  sound for SAMD21 based boards _______*/
#define SND_PIN 2 // sound pin


/*_______End  of Sound definitions______*/


/*______Assign pressure_______*/
#define  ILI9341_ULTRA_DARKGREY    0x632C      
#define MINPRESSURE 10
#define MAXPRESSURE  2000
/*_______Assigned______*/

/*____Calibrate TFT LCD_____*/
#define  TS_MINX 370
#define TS_MINY 470
#define TS_MAXX 3700
#define TS_MAXY 3600
/*______End  of Calibration______*/


/*____Modbus_____*/
#define BAUDRATE 9600
#define  DEFAULT_ID 1
enum 
{     
  // just add or remove registers 
  // The  first register starts at address 0
  ROOM_TEMP,  // measured room temp from external  sensor
  SET_TEMP,   // set-point temperature by user, 
  FAN_LEVEL,  // level  for ventilation (values 0 - 5)
  BEEPER,     // any value between 400 and 4000  will set the beeper with the given frequency for 100ms
  DISP_ONOFF, // timer  for display automatic off function (0 switch backlight off, >0 set timer for automatic  off)
  TOTAL_ERRORS,
  // leave this one
  TOTAL_REGS_SIZE 
  // total  number of registers for function 3 and 16 share the same register array
}; 
/*______End  of Modbus______*/


/*____Program specific constants_____*/
#define  MAX_TEMPERATURE 28  
#define MIN_TEMPERATURE 18
enum { PM_MAIN, PM_OPTION,  PM_CLEANING};  // Program modes
enum { BOOT, COOLING, TEMP_OK, HEATING};        //  Thermostat modes
/*______End of specific constants______*/


Adafruit_ILI9341  tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);
XPT2046_Touchscreen touch(TOUCH_CS,  TOUCH_IRQ);

//define _debug
 int X,Y;
 uint8_t Thermostat_mode =  BOOT;
 
 uint8_t iFan_level = 0;
 uint8_t iRoom_temperature = 21;
 uint8_t  iSet_temperature = 20;

 uint8_t PMode = PM_MAIN;         // program mode
  uint8_t Modbus_ID = DEFAULT_ID;  // ID / address for modbus
 bool Touch_pressed  = false;
 uint8_t Timer_Cleaning=0;
 
 unsigned int holdingRegs[TOTAL_REGS_SIZE];  // function 3 and 16 register array 


 

void setup() {
  #ifdef  _debug
  Serial.begin(9600); 
  #endif

  // Init MODBUS registers
  holdingRegs[ROOM_TEMP] = iRoom_temperature;
  holdingRegs[SET_TEMP] = iSet_temperature;
  holdingRegs[ROOM_TEMP] = iFan_level;
  holdingRegs[BEEPER] = 0;
  holdingRegs[DISP_ONOFF]  = 3000;
  
  #ifndef _debug 
  /* parameters(long baudrate, 
                unsigned  char ID, 
                bool HalfDuplexEnable, 
                unsigned  int holding registers size,
                unsigned char low latency)
                
     For RS485 (half duplex) set the HalfDuplexEnable to true, 
     for RS422  (full duplex) set the HalfDuplexEnable to false     
     Low latency delays  makes the implementation non-standard
     but practically it works with all  major modbus master implementations.
  */
  modbus_configure(BAUDRATE, Modbus_ID,  true, TOTAL_REGS_SIZE, 0); 
  #endif

  
  touch.begin();
  tft.begin();
  #ifdef _debug
  Serial.print("tftx ="); Serial.print(tft.width()); Serial.print("  tfty ="); Serial.println(tft.height());
  #endif

  draw_main_screen();
  pinMode(TFT_LED, OUTPUT);
  digitalWrite(TFT_LED, LOW);    // HIGH to Turn  on;


}


TS_Point p;

void loop() {
 
  if (Touch_Event()==  true) { 
    X = p.y; Y = p.x;    
    
      if (Touch_pressed == false)  {
      if (holdingRegs[DISP_ONOFF]) DetectButtons();
      holdingRegs[DISP_ONOFF]  = 3000; // reset BL timer       
    }
    Touch_pressed = true;
    
  } else {
    Touch_pressed = false;
  }

  

  //automatic display  BL timeout
  if (holdingRegs[DISP_ONOFF]) {
    holdingRegs[DISP_ONOFF]--;
    digitalWrite(TFT_LED, LOW); // Backlight off 
  } else {
    digitalWrite(TFT_LED,  HIGH); // Backlight on
  }

  // screen cleaning
  Cleaning_processing();
  
  // Modbus
  Modbus_processing(); 
  delay(10);
  
}


/********************************************************************//**
  * @brief     detects a touch event and converts touch data 
 * @param[in] None
  * @return    boolean (true = touch pressed, false = touch unpressed) 
 *********************************************************************/
bool  Touch_Event() {
  if (touch.tirqTouched()) {
    if (touch.touched()) {   
      p = touch.getPoint(); 
      delay(1);
      p.x = map(p.x, TS_MINX,  TS_MAXX, 0, 320);
      p.y = map(p.y, TS_MINY, TS_MAXY, 240, 0);
      if  (p.z > MINPRESSURE) return true;  
    }
  } 
  return false;  
}




/********************************************************************//**
  * @brief     Processing for screen cleaning function
 * @param[in] None
 *  @return    None
 *********************************************************************/
void  Cleaning_processing()
{
  // idle timer for screen cleaning
  if (PMode  == PM_CLEANING) {
      if ((Timer_Cleaning % 10) == 0) {
        tft.fillRect(0,0,  100, 60, ILI9341_BLACK);
        tft.setCursor(10, 50);
        tft.print(Timer_Cleaning  / 10);
        
      }
      if (Timer_Cleaning) {
        Timer_Cleaning--;
      } else {
        draw_option_screen();
        PMode = PM_OPTION;
      }
  }  
}


/********************************************************************//**
  * @brief     Processing for MODBUS function / checking all registers
 * @param[in]  None
 * @return    None
 *********************************************************************/
void  Modbus_processing()
{
  holdingRegs[TOTAL_ERRORS] = modbus_update(holdingRegs);  

  // update of variables by Modbus
  if (holdingRegs[ROOM_TEMP] != iRoom_temperature)  {
     if ((holdingRegs[ROOM_TEMP] > 50) || (holdingRegs[ROOM_TEMP] < 5)) {
       holdingRegs[ROOM_TEMP] = iRoom_temperature;
     } else {
       iRoom_temperature  = holdingRegs[ROOM_TEMP];
       update_Room_temp();
       update_circle_color();
     }
  }

  if (holdingRegs[SET_TEMP] != iSet_temperature) {
     if  ((holdingRegs[SET_TEMP] > MAX_TEMPERATURE) || (holdingRegs[SET_TEMP] < MIN_TEMPERATURE))  {
       holdingRegs[SET_TEMP] = iSet_temperature;
     } else {
       iSet_temperature  = holdingRegs[SET_TEMP];
       update_SET_temp();
       update_circle_color();
     }
  }


  if (holdingRegs[FAN_LEVEL] != iFan_level) {
     if  ((holdingRegs[FAN_LEVEL] > 5) || (holdingRegs[FAN_LEVEL] < 0)) {
       holdingRegs[FAN_LEVEL]  = iFan_level;
     } else {
       iFan_level = holdingRegs[FAN_LEVEL];
       draw_fan_level(50,312,iFan_level);
     }
  }

  if ((holdingRegs[BEEPER]  > 500) && (holdingRegs[BEEPER] < 4000)) {
    tone(SND_PIN,holdingRegs[BEEPER],100);
  } 
  holdingRegs[BEEPER] = 0;    
  
}


/********************************************************************//**
  * @brief     detecting pressed buttons with the given touchscreen values
 * @param[in]  None
 * @return    None
 *********************************************************************/
void  DetectButtons()
{
  // in main program
  if (PMode == PM_MAIN){

   // button UP
   if ((X>190) && (Y<50)) {
    if (iSet_temperature < MAX_TEMPERATURE)  iSet_temperature++;
    tone(SND_PIN,2000,100);
    holdingRegs[SET_TEMP]  = iSet_temperature;
    update_SET_temp();
    update_circle_color();
   }
    
   // button DWN
   if ((X>190) && (Y>200 && Y<250)) {
    if  (iSet_temperature > MIN_TEMPERATURE) iSet_temperature--;
    tone(SND_PIN,2000,100);
    holdingRegs[SET_TEMP] = iSet_temperature;
    update_SET_temp();
    update_circle_color();
   }

   // button FAN MAX
   if ((X>180) && (Y>270)) {
    tone(SND_PIN,2000,100);
    if (iFan_level < 5) iFan_level++;
    draw_fan_level(50,312,iFan_level);
    holdingRegs[FAN_LEVEL] = iFan_level;
   }

   // button FAN MIN
   if ((X<60) && (Y>270)) {
    tone(SND_PIN,2000,100);
    if (iFan_level  > 0) iFan_level--;
    draw_fan_level(50,312,iFan_level);
    holdingRegs[FAN_LEVEL]  = iFan_level;
   }

   // button gearwheel
   if ((X<60) && (Y<50))  {
    draw_option_screen();
    PMode = PM_OPTION;
   }

 
  }  else if (PMode == PM_OPTION){ 

   // button -
   if ((X<110) && (Y<75))  {
    if (Modbus_ID > 0) Modbus_ID--;
    update_Modbus_addr();
   }

   // button +
   if ((X>130) && (Y<75)) {
    if (Modbus_ID < 255) Modbus_ID++;
    update_Modbus_addr();
   }
   
   // button screen cleaning
   if  ((Y>85) && (Y<155)) {
     tft.fillScreen(ILI9341_BLACK);
     tft.setTextColor(ILI9341_WHITE,  ILI9341_BLACK);
     tft.setFont(&FreeSansBold24pt7b);  
     PMode = PM_CLEANING;    
     Timer_Cleaning = 255;
   }


   // button OK
   if (Y>265)  {
     Thermostat_mode = BOOT;
     draw_main_screen();
     modbus_configure(BAUDRATE,  Modbus_ID, 0, TOTAL_REGS_SIZE, 0);      
     PMode = PM_MAIN;    
   }
    
    
  }
}



/********************************************************************//**
  * @brief     Drawing of the main program screen
 * @param[in] None
 * @return    None
 *********************************************************************/
void  draw_main_screen()
{
  tft.fillScreen(ILI9341_BLACK);
  
  // draw circles
  update_circle_color();

  // draw temperature up/dwn buttons
  draw_up_down_button();

  // draw icons
  tft.drawRGBBitmap(10,290, fan_blue_24,24,24);
  tft.drawRGBBitmap(200,282,  fan_blue_32,32,32);
  tft.drawRGBBitmap(10,10, wrench, 24,24);  
  
  //  draw default fan level
  draw_fan_level(50,312,iFan_level);

  update_SET_temp();
  
}



/********************************************************************//**
  * @brief     Drawing of the screen for Options menu
 * @param[in] None
 *  @return    None
 *********************************************************************/
void  draw_option_screen()
{
  tft.fillScreen(ILI9341_BLACK);

  tft.setTextColor(ILI9341_WHITE,  ILI9341_BLACK);
  tft.setFont(&FreeSansBold9pt7b);  
  
  // Modbus Address  adjustment
  tft.setCursor(10, 20);
  tft.print("MODBUS address");
  tft.setFont(&FreeSansBold24pt7b);
  tft.setCursor(30, 65);
  tft.print("-");
  tft.setCursor(190, 65);
  tft.print("+");
  tft.drawLine(5,80,235,80, ILI9341_WHITE);

  // Screen  cleaning idle timer
  tft.setFont(&FreeSansBold12pt7b);  
  tft.setCursor(26,  130);
  tft.print("Screen cleaning");
  tft.drawLine(5,160,235,160, ILI9341_WHITE);

  // OK Button
  tft.setFont(&FreeSansBold24pt7b);
  tft.drawLine(5,260,235,260,  ILI9341_WHITE);
  tft.setCursor(90, 310);
  tft.print("OK");  
  update_Modbus_addr();
  
}


/********************************************************************//**
  * @brief     update of the value for set temperature on the screen
 *            (in  the big colored circle)
 * @param[in] None
 * @return    None
 *********************************************************************/
void  update_SET_temp()
{
  int16_t x1, y1;
  uint16_t w, h;
  String curValue  = String(iSet_temperature);
  int str_len =  curValue.length() + 1; 
  char  char_array[str_len];
  curValue.toCharArray(char_array, str_len);
  tft.fillRect(70,  96, 60, 50, ILI9341_BLACK);
  tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
  tft.setFont(&FreeSansBold24pt7b);
  tft.getTextBounds(char_array, 80, 130,  &x1, &y1, &w, &h);
  tft.setCursor(123 - w, 130);
  tft.print(char_array);
}



/********************************************************************//**
  * @brief     update of the value for room temperature on the screen
 *            (in  the small grey circle)
 * @param[in] None
 * @return    None
 *********************************************************************/
void  update_Room_temp()
{
  int16_t x1, y1;
  uint16_t w, h;
  String curValue  = String(iRoom_temperature);
  int str_len =  curValue.length() + 1; 
  char  char_array[str_len];
  curValue.toCharArray(char_array, str_len);
  tft.fillRect(36,  200, 30, 21, ILI9341_ULTRA_DARKGREY);
  tft.setTextColor(ILI9341_WHITE, ILI9341_ULTRA_DARKGREY);
  tft.setFont(&FreeSansBold12pt7b);
  tft.getTextBounds(char_array, 40, 220,  &x1, &y1, &w, &h);
  tft.setCursor(61 - w, 220);
  tft.print(char_array);
}



/********************************************************************//**
  * @brief     update of the color of the big circle according the 
 *            difference  between set and room temperature 
 * @param[in] None
 * @return    None
  *********************************************************************/
void update_circle_color()
{
  // HEATING 
  if ((iRoom_temperature < iSet_temperature) && (Thermostat_mode  != HEATING)) {
    Thermostat_mode = HEATING;
    draw_circles();
  }

  // COOLING 
  if ((iRoom_temperature > iSet_temperature) && (Thermostat_mode  != COOLING)) {
    Thermostat_mode = COOLING;
    draw_circles();
  }

  // Temperature ok 
  if ((iRoom_temperature == iSet_temperature) && (Thermostat_mode  != TEMP_OK)) {
    Thermostat_mode = TEMP_OK;
    draw_circles();
  }
}


/********************************************************************//**
  * @brief     update of the value for MODBUS ID in the options menu on  
 *            the  screen
 * @param[in] None
 * @return    None
 *********************************************************************/
void  update_Modbus_addr()
{
  tft.fillRect(110, 30, 60, 45, ILI9341_BLACK);
  tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
  tft.setFont(&FreeSansBold24pt7b);
  tft.setCursor(115, 65);
  tft.print(Modbus_ID);
}



/********************************************************************//**
  * @brief     drawing of the circles in main screen including the value 
 *            of  room temperature
 * @param[in] None
 * @return    None
 *********************************************************************/
void  draw_circles()
{

  //draw big circle 
  unsigned char i;
  if (iRoom_temperature  < iSet_temperature) {
    // heating - red
    for(i=0; i < 10; i++) tft.drawCircle(120,  120, 80 + i, ILI9341_RED);
  } else if (iRoom_temperature > iSet_temperature)  {
    // cooling - blue
    for(i=0; i < 10; i++) tft.drawCircle(120, 120,  80 + i, ILI9341_BLUE);    
  } else {
    // Temperature ok
    for(i=0;  i < 10; i++) tft.drawCircle(120, 120, 80 + i, ILI9341_GREEN);       
  }

  //draw small 
  tft.fillCircle(60, 200, 40, ILI9341_ULTRA_DARKGREY);

  //draw °C in big circle
  tft.setTextColor(ILI9341_WHITE, ILI9341_BLACK);
  tft.setFont(&FreeSansBold9pt7b);
  tft.setCursor(130, 100);
  tft.print("o");
  tft.setFont(&FreeSansBold24pt7b);
  tft.setCursor(140, 130);
  tft.print("C");

  // draw room and °C in small circle
  tft.setTextColor(ILI9341_WHITE, ILI9341_ULTRA_DARKGREY);
  tft.setFont(&FreeSansBold12pt7b);
  tft.setCursor(75, 220);
  tft.print("C");
  tft.drawCircle(69,204, 2, ILI9341_WHITE);
  tft.drawCircle(69,204, 3, ILI9341_WHITE);
  tft.setFont(&FreeSansBold9pt7b);
  tft.setCursor(35, 190);
  tft.print("Room");
  update_Room_temp();

}



/********************************************************************//**
  * @brief     drawing of the both buttons for setting temperature up 
 *            and  down
 * @param[in] None
 * @return    None
 *********************************************************************/
void  draw_up_down_button()
{
  //up button 
  tft.fillTriangle(215,10,230,30,200,30,  ILI9341_WHITE);
    
  //down button
  tft.fillTriangle(215,230,230,210,200,210,  ILI9341_WHITE);
}



/********************************************************************//**
  * @brief     drawing of the fan level in main screen
 * @param[in] None
 *  @return    None
 *********************************************************************/
void  draw_fan_level(uint16_t x0, uint16_t y0,  uint8_t ilevel)
{
  unsigned char  i;
  if (ilevel >= 5)  ilevel = 5;
  for(i=0; i < 5; i++) {
    if (i <  ilevel)  {
      tft.fillRect(x0 + (30*i), y0- 10 -(i*8), 20, 10 + (i*8), ILI9341_WHITE);  
    } else {
      tft.fillRect(x0 + (30*i), y0- 10 -(i*8), 20, 10 + (i*8),  ILI9341_BLACK);
      tft.drawRect(x0 + (30*i), y0- 10 -(i*8), 20, 10 + (i*8),  ILI9341_WHITE); 
      
    }
  }
}

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