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Car Sensor monitoring & Alarm

Monitor Oil Temp and Pressure, Water Temp, Voltage, Fuel level.\r\nDisplay on Nextion display or Nokia LCD

Sep 30, 2016

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42 respects

nextion

car

gauges

Components and supplies

52mm Triple Gauge Kit Oil Temp Water Temp Temperature Oil Pressure Car Meter

Nextion Enhanced NX4024K032 - Generic 3.2'' HMI Touch Display

Nokia 5110 LCD display $2

Arduino UNO

Oil Pressure/Temperature Temp Gauge Filter Sandwich Plate Sensor 1/8 NPT

Tools and machines

Soldering iron (generic)

Project description

Code

Nextion HMI code

properties

https://nextion.itead.cc/download.html

1inary file (no preview

inary file (no preview

Nextion HMI code

properties

https://nextion.itead.cc/download.html

1inary file (no preview

inary file (no preview

Arduino code for Nokia LCD display

arduino

84*48 LCD Module White Backlight Adapter PCB for Nokia 5110 Arduino

1#include "U8glib.h"
2
3#define backlight_pin 9
4int piezoPin =
5  8;  //8 digital pin the piezo buzzer is attached for alarm.
6const int oiltemppin
7  = A1;      //analog pin
8const int oilpressurepin = A2;  //oil spacer temp and
9  pressure
10const int watertemppin = A3;    // fitted in water hose after thermostat
11const
12  int voltpin = A4;         // from acc
13const int fuelpin = A5;         //from
14  dash fuel gauge
15;
16
17int TA = 130;     //OilTmp alarm level over 130
18float
19  OA = 1.5;   //OilPres alarm level under 1.5
20int WA = 100;     //WaterTmp alarm
21  level over 100
22float VA = 12.0;  //Volts alarm under 12.0v 
23float FA = 5;
24     //Fuel alarm under 10
25 
26U8GLIB_PCD8544 u8g(13,11, 7, 5, 6);  // CLK=13,
27  DIN=11, CE=7, DC=5, RST=6
28 
29void draw(void) {
30  float oiltempres = analogRead(oiltemppin);//resistance
31  value    (432.667-Resistance)/1.75
32  double oiltemp = (432.667 - oiltempres)
33  /1.80;// 50c=347ohm  60=324   70=312   80c=     95c=   110=   120=
34  
35  float
36  watertempres = analogRead(watertemppin);//resistance value   (350.124-Resistance)/1.25
37  
38  double watertemp = (350.124 - watertempres) /1.25;// 40c=297ohm   50=287   60=276
39   70=263   80=250  90=233 fan on
40
41  float oilpresres = analogRead(oilpressurepin);//
42  1=   2=   2.5=170  3=195  4=227  5=258 6=280  12.1v
43  float oilpressure = (98.5
44  - oilpresres) / -31.098; //
45    if  (oilpressure < 0) {oilpressure = 0;}
46
47  
48  float volts = analogRead(voltpin) / 65.0; //65
49  float fuel = analogRead(fuelpin)
50  / 2.0; 
51  
52  analogWrite(backlight_pin,20);  /* Set the Backlight intensity
53  */
54
55  u8g.setFont(u8g_font_profont11);  // select font
56  u8g.drawStr(0,
57  8, "OilTmp: ");    // put string of display at position X, Y
58  u8g.drawStr(0,
59  17, "OilPres: ");
60  u8g.drawStr(0, 26, "WtrTmp: ");
61  u8g.drawStr(0, 35,
62  "Volts: ");
63  u8g.drawStr(0, 44, "Fuel: ");
64  
65  u8g.setPrintPos(55,
66  8);  // set position
67  u8g.print(oiltemp, 0); 
68  u8g.drawStr(80, 8, "c ");
69
70  if (oiltemp > TA) {u8g.drawStr(50, 8, "# ");tone(piezoPin, 500,3000);analogWrite(backlight_pin,250);}
71  //tone(pin,freq,duration)
72    
73  u8g.setPrintPos(55, 17);
74  u8g.print(oilpressure,
75  1);  
76  u8g.drawStr(80, 17, "% ");
77  if ((oilpressure < OA)&(volts > 13.0))
78  {u8g.drawStr(50, 17, "# ");tone(piezoPin, 1000,3000);analogWrite(backlight_pin,250);}
79
80
81  u8g.setPrintPos(55, 26);
82  u8g.print(watertemp, 0); 
83  u8g.drawStr(80, 26,
84  "c ");
85  if (watertemp > WA) {u8g.drawStr(50, 26, "# ");tone(piezoPin, 1500,3000);analogWrite(backlight_pin,250);}
86
87
88  u8g.setPrintPos(55, 35);
89  u8g.print(volts, 1);  
90  u8g.drawStr(80, 35,
91  "v ");
92  if (volts < VA) {u8g.drawStr(50, 35, "# ");tone(piezoPin, 2500,3000);analogWrite(backlight_pin,250);}
93
94
95  u8g.setPrintPos(55, 44);
96  u8g.print(fuel, 0);  
97  u8g.drawStr(80, 44, "l
98  ");
99  if ((fuel < FA)& (oilpressure > 1)) {u8g.drawStr(50, 44, "# ");tone(piezoPin,
100  3000,1000);analogWrite(backlight_pin,250);}
101
102   //used for testing only
103
104    //u8g.setPrintPos(60, 44);
105  //u8g.print(fuel, 0);  
106    //u8g.setPrintPos(30,
107  44);
108  //u8g.print(oilpresres, 1);
109    //u8g.setPrintPos(5, 44);
110 // u8g.print(watertempres,
111  0);
112}
113 
114void setup(void) {
115 analogWrite(backlight_pin,20);  /* Set the
116  Backlight intensity */
117}
118 
119void loop(void) {
120 u8g.firstPage();  
121
122  do {
123    draw();
124  } while( u8g.nextPage() );
125  delay(1000);  // update
126  every 1000 = 1 sec
127}

#include "U8glib.h"

#define backlight_pin 9
int piezoPin =
  8;  //8 digital pin the piezo buzzer is attached for alarm.
const int oiltemppin
  = A1;      //analog pin
const int oilpressurepin = A2;  //oil spacer temp and
  pressure
const int watertemppin = A3;    // fitted in water hose after thermostat
const
  int voltpin = A4;         // from acc
const int fuelpin = A5;         //from
  dash fuel gauge
;

int TA = 130;     //OilTmp alarm level over 130
float
  OA = 1.5;   //OilPres alarm level under 1.5
int WA = 100;     //WaterTmp alarm
  level over 100
float VA = 12.0;  //Volts alarm under 12.0v 
float FA = 5;
     //Fuel alarm under 10
 
U8GLIB_PCD8544 u8g(13,11, 7, 5, 6);  // CLK=13,
  DIN=11, CE=7, DC=5, RST=6
 
void draw(void) {
  float oiltempres = analogRead(oiltemppin);//resistance
  value    (432.667-Resistance)/1.75
  double oiltemp = (432.667 - oiltempres)
  /1.80;// 50c=347ohm  60=324   70=312   80c=     95c=   110=   120=
  
  float
  watertempres = analogRead(watertemppin);//resistance value   (350.124-Resistance)/1.25
  
  double watertemp = (350.124 - watertempres) /1.25;// 40c=297ohm   50=287   60=276
   70=263   80=250  90=233 fan on

  float oilpresres = analogRead(oilpressurepin);//
  1=   2=   2.5=170  3=195  4=227  5=258 6=280  12.1v
  float oilpressure = (98.5
  - oilpresres) / -31.098; //
    if  (oilpressure < 0) {oilpressure = 0;}

  
  float volts = analogRead(voltpin) / 65.0; //65
  float fuel = analogRead(fuelpin)
  / 2.0; 
  
  analogWrite(backlight_pin,20);  /* Set the Backlight intensity
  */

  u8g.setFont(u8g_font_profont11);  // select font
  u8g.drawStr(0,
  8, "OilTmp: ");    // put string of display at position X, Y
  u8g.drawStr(0,
  17, "OilPres: ");
  u8g.drawStr(0, 26, "WtrTmp: ");
  u8g.drawStr(0, 35,
  "Volts: ");
  u8g.drawStr(0, 44, "Fuel: ");
  
  u8g.setPrintPos(55,
  8);  // set position
  u8g.print(oiltemp, 0); 
  u8g.drawStr(80, 8, "c ");

  if (oiltemp > TA) {u8g.drawStr(50, 8, "# ");tone(piezoPin, 500,3000);analogWrite(backlight_pin,250);}
  //tone(pin,freq,duration)
    
  u8g.setPrintPos(55, 17);
  u8g.print(oilpressure,
  1);  
  u8g.drawStr(80, 17, "% ");
  if ((oilpressure < OA)&(volts > 13.0))
  {u8g.drawStr(50, 17, "# ");tone(piezoPin, 1000,3000);analogWrite(backlight_pin,250);}


  u8g.setPrintPos(55, 26);
  u8g.print(watertemp, 0); 
  u8g.drawStr(80, 26,
  "c ");
  if (watertemp > WA) {u8g.drawStr(50, 26, "# ");tone(piezoPin, 1500,3000);analogWrite(backlight_pin,250);}


  u8g.setPrintPos(55, 35);
  u8g.print(volts, 1);  
  u8g.drawStr(80, 35,
  "v ");
  if (volts < VA) {u8g.drawStr(50, 35, "# ");tone(piezoPin, 2500,3000);analogWrite(backlight_pin,250);}


  u8g.setPrintPos(55, 44);
  u8g.print(fuel, 0);  
  u8g.drawStr(80, 44, "l
  ");
  if ((fuel < FA)& (oilpressure > 1)) {u8g.drawStr(50, 44, "# ");tone(piezoPin,
  3000,1000);analogWrite(backlight_pin,250);}

   //used for testing only

    //u8g.setPrintPos(60, 44);
  //u8g.print(fuel, 0);  
    //u8g.setPrintPos(30,
  44);
  //u8g.print(oilpresres, 1);
    //u8g.setPrintPos(5, 44);
 // u8g.print(watertempres,
  0);
}
 
void setup(void) {
 analogWrite(backlight_pin,20);  /* Set the
  Backlight intensity */
}
 
void loop(void) {
 u8g.firstPage();  

  do {
    draw();
  } while( u8g.nextPage() );
  delay(1000);  // update
  every 1000 = 1 sec
}

Arduino code for Nokia LCD display

arduino

84*48 LCD Module White Backlight Adapter PCB for Nokia 5110 Arduino

1#include "U8glib.h"
2
3#define backlight_pin 9
4int piezoPin =  8;  //8 digital pin the piezo buzzer is attached for alarm.
5const int oiltemppin  = A1;      //analog pin
6const int oilpressurepin = A2;  //oil spacer temp and  pressure
7const int watertemppin = A3;    // fitted in water hose after thermostat
8const  int voltpin = A4;         // from acc
9const int fuelpin = A5;         //from  dash fuel gauge
10;
11
12int TA = 130;     //OilTmp alarm level over 130
13float  OA = 1.5;   //OilPres alarm level under 1.5
14int WA = 100;     //WaterTmp alarm  level over 100
15float VA = 12.0;  //Volts alarm under 12.0v 
16float FA = 5;     //Fuel alarm under 10
17 
18U8GLIB_PCD8544 u8g(13,11, 7, 5, 6);  // CLK=13,  DIN=11, CE=7, DC=5, RST=6
19 
20void draw(void) {
21  float oiltempres = analogRead(oiltemppin);//resistance  value    (432.667-Resistance)/1.75
22  double oiltemp = (432.667 - oiltempres)  /1.80;// 50c=347ohm  60=324   70=312   80c=     95c=   110=   120=
23  
24  float  watertempres = analogRead(watertemppin);//resistance value   (350.124-Resistance)/1.25  
25  double watertemp = (350.124 - watertempres) /1.25;// 40c=297ohm   50=287   60=276   70=263   80=250  90=233 fan on
26
27  float oilpresres = analogRead(oilpressurepin);//  1=   2=   2.5=170  3=195  4=227  5=258 6=280  12.1v
28  float oilpressure = (98.5  - oilpresres) / -31.098; //
29    if  (oilpressure < 0) {oilpressure = 0;}
30  
31  float volts = analogRead(voltpin) / 65.0; //65
32  float fuel = analogRead(fuelpin)  / 2.0; 
33  
34  analogWrite(backlight_pin,20);  /* Set the Backlight intensity  */
35
36  u8g.setFont(u8g_font_profont11);  // select font
37  u8g.drawStr(0,  8, "OilTmp: ");    // put string of display at position X, Y
38  u8g.drawStr(0,  17, "OilPres: ");
39  u8g.drawStr(0, 26, "WtrTmp: ");
40  u8g.drawStr(0, 35,  "Volts: ");
41  u8g.drawStr(0, 44, "Fuel: ");
42  
43  u8g.setPrintPos(55,  8);  // set position
44  u8g.print(oiltemp, 0); 
45  u8g.drawStr(80, 8, "c ");
46  if (oiltemp > TA) {u8g.drawStr(50, 8, "# ");tone(piezoPin, 500,3000);analogWrite(backlight_pin,250);}  //tone(pin,freq,duration)
47    
48  u8g.setPrintPos(55, 17);
49  u8g.print(oilpressure,  1);  
50  u8g.drawStr(80, 17, "% ");
51  if ((oilpressure < OA)&(volts > 13.0))  {u8g.drawStr(50, 17, "# ");tone(piezoPin, 1000,3000);analogWrite(backlight_pin,250);}
52
53  u8g.setPrintPos(55, 26);
54  u8g.print(watertemp, 0); 
55  u8g.drawStr(80, 26,  "c ");
56  if (watertemp > WA) {u8g.drawStr(50, 26, "# ");tone(piezoPin, 1500,3000);analogWrite(backlight_pin,250);}
57
58  u8g.setPrintPos(55, 35);
59  u8g.print(volts, 1);  
60  u8g.drawStr(80, 35,  "v ");
61  if (volts < VA) {u8g.drawStr(50, 35, "# ");tone(piezoPin, 2500,3000);analogWrite(backlight_pin,250);}
62
63  u8g.setPrintPos(55, 44);
64  u8g.print(fuel, 0);  
65  u8g.drawStr(80, 44, "l  ");
66  if ((fuel < FA)& (oilpressure > 1)) {u8g.drawStr(50, 44, "# ");tone(piezoPin,  3000,1000);analogWrite(backlight_pin,250);}
67
68   //used for testing only
69    //u8g.setPrintPos(60, 44);
70  //u8g.print(fuel, 0);  
71    //u8g.setPrintPos(30,  44);
72  //u8g.print(oilpresres, 1);
73    //u8g.setPrintPos(5, 44);
74 // u8g.print(watertempres,  0);
75}
76 
77void setup(void) {
78 analogWrite(backlight_pin,20);  /* Set the  Backlight intensity */
79}
80 
81void loop(void) {
82 u8g.firstPage();  
83  do {
84    draw();
85  } while( u8g.nextPage() );
86  delay(1000);  // update  every 1000 = 1 sec
87}

#include "U8glib.h"

#define backlight_pin 9
int piezoPin =  8;  //8 digital pin the piezo buzzer is attached for alarm.
const int oiltemppin  = A1;      //analog pin
const int oilpressurepin = A2;  //oil spacer temp and  pressure
const int watertemppin = A3;    // fitted in water hose after thermostat
const  int voltpin = A4;         // from acc
const int fuelpin = A5;         //from  dash fuel gauge
;

int TA = 130;     //OilTmp alarm level over 130
float  OA = 1.5;   //OilPres alarm level under 1.5
int WA = 100;     //WaterTmp alarm  level over 100
float VA = 12.0;  //Volts alarm under 12.0v 
float FA = 5;     //Fuel alarm under 10
 
U8GLIB_PCD8544 u8g(13,11, 7, 5, 6);  // CLK=13,  DIN=11, CE=7, DC=5, RST=6
 
void draw(void) {
  float oiltempres = analogRead(oiltemppin);//resistance  value    (432.667-Resistance)/1.75
  double oiltemp = (432.667 - oiltempres)  /1.80;// 50c=347ohm  60=324   70=312   80c=     95c=   110=   120=
  
  float  watertempres = analogRead(watertemppin);//resistance value   (350.124-Resistance)/1.25  
  double watertemp = (350.124 - watertempres) /1.25;// 40c=297ohm   50=287   60=276   70=263   80=250  90=233 fan on

  float oilpresres = analogRead(oilpressurepin);//  1=   2=   2.5=170  3=195  4=227  5=258 6=280  12.1v
  float oilpressure = (98.5  - oilpresres) / -31.098; //
    if  (oilpressure < 0) {oilpressure = 0;}
  
  float volts = analogRead(voltpin) / 65.0; //65
  float fuel = analogRead(fuelpin)  / 2.0; 
  
  analogWrite(backlight_pin,20);  /* Set the Backlight intensity  */

  u8g.setFont(u8g_font_profont11);  // select font
  u8g.drawStr(0,  8, "OilTmp: ");    // put string of display at position X, Y
  u8g.drawStr(0,  17, "OilPres: ");
  u8g.drawStr(0, 26, "WtrTmp: ");
  u8g.drawStr(0, 35,  "Volts: ");
  u8g.drawStr(0, 44, "Fuel: ");
  
  u8g.setPrintPos(55,  8);  // set position
  u8g.print(oiltemp, 0); 
  u8g.drawStr(80, 8, "c ");
  if (oiltemp > TA) {u8g.drawStr(50, 8, "# ");tone(piezoPin, 500,3000);analogWrite(backlight_pin,250);}  //tone(pin,freq,duration)
    
  u8g.setPrintPos(55, 17);
  u8g.print(oilpressure,  1);  
  u8g.drawStr(80, 17, "% ");
  if ((oilpressure < OA)&(volts > 13.0))  {u8g.drawStr(50, 17, "# ");tone(piezoPin, 1000,3000);analogWrite(backlight_pin,250);}

  u8g.setPrintPos(55, 26);
  u8g.print(watertemp, 0); 
  u8g.drawStr(80, 26,  "c ");
  if (watertemp > WA) {u8g.drawStr(50, 26, "# ");tone(piezoPin, 1500,3000);analogWrite(backlight_pin,250);}

  u8g.setPrintPos(55, 35);
  u8g.print(volts, 1);  
  u8g.drawStr(80, 35,  "v ");
  if (volts < VA) {u8g.drawStr(50, 35, "# ");tone(piezoPin, 2500,3000);analogWrite(backlight_pin,250);}

  u8g.setPrintPos(55, 44);
  u8g.print(fuel, 0);  
  u8g.drawStr(80, 44, "l  ");
  if ((fuel < FA)& (oilpressure > 1)) {u8g.drawStr(50, 44, "# ");tone(piezoPin,  3000,1000);analogWrite(backlight_pin,250);}

   //used for testing only
    //u8g.setPrintPos(60, 44);
  //u8g.print(fuel, 0);  
    //u8g.setPrintPos(30,  44);
  //u8g.print(oilpresres, 1);
    //u8g.setPrintPos(5, 44);
 // u8g.print(watertempres,  0);
}
 
void setup(void) {
 analogWrite(backlight_pin,20);  /* Set the  Backlight intensity */
}
 
void loop(void) {
 u8g.firstPage();  
  do {
    draw();
  } while( u8g.nextPage() );
  delay(1000);  // update  every 1000 = 1 sec
}

MR2 Arduino code for Nextion display ver2

arduino

1#include "Nextion.h"
2
3NexGauge pointer1  = NexGauge(0, 3, "z0");        //(Page?,ID,"name")
4NexGauge pointer2  = NexGauge(0, 4, "z1");
5
6NexProgressBar  pb1 = NexProgressBar(0, 9, "pb1");   //volts page0
7NexProgressBar pb2 = NexProgressBar(0,  5, "pb2");   //oil pressure page0
8NexProgressBar pb3 = NexProgressBar(0, 10  , "pb3"); //Fuel page0
9
10NexProgressBar pb6 = NexProgressBar(2, 1, "pb6");//oil  pressure page2
11NexProgressBar pb7 = NexProgressBar(2, 2, "pb7");//oil temp  page2
12NexProgressBar pb8 = NexProgressBar(2, 3, "pb8");//water temp page2
13NexProgressBar  pb9 = NexProgressBar(2, 11, "pb9");//volts page2
14 
15NexText t6 = NexText(0,  7, "t6");      // oil pressure
16NexText t7 = NexText(0, 8, "t7");      //  oil temp
17NexText t8 = NexText(0, 9, "t8");      // water temp
18NexText t9  = NexText(0, 10, "t9");     // volts
19NexText t10 = NexText(0, 11, "t10");   //fuel
20NexText t11 = NexText(0, 12, "t11");   // min oil pressure
21NexText  t12 = NexText(0, 13, "t12");   // max oil pressure
22NexText t14 = NexText(0,  13, "t14");   //oiltemp max
23NexText t15 = NexText(0, 13, "t15");  //watertemp  max
24NexText t20 = NexText(1, 18, "t20");  //Alarm
25
26char ot[100] = {0};     //oiltemp
27char op[100] = {0};     //oilpress
28char wt[100] = {0};     //watertemp
29char  vo[100] = {0};     //volts
30char fu[100] = {0};     //fuel
31char opmax[100]  = {0};  //oilpressmax
32char opmin[100] ={0};   //oilpressmin
33char otmax[100]  = {0};  //oiltempmax
34char wtmax[100] = {0};  //watertempmax
35String alarm =  "";String alarm1 = "";String alarm2 = "";
36String alarm3 = "";String alarm4  = "";String alarm5 = "";
37String alarm6 = "";String alarm7 = "";int al=0;//  page 0 alarm @
38
39int piezoPin = 8;  //8 digital pin the piezo buzzer is attached  for alarm.
40const int oiltemppin = A0;      //analog pin
41const int oilpressurepin  = A1;  //oil spacer temp and pressure
42const int watertemppin = A2;    // fitted  in water hose after thermostat
43const int voltpin = A4;         // from acc
44const  int fuelpin = A5;         //from dash fuel gauge
45
46int TA = 150;      //OilTmp  alarm level over 130
47float OA = 1.0;    //OilPres alarm level under 1.5
48int  WA = 110;      //WaterTmp alarm level over 100
49float VA = 11.8;   //Volts alarm  under 12.0v 
50float FA = 10;      //Fuel alarm under 10
51
52float watertemp=30,watertempmax=20,v1,volts=10,fuel;
53float  oiltemp=30,oiltempmax=20,otr,oilTempRes=30,waterTempRes=30;
54float oilpressure,oilpressmax  = 0,oilpressmin = 10;
55
56boolean setComponentText(String component, String txt){
57    String componentText = component + ".txt=\\"" + txt + "\\"";//Set Component  text for float to txt
58    sendCommand(componentText.c_str());}
59
60void setup()  {    
61    nexInit();   
62}
63
64void loop() {
65calc();
66}
67
68void  calc(void) {
69 
70    const float filterCoeff = 0.3;
71    float rawvolts =  analogRead(voltpin) / 65.0; //65 
72    volts = volts + ((rawvolts - volts) * filterCoeff);
73    float voltcorrection = (14.2 - volts) * 1.5;//14.2 1.5
74 
75    float rawoilTempRes  = analogRead(oiltemppin);//resistance value *********************************OIL  TEMP****************************
76    oilTempRes = oilTempRes + ((rawoilTempRes  - oilTempRes) * filterCoeff);
77    
78    // 50c=347ohm  60=324   70=312   80c=     95c=   110=   120=   130
79    //test use only 24=450 30=420 40=400 50=360/840  60=774  70c = 751ohm  75=740  80c =730   95c=   65c=800  14.5 volts
80    //double  oiltemp = oilTempRes;  
81    //if (oilTempRes < 500) {oilTempRes = oilTempRes  * 2.3;}  
82           
83    double oiltemp = (525 - oilTempRes)/2.2 - voltcorrection;//Oil  y=1024+-3.5x  1.9 = 95  525 2.6
84    if (oiltempmax < oiltemp&&volts>13.5) {oiltempmax  = oiltemp;}//max oil temp
85    
86    float rawwaterTempRes = analogRead(watertemppin);//resistance  value  ***************************WATER TEMP*************************** 
87    waterTempRes  = waterTempRes + ((rawwaterTempRes - waterTempRes) * filterCoeff);
88    // to  test resistance value 24C=448  40c=437  50=428  60=405  65=380   70=367  75=360  80=355  82=317  85=315  90= 290  fan on  volts 14.5
89    //float watertemp =  waterTempRes;
90    
91    double watertemp = ((520 - waterTempRes)/3.1) - voltcorrection  ;//Water temp =(530-B8)/2.3 2.7 = 90 525/2.6
92    if  (watertempmax < watertemp&&volts>13.5)  {watertempmax = watertemp;}//max watertemp
93    
94  float oilpresres = analogRead(oilpressurepin);//  1=   2=   2.5=170  3=195  4=227  5=258 6=280  12.1v ************OIL PRESSURE*******
95  float oilpressure = (120.5 - oilpresres) / -31.098; //oilpressure = (120.5 - oilpresres)  / -31.098;
96    if  (oilpressmax < oilpressure) {oilpressmax = oilpressure;}//max  oil pressure
97    if  ((oilpressure >= 0)&&(oilpressmax > 3)&&(oilpressmin > oilpressure))  {oilpressmin = oilpressure;}//min oil pressure
98    if  (oilpressure <= 0) {oilpressure  = 0;}// when off and cold reads negative value this set to zero
99   
100  float  rawfuel = 100 - analogRead(fuelpin) / 3.6; //90 is half 60 is full
101  fuel = fuel  + ((rawfuel - fuel) * filterCoeff);
102
103 // Alarms last highest prority
104 alarm  = "      ";alarm1="      ";alarm2="      ";alarm3="      ";alarm4="      ";alarm5="  ";alarm6=" ";al=0;
105   if ((fuel < FA)& (oilpressure > 1)) {alarm = "Fuel  low";alarm6 ="LOW";}//tone(piezoPin, 3000,1000);}
106   if (volts < VA) {alarm  = "Battery volts low";alarm4 ="Alarm";}//tone(piezoPin, 2500,3000);al=1;}
107   if (oiltemp > TA) {alarm = "Oil Temp High";alarm2 ="Alarm"; tone(piezoPin,  1000,100);al=1;}//tone(pin,freq,duration)
108   if (watertemp > WA) {alarm = "Water  Temp High";alarm3 ="Alarm";tone(piezoPin, 3000,100);al=1;}
109   if ((oilpressure  < OA)&(volts > 13.4)) {alarm = "Oil Pressure Low";alarm1 ="Alarm";tone(piezoPin,  50,500);al=1;}
110   if (al>0){alarm5 = "Alarm";}
111
112     int poiltemp;//pointer  oiltemp gauge
113     poiltemp = oiltemp;
114     pointer1.setValue(poiltemp);
115     pointer2.setValue(watertemp);
116    
117   //int scaled_value = map(oilpressure,  act min value, act max value, 0, 100); // always map value from 0 to 100
118  
119    int vopb1 = map(v1, 10, 16, 0, 100);
120      pb1.setValue(vopb1);//volts page  0
121      
122    int oppb2 = map(oilpressure, 0, 7, 0, 100);//bar reads 0-100%
123      pb2.setValue(oppb2); //oil pressure p0  
124    
125    int fupb3 = map(fuel,  0, 100, 0, 100);
126      pb3.setValue(fupb3);//fuel p0
127   
128    int oppb6  = map(oilpressure, 0, 7, 0 , 100);
129      pb6.setValue(oppb6); // oil pressure  p2
130
131    int otpb7 = map(oiltemp, 0, 150, 0, 100);
132      pb7.setValue(otpb7);  // oiltemp p2 
133      
134    int otpb8 = map(watertemp, 0, 150, 0, 100);
135      pb8.setValue(otpb8); // water temp p2
136       
137    int vopb9 = map(v1,  10, 16, 0, 100);
138      pb9.setValue(vopb9);//volts page 2
139    
140    itoa(oilpressmin,opmin,10);
141    itoa(oilpressmax,opmax,10);
142    itoa(oiltemp,ot,10);
143    itoa(oiltempmax,otmax,10);
144    itoa(watertemp,wt,10);
145    itoa(watertempmax,wtmax,10);
146    itoa(fuel,fu,10  );
147    
148    setComponentText("t6", String(oilpressure).c_str());//gives  decimal places
149    t7.setText(ot); // oil temp p0,p1,p2
150    t8.setText(wt);  // water temp p0,p1,p2
151    setComponentText("t9", String(volts).c_str());
152    t10.setText(fu); // fuel % p0
153    t11.setText(opmin); //oilpressure max p1
154    t12.setText(opmax); //oilpressure min p1
155    t14.setText(otmax); //oiltemp  max p1
156    t15.setText(wtmax); //watertemp max p1
157    setComponentText("t20",  alarm);//alarm text variable
158    setComponentText("w1", alarm1);setComponentText("w2",  alarm2);setComponentText("w3", alarm3);
159    setComponentText("w4", alarm4);setComponentText("w5",  alarm5);setComponentText("w6", alarm6);
160}
161
162

#include "Nextion.h"

NexGauge pointer1  = NexGauge(0, 3, "z0");        //(Page?,ID,"name")
NexGauge pointer2  = NexGauge(0, 4, "z1");

NexProgressBar  pb1 = NexProgressBar(0, 9, "pb1");   //volts page0
NexProgressBar pb2 = NexProgressBar(0,  5, "pb2");   //oil pressure page0
NexProgressBar pb3 = NexProgressBar(0, 10  , "pb3"); //Fuel page0

NexProgressBar pb6 = NexProgressBar(2, 1, "pb6");//oil  pressure page2
NexProgressBar pb7 = NexProgressBar(2, 2, "pb7");//oil temp  page2
NexProgressBar pb8 = NexProgressBar(2, 3, "pb8");//water temp page2
NexProgressBar  pb9 = NexProgressBar(2, 11, "pb9");//volts page2
 
NexText t6 = NexText(0,  7, "t6");      // oil pressure
NexText t7 = NexText(0, 8, "t7");      //  oil temp
NexText t8 = NexText(0, 9, "t8");      // water temp
NexText t9  = NexText(0, 10, "t9");     // volts
NexText t10 = NexText(0, 11, "t10");   //fuel
NexText t11 = NexText(0, 12, "t11");   // min oil pressure
NexText  t12 = NexText(0, 13, "t12");   // max oil pressure
NexText t14 = NexText(0,  13, "t14");   //oiltemp max
NexText t15 = NexText(0, 13, "t15");  //watertemp  max
NexText t20 = NexText(1, 18, "t20");  //Alarm

char ot[100] = {0};     //oiltemp
char op[100] = {0};     //oilpress
char wt[100] = {0};     //watertemp
char  vo[100] = {0};     //volts
char fu[100] = {0};     //fuel
char opmax[100]  = {0};  //oilpressmax
char opmin[100] ={0};   //oilpressmin
char otmax[100]  = {0};  //oiltempmax
char wtmax[100] = {0};  //watertempmax
String alarm =  "";String alarm1 = "";String alarm2 = "";
String alarm3 = "";String alarm4  = "";String alarm5 = "";
String alarm6 = "";String alarm7 = "";int al=0;//  page 0 alarm @

int piezoPin = 8;  //8 digital pin the piezo buzzer is attached  for alarm.
const int oiltemppin = A0;      //analog pin
const int oilpressurepin  = A1;  //oil spacer temp and pressure
const int watertemppin = A2;    // fitted  in water hose after thermostat
const int voltpin = A4;         // from acc
const  int fuelpin = A5;         //from dash fuel gauge

int TA = 150;      //OilTmp  alarm level over 130
float OA = 1.0;    //OilPres alarm level under 1.5
int  WA = 110;      //WaterTmp alarm level over 100
float VA = 11.8;   //Volts alarm  under 12.0v 
float FA = 10;      //Fuel alarm under 10

float watertemp=30,watertempmax=20,v1,volts=10,fuel;
float  oiltemp=30,oiltempmax=20,otr,oilTempRes=30,waterTempRes=30;
float oilpressure,oilpressmax  = 0,oilpressmin = 10;

boolean setComponentText(String component, String txt){
    String componentText = component + ".txt=\\"" + txt + "\\"";//Set Component  text for float to txt
    sendCommand(componentText.c_str());}

void setup()  {    
    nexInit();   
}

void loop() {
calc();
}

void  calc(void) {
 
    const float filterCoeff = 0.3;
    float rawvolts =  analogRead(voltpin) / 65.0; //65 
    volts = volts + ((rawvolts - volts) * filterCoeff);
    float voltcorrection = (14.2 - volts) * 1.5;//14.2 1.5
 
    float rawoilTempRes  = analogRead(oiltemppin);//resistance value *********************************OIL  TEMP****************************
    oilTempRes = oilTempRes + ((rawoilTempRes  - oilTempRes) * filterCoeff);
    
    // 50c=347ohm  60=324   70=312   80c=     95c=   110=   120=   130
    //test use only 24=450 30=420 40=400 50=360/840  60=774  70c = 751ohm  75=740  80c =730   95c=   65c=800  14.5 volts
    //double  oiltemp = oilTempRes;  
    //if (oilTempRes < 500) {oilTempRes = oilTempRes  * 2.3;}  
           
    double oiltemp = (525 - oilTempRes)/2.2 - voltcorrection;//Oil  y=1024+-3.5x  1.9 = 95  525 2.6
    if (oiltempmax < oiltemp&&volts>13.5) {oiltempmax  = oiltemp;}//max oil temp
    
    float rawwaterTempRes = analogRead(watertemppin);//resistance  value  ***************************WATER TEMP*************************** 
    waterTempRes  = waterTempRes + ((rawwaterTempRes - waterTempRes) * filterCoeff);
    // to  test resistance value 24C=448  40c=437  50=428  60=405  65=380   70=367  75=360  80=355  82=317  85=315  90= 290  fan on  volts 14.5
    //float watertemp =  waterTempRes;
    
    double watertemp = ((520 - waterTempRes)/3.1) - voltcorrection  ;//Water temp =(530-B8)/2.3 2.7 = 90 525/2.6
    if  (watertempmax < watertemp&&volts>13.5)  {watertempmax = watertemp;}//max watertemp
    
  float oilpresres = analogRead(oilpressurepin);//  1=   2=   2.5=170  3=195  4=227  5=258 6=280  12.1v ************OIL PRESSURE*******
  float oilpressure = (120.5 - oilpresres) / -31.098; //oilpressure = (120.5 - oilpresres)  / -31.098;
    if  (oilpressmax < oilpressure) {oilpressmax = oilpressure;}//max  oil pressure
    if  ((oilpressure >= 0)&&(oilpressmax > 3)&&(oilpressmin > oilpressure))  {oilpressmin = oilpressure;}//min oil pressure
    if  (oilpressure <= 0) {oilpressure  = 0;}// when off and cold reads negative value this set to zero
   
  float  rawfuel = 100 - analogRead(fuelpin) / 3.6; //90 is half 60 is full
  fuel = fuel  + ((rawfuel - fuel) * filterCoeff);

 // Alarms last highest prority
 alarm  = "      ";alarm1="      ";alarm2="      ";alarm3="      ";alarm4="      ";alarm5="  ";alarm6=" ";al=0;
   if ((fuel < FA)& (oilpressure > 1)) {alarm = "Fuel  low";alarm6 ="LOW";}//tone(piezoPin, 3000,1000);}
   if (volts < VA) {alarm  = "Battery volts low";alarm4 ="Alarm";}//tone(piezoPin, 2500,3000);al=1;}
   if (oiltemp > TA) {alarm = "Oil Temp High";alarm2 ="Alarm"; tone(piezoPin,  1000,100);al=1;}//tone(pin,freq,duration)
   if (watertemp > WA) {alarm = "Water  Temp High";alarm3 ="Alarm";tone(piezoPin, 3000,100);al=1;}
   if ((oilpressure  < OA)&(volts > 13.4)) {alarm = "Oil Pressure Low";alarm1 ="Alarm";tone(piezoPin,  50,500);al=1;}
   if (al>0){alarm5 = "Alarm";}

     int poiltemp;//pointer  oiltemp gauge
     poiltemp = oiltemp;
     pointer1.setValue(poiltemp);
     pointer2.setValue(watertemp);
    
   //int scaled_value = map(oilpressure,  act min value, act max value, 0, 100); // always map value from 0 to 100
  
    int vopb1 = map(v1, 10, 16, 0, 100);
      pb1.setValue(vopb1);//volts page  0
      
    int oppb2 = map(oilpressure, 0, 7, 0, 100);//bar reads 0-100%
      pb2.setValue(oppb2); //oil pressure p0  
    
    int fupb3 = map(fuel,  0, 100, 0, 100);
      pb3.setValue(fupb3);//fuel p0
   
    int oppb6  = map(oilpressure, 0, 7, 0 , 100);
      pb6.setValue(oppb6); // oil pressure  p2

    int otpb7 = map(oiltemp, 0, 150, 0, 100);
      pb7.setValue(otpb7);  // oiltemp p2 
      
    int otpb8 = map(watertemp, 0, 150, 0, 100);
      pb8.setValue(otpb8); // water temp p2
       
    int vopb9 = map(v1,  10, 16, 0, 100);
      pb9.setValue(vopb9);//volts page 2
    
    itoa(oilpressmin,opmin,10);
    itoa(oilpressmax,opmax,10);
    itoa(oiltemp,ot,10);
    itoa(oiltempmax,otmax,10);
    itoa(watertemp,wt,10);
    itoa(watertempmax,wtmax,10);
    itoa(fuel,fu,10  );
    
    setComponentText("t6", String(oilpressure).c_str());//gives  decimal places
    t7.setText(ot); // oil temp p0,p1,p2
    t8.setText(wt);  // water temp p0,p1,p2
    setComponentText("t9", String(volts).c_str());
    t10.setText(fu); // fuel % p0
    t11.setText(opmin); //oilpressure max p1
    t12.setText(opmax); //oilpressure min p1
    t14.setText(otmax); //oiltemp  max p1
    t15.setText(wtmax); //watertemp max p1
    setComponentText("t20",  alarm);//alarm text variable
    setComponentText("w1", alarm1);setComponentText("w2",  alarm2);setComponentText("w3", alarm3);
    setComponentText("w4", alarm4);setComponentText("w5",  alarm5);setComponentText("w6", alarm6);
}

Downloadable files

Sketch of input board

Voltage divider to drop car 12-15v levels to arduino input 5v with zener protection for any voltage spikes.

Sketch of input board

Voltage divider to drop car 12-15v levels to arduino input 5v with zener protection for any voltage spikes.

Sketch of input board

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