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edited Jun 17, 2020 at 8:21

Community Bot

edited Jun 17, 2020 at 8:21

Community Bot

schematic

^{simulate this circuit – Schematic created using CircuitLab}

This is the code that I'm using to get the temperature:

#define COEFF_A 0.8662984364E-03
#define COEFF_B 2.780704551E-04
#define COEFF_C -0.9395108479E-07
float VRT, Temp;
float Vref = 2.52;
void setup() {
 Serial.begin(9600);
 analogReference(EXTERNAL);
}
void loop() {
 long Resistance;
 VRT = analogRead(A3);
 Resistance = 10000 / ((1023.0 / VRT) - 1);
 Temp = log(Resistance);
 Temp = 1 / (COEFF_A + (COEFF_B * Temp) + (COEFF_C * pow(Temp, 3)));
 Temp += -273.15;
 Serial.println(Temp);
 delay(500);
}

I know that the calculation should be: V = Vref ×ばつ VRT ÷ 1023 but i don't know how to implant it in this code, any help appreciated.

#Update

Update

After Edgar Bonet answer, the edited code is:

#define COEFF_A 0.8662984364E-03
#define COEFF_B 2.780704551E-04
#define COEFF_C -0.9395108479E-07
float VRT, Temp, VR;
void setup() {
 Serial.begin(9600);
 analogReference(EXTERNAL);
}
void loop() {
 long Resistance;
 VRT = analogRead(A3);
 VR = 2.52 * VRT / 1024;
 Resistance = 10000 * VR / (2.52 - VR);
 Temp = log(Resistance);
 Temp = 1 / (COEFF_A + (COEFF_B * Temp) + (COEFF_C * pow(Temp, 3)));
 Temp += -273.15;
 Serial.println(Temp);
 delay(500);
}

But the temperature reading is 2 centigrade less than what it should be, when i remove the analogReference(EXTERNAL); it shows the normal/correct temperature readings.

schematic

^{simulate this circuit – Schematic created using CircuitLab}

This is the code that I'm using to get the temperature:

#define COEFF_A 0.8662984364E-03
#define COEFF_B 2.780704551E-04
#define COEFF_C -0.9395108479E-07
float VRT, Temp;
float Vref = 2.52;
void setup() {
 Serial.begin(9600);
 analogReference(EXTERNAL);
}
void loop() {
 long Resistance;
 VRT = analogRead(A3);
 Resistance = 10000 / ((1023.0 / VRT) - 1);
 Temp = log(Resistance);
 Temp = 1 / (COEFF_A + (COEFF_B * Temp) + (COEFF_C * pow(Temp, 3)));
 Temp += -273.15;
 Serial.println(Temp);
 delay(500);
}

I know that the calculation should be: V = Vref ×ばつ VRT ÷ 1023 but i don't know how to implant it in this code, any help appreciated.

#Update

After Edgar Bonet answer, the edited code is:

#define COEFF_A 0.8662984364E-03
#define COEFF_B 2.780704551E-04
#define COEFF_C -0.9395108479E-07
float VRT, Temp, VR;
void setup() {
 Serial.begin(9600);
 analogReference(EXTERNAL);
}
void loop() {
 long Resistance;
 VRT = analogRead(A3);
 VR = 2.52 * VRT / 1024;
 Resistance = 10000 * VR / (2.52 - VR);
 Temp = log(Resistance);
 Temp = 1 / (COEFF_A + (COEFF_B * Temp) + (COEFF_C * pow(Temp, 3)));
 Temp += -273.15;
 Serial.println(Temp);
 delay(500);
}

But the temperature reading is 2 centigrade less than what it should be, when i remove the analogReference(EXTERNAL); it shows the normal/correct temperature readings.

schematic

^{simulate this circuit – Schematic created using CircuitLab}

This is the code that I'm using to get the temperature:

#define COEFF_A 0.8662984364E-03
#define COEFF_B 2.780704551E-04
#define COEFF_C -0.9395108479E-07
float VRT, Temp;
float Vref = 2.52;
void setup() {
 Serial.begin(9600);
 analogReference(EXTERNAL);
}
void loop() {
 long Resistance;
 VRT = analogRead(A3);
 Resistance = 10000 / ((1023.0 / VRT) - 1);
 Temp = log(Resistance);
 Temp = 1 / (COEFF_A + (COEFF_B * Temp) + (COEFF_C * pow(Temp, 3)));
 Temp += -273.15;
 Serial.println(Temp);
 delay(500);
}

I know that the calculation should be: V = Vref ×ばつ VRT ÷ 1023 but i don't know how to implant it in this code, any help appreciated.

Update

After Edgar Bonet answer, the edited code is:

#define COEFF_A 0.8662984364E-03
#define COEFF_B 2.780704551E-04
#define COEFF_C -0.9395108479E-07
float VRT, Temp, VR;
void setup() {
 Serial.begin(9600);
 analogReference(EXTERNAL);
}
void loop() {
 long Resistance;
 VRT = analogRead(A3);
 VR = 2.52 * VRT / 1024;
 Resistance = 10000 * VR / (2.52 - VR);
 Temp = log(Resistance);
 Temp = 1 / (COEFF_A + (COEFF_B * Temp) + (COEFF_C * pow(Temp, 3)));
 Temp += -273.15;
 Serial.println(Temp);
 delay(500);
}

But the temperature reading is 2 centigrade less than what it should be, when i remove the analogReference(EXTERNAL); it shows the normal/correct temperature readings.

added 824 characters in body; added 68 characters in body; added 1 character in body

Source Link

edited Aug 30, 2019 at 13:44

ElectronSurf

edited Aug 30, 2019 at 13:44

ElectronSurf

schematic

^{simulate this circuit – Schematic created using CircuitLab}

This is the code that I'm using to get the temperature:

#define COEFF_A 0.8662984364E-03
#define COEFF_B 2.780704551E-04
#define COEFF_C -0.9395108479E-07
float VRT, Temp;
float Vref = 2.52;
void setup() {
 Serial.begin(9600);
 analogReference(EXTERNAL);
}
void loop() {
 long Resistance;
 VRT = analogRead(A3);
 Resistance = 10000 / ((1023.0 / VRT) - 1);
 Temp = log(Resistance);
 Temp = 1 / (COEFF_A + (COEFF_B * Temp) + (COEFF_C * pow(Temp, 3)));
 Temp += -273.15;
 Serial.println(Temp);
 delay(500);
}

I know that the calculation should be: V = Vref ×ばつ VRT ÷ 1023 but i don't know how to implant it in this code, any help appreciated.

#Update

After Edgar Bonet answer , the edited code is:

#define COEFF_A 0.8662984364E-03
#define COEFF_B 2.780704551E-04
#define COEFF_C -0.9395108479E-07
float VRT, Temp, VR;
void setup() {
 Serial.begin(9600);
 analogReference(EXTERNAL);
}
void loop() {
 long Resistance;
 VRT = analogRead(A3);
 VR = 2.52 * VRT / 1024;
 Resistance = 10000 * VR / (2.52 - VR);
 Temp = log(Resistance);
 Temp = 1 / (COEFF_A + (COEFF_B * Temp) + (COEFF_C * pow(Temp, 3)));
 Temp += -273.15;
 Serial.println(Temp);
 delay(500);
}

But the temperature reading is 2 centigrade less than what it should be, when i remove the analogReference(EXTERNAL); it shows the normal/correct temperature readings.

schematic

^{simulate this circuit – Schematic created using CircuitLab}

This is the code that I'm using to get the temperature:

#define COEFF_A 0.8662984364E-03
#define COEFF_B 2.780704551E-04
#define COEFF_C -0.9395108479E-07
float VRT, Temp;
float Vref = 2.52;
void setup() {
 Serial.begin(9600);
 analogReference(EXTERNAL);
}
void loop() {
 long Resistance;
 VRT = analogRead(A3);
 Resistance = 10000 / ((1023.0 / VRT) - 1);
 Temp = log(Resistance);
 Temp = 1 / (COEFF_A + (COEFF_B * Temp) + (COEFF_C * pow(Temp, 3)));
 Temp += -273.15;
 Serial.println(Temp);
 delay(500);
}

I know that the calculation should be: V = Vref ×ばつ VRT ÷ 1023 but i don't know how to implant it in this code, any help appreciated.

schematic

^{simulate this circuit – Schematic created using CircuitLab}

This is the code that I'm using to get the temperature:

#define COEFF_A 0.8662984364E-03
#define COEFF_B 2.780704551E-04
#define COEFF_C -0.9395108479E-07
float VRT, Temp;
float Vref = 2.52;
void setup() {
 Serial.begin(9600);
 analogReference(EXTERNAL);
}
void loop() {
 long Resistance;
 VRT = analogRead(A3);
 Resistance = 10000 / ((1023.0 / VRT) - 1);
 Temp = log(Resistance);
 Temp = 1 / (COEFF_A + (COEFF_B * Temp) + (COEFF_C * pow(Temp, 3)));
 Temp += -273.15;
 Serial.println(Temp);
 delay(500);
}

I know that the calculation should be: V = Vref ×ばつ VRT ÷ 1023 but i don't know how to implant it in this code, any help appreciated.

#Update

After Edgar Bonet answer , the edited code is:

#define COEFF_A 0.8662984364E-03
#define COEFF_B 2.780704551E-04
#define COEFF_C -0.9395108479E-07
float VRT, Temp, VR;
void setup() {
 Serial.begin(9600);
 analogReference(EXTERNAL);
}
void loop() {
 long Resistance;
 VRT = analogRead(A3);
 VR = 2.52 * VRT / 1024;
 Resistance = 10000 * VR / (2.52 - VR);
 Temp = log(Resistance);
 Temp = 1 / (COEFF_A + (COEFF_B * Temp) + (COEFF_C * pow(Temp, 3)));
 Temp += -273.15;
 Serial.println(Temp);
 delay(500);
}

But the temperature reading is 2 centigrade less than what it should be, when i remove the analogReference(EXTERNAL); it shows the normal/correct temperature readings.

added 270 characters in body; edited body

Source Link

edited Aug 30, 2019 at 13:03

ElectronSurf

edited Aug 30, 2019 at 13:03

ElectronSurf

schematic

^{simulate this circuit – Schematic created using CircuitLab}

This is the code that I'm using to get the temperature:

#define COEFF_A 0.8662984364E-03
#define COEFF_B 2.780704551E-04
#define COEFF_C -0.9395108479E-07
float VRT, Temp;
float Vref = 2.52;
void setup() {
 Serial.begin(9600);
 analogReference(EXTERNAL);
}
void loop() {
 long Resistance;
 VRT = analogRead(A3);
 Resistance = 10000 / ((1023.0 / VRT) - 1);
 Temp = log(Resistance);
 Temp = 1 / (COEFF_A + (COEFF_B * Temp) + (COEFF_C * pow(Temp, 3)));
 Temp += -273.15;
 Serial.println(Temp);
 delay(500);
}

I know that the calculation should be: V = Vref ×ばつ VRT ÷ 1023 but i don't know how to implant it in this code, any help appreciated.

This is the code that I'm using to get the temperature:

#define COEFF_A 0.8662984364E-03
#define COEFF_B 2.780704551E-04
#define COEFF_C -0.9395108479E-07
float VRT, Temp;
float Vref = 2.52;
void setup() {
 Serial.begin(9600);
 analogReference(EXTERNAL);
}
void loop() {
 long Resistance;
 VRT = analogRead(A3);
 Resistance = 10000 / ((1023.0 / VRT) - 1);
 Temp = log(Resistance);
 Temp = 1 / (COEFF_A + (COEFF_B * Temp) + (COEFF_C * pow(Temp, 3)));
 Temp += -273.15;
 Serial.println(Temp);
 delay(500);
}

I know that the calculation should be: V = Vref ×ばつ VRT ÷ 1023 but i don't know how to implant it in this code, any help appreciated.

schematic

^{simulate this circuit – Schematic created using CircuitLab}

This is the code that I'm using to get the temperature:

#define COEFF_A 0.8662984364E-03
#define COEFF_B 2.780704551E-04
#define COEFF_C -0.9395108479E-07
float VRT, Temp;
float Vref = 2.52;
void setup() {
 Serial.begin(9600);
 analogReference(EXTERNAL);
}
void loop() {
 long Resistance;
 VRT = analogRead(A3);
 Resistance = 10000 / ((1023.0 / VRT) - 1);
 Temp = log(Resistance);
 Temp = 1 / (COEFF_A + (COEFF_B * Temp) + (COEFF_C * pow(Temp, 3)));
 Temp += -273.15;
 Serial.println(Temp);
 delay(500);
}

I know that the calculation should be: V = Vref ×ばつ VRT ÷ 1023 but i don't know how to implant it in this code, any help appreciated.

Source Link

asked Aug 30, 2019 at 12:39

ElectronSurf

asked Aug 30, 2019 at 12:39

ElectronSurf

lang-cpp