[SOLVED] Arduino killing all my temp sensors?

Projects General Guidance
6

Here is the code for the “sensors bench”:

// A1 : thermistor 10k SR PASSIVES (Ref tme.eu NTCC-10K)
// A2 : thermistor 10k noname (Ref tme.eu 640-10K)
// A3 : LM35DZ
// A4 : LM335Z
// A5 : MCP9700
// resultat LM35 = NTCC-10K > 640-10K > MCP9700 (impedance) > LM335 (nocal)

#include <math.h>;

int therm1Pin = A1;
int therm2Pin = A2;
int lm35Pin = A3;
int lm335Pin = A4;
int mcp9700Pin = A5;

void setup() {
  Serial.begin(9600);
  Serial.println("Ready.");
}

//this function copy pasted from an example I found
double Thermistor(int RawADC) {
  double Temp;
  // See http://en.wikipedia.org/wiki/Thermistor for explanation of formula
  Temp = log(((10240000/RawADC) - 10000));
  Temp = 1 / (0.001129148 + (0.000234125 * Temp) + (0.0000000876741 * Temp * Temp * Temp));
  Temp = Temp - 273.15;           // Convert Kelvin to Celcius
  return Temp;
}

void loop() {
  // display labels
  Serial.println("\t\tTherm1\t\tTherm2\t\tLM35\t\tLM335\t\tMCP9700");
  
  // read every sensor senseurs
  int therm1 = analogRead(therm1Pin);
  int therm2 = analogRead(therm2Pin);
  int lm35   = analogRead(lm35Pin);      //
  delay(5);                              // multiplexage?
      lm35  = analogRead(lm35Pin);      //
  int lm335  = analogRead(lm335Pin);
  delay(5);
      lm335 = analogRead(lm335Pin);
  int mcp9700= analogRead(mcp9700Pin);
  delay(5);
      mcp9700 = analogRead(mcp9700Pin);
      
  // display raw analog
  Serial.print("Analog:\t\t");
  Serial.print(therm1); Serial.print("\t\t");
  Serial.print(therm2); Serial.print("\t\t");
  Serial.print(lm35); Serial.print("\t\t");
  Serial.print(lm335); Serial.print("\t\t");
  Serial.println(mcp9700);
  
  // convert to volts
  float voltTherm1 = therm1 / 1023.0 * 5.0;
  float voltTherm2 = therm2 / 1023.0 * 5.0;
  float voltLm35   = lm35 * (5.0 / 1023);
  float voltLm335  = lm335 / 1023.0 * 5.0;
  float voltMcp9700= mcp9700 / 1023.0 * 5.0;
  
  // display voltages
  Serial.print("Voltages:\t");
  Serial.print(voltTherm1, 4); Serial.print("\t\t");
  Serial.print(voltTherm2, 4); Serial.print("\t\t");
  Serial.print(voltLm35, 4); Serial.print("\t\t");
  Serial.print(voltLm335, 4); Serial.print("\t\t");
  Serial.println(voltMcp9700, 4);
  
  // convert to celsius
  float celsTherm1 = Thermistor(therm1);
  float celsTherm2 = Thermistor(therm2);
  float celsLm35 = (voltLm35*100);
  float celsLm335 = (voltLm335*100)-273.15;
  float celsMcp9700 = ((voltMcp9700-.5)*100);
  
  // display celsius
  Serial.print("Temps:\t\t");
  Serial.print(celsTherm1); Serial.print("\t\t");
  Serial.print(celsTherm2); Serial.print("\t\t");
  Serial.print(celsLm35); Serial.print("\t\t");
  Serial.print(celsLm335); Serial.print("\t\t");
  Serial.println(celsMcp9700);
  
  // new line
  Serial.println("*******************************************************************************************************************************");
  delay(1000);
}

And for the second schematics. This is going to be a fridge temperature monitoring alarm. Note there are provisions for lights and a piezzo. It used to work the way it was in Fritzing and with the same code the first time I wired it around. When I saw the sensor's mess, I disconnected everything but the sensor to try and narrow down the problem:

// prend la temperature sur A0 (MCP9700), la converti en Volts puis en Celsius puis
// imprime sur port serie

int tempPin = 0;

int loLedPin = 8;
int okLedPin = 9;
int hiLedPin = 10;
int piezoPin = 11;

int analogTempRead;
float celsiusTempRead;
int aref_voltage;

void setup() {
  Serial.begin(9600);
  aref_voltage = 50;           // *10 to avoid setting a float if using 3.3V
  pinMode(loLedPin, OUTPUT);
  pinMode(okLedPin, OUTPUT);
  pinMode(hiLedPin, OUTPUT);
  pinMode(piezoPin, OUTPUT);
  Serial.println("Ready.");
}

void loop() {
  analogTempRead = 0;
  for (int i =0; i<16; i++) analogTempRead += analogRead(tempPin);
  float volt = analogTempRead * (aref_voltage/10.0)/16368;
  Serial.print(volt); Serial.println(" V");

  int celsiusTempRead = ((volt-.5)*100)+0.5;   // +0.5 to round up
  //celsiusTempRead = 150;
  Serial.print("Temperature = "); Serial.print(celsiusTempRead); 
  Serial.println(" C");
  
  if (celsiusTempRead >= -30 && celsiusTempRead <= 0) {
    digitalWrite(loLedPin, HIGH);
    digitalWrite(okLedPin, LOW);
    digitalWrite(hiLedPin, LOW);
    delay(300);
  }
  if (celsiusTempRead > 0 && celsiusTempRead <= 8) {
    digitalWrite(loLedPin, LOW);
    digitalWrite(okLedPin, HIGH);
    digitalWrite(hiLedPin, LOW);
    delay(300);
  }
  if (celsiusTempRead > 8 && celsiusTempRead <= 100) {
    digitalWrite(loLedPin, LOW);
    digitalWrite(okLedPin, LOW);
    digitalWrite(hiLedPin, HIGH);
    delay(300);
  }
  if (celsiusTempRead < -30 || celsiusTempRead > 100) {
    digitalWrite(loLedPin, HIGH);
    digitalWrite(okLedPin, LOW);
    digitalWrite(hiLedPin, HIGH);
    analogWrite(piezoPin, 1);
    delay(150);
    digitalWrite(loLedPin, LOW);
    digitalWrite(okLedPin, HIGH);
    digitalWrite(hiLedPin, LOW);
    delay(150);
  }
}