ArduinoControl

int thermistorPin = A0;
int Vout;
int limit = 45; // upper temperature limit
float R1 = 10000; // value of resistance on board
float logR2, R2, T; // R2: resistance of thermistor, T: temperature in Celsius
float c1 = 0.001129148, c2 = 0.000234125, c3 = 0.0000000876741; // Steinart-Hart coefficients

int DC1 = 7;
int DC2 = 5;

void setup() {
  pinMode(DC1, OUTPUT);
  pinMode(DC2, OUTPUT);
  Serial.begin(9600);
}

void loop() {

  Vout = analogRead(thermistorPin);
  R2 = R1 * (1023.0 / (float)Vout - 1.0); // calculate resistance of thermistor
  logR2 = log(R2);
  T = (1.0 / (c1 + c2 * logR2 + c3 * logR2 * logR2 * logR2)); // temperature in Kelvin
  T = T - 273.15; // convert Kelvin to Celsius

  if (T > limit) {
    Serial.print("Temperature above limit. Shutting down.");
    digitalWrite(DC1, LOW);
    digitalWrite(DC2, LOW);
    exit(0);  // exit loop if temperature above limit
  }

  Serial.print("Temperature: ");
  Serial.print(T);
  Serial.println(" C");

  if(Serial.available() > 0){
    float receivedT = Serial.parseFloat();

    if(receivedT > T){
      digitalWrite(DC1, HIGH);
      digitalWrite(DC2, LOW);
    }
    else if(receivedT < T){
      digitalWrite(DC1, LOW);
      digitalWrite(DC2, HIGH);
    }
    else{
      digitalWrite(DC1, LOW);
      digitalWrite(DC2, LOW);
    }
  }

  delay(500);
}