Compostera.ino

const int sensorPin= A0;
const float baselineTemp= 20.0; 

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  
  for (int pinNumber= 2 ; pinNumber<5; pinNumber ++) {
    pinMode (pinNumber, OUTPUT);
    digitalWrite(pinNumber, LOW);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  int sensorVal = analogRead(sensorPin);
  Serial.print("Sensor Value:");
  Serial.print(sensorVal);
  float voltage = (sensorVal/1024.0)*5;
  Serial.print(", Volts: ");
  Serial.print(voltage);
  Serial.print(", degrees C: ");
  float temperature = (voltage- .5) * 100;
  Serial.println(temperature);

  if (temperature < baselineTemp+2){
    digitalWrite(2,LOW);
    digitalWrite(3,LOW);
    digitalWrite(4,LOW);
  }else if (temperature < baselineTemp+2 && temperature < baselineTemp+4){
    digitalWrite(2,HIGH);
    digitalWrite(3,LOW);
    digitalWrite(4,LOW);
  }else if (temperature < baselineTemp+4 && temperature < baselineTemp+6){
    digitalWrite(2,HIGH);
    digitalWrite(3,HIGH);
    digitalWrite(4,HIGH);
  }
  delay(1);
}