const int sensorPin = A0;
const float baselineTemp = 150.0;
void setup(){
  Serial.begin(9600);
  for(int pinNumber = 2; pinNumber<5; pinNumber++) {
    pinMode(pinNumber, OUTPUT);
    digitalWrite(pinNumber, LOW);
  }
}
void loop(){
  int sensorVal = analogRead(sensorPin);
  Serial.print("Sensor Value: ");
  Serial.print(sensorVal);

  float voltage = (sensorVal*5.0) / 1024.0;
  float milliVolt = voltage * 1000;
  Serial.print(", Volt: ");
  Serial.print(voltage);
  Serial.print(", degrees C: ");

  float temperature = (milliVolt - 500) / 10;
  Serial.println(temperature);
  delay(250);
  
  if(temperature < baselineTemp) {
    digitalWrite(2, LOW);
    digitalWrite(3, LOW);
    digitalWrite(4, LOW);
  }else if(temperature >= baselineTemp+25 && temperature < baselineTemp+35){
    digitalWrite(2, HIGH);
    digitalWrite(3, LOW);
    digitalWrite(4, LOW);
  }else if(temperature >= baselineTemp+35 && temperature < baselineTemp+50){
    digitalWrite(2, HIGH);
    digitalWrite(3, HIGH);
    digitalWrite(4, LOW);
  }else if(temperature >= baselineTemp+50){
    digitalWrite(2, HIGH);
    digitalWrite(3, HIGH);
    digitalWrite(4, HIGH);
  }
  delay(1);
}