const int sensorPin = A0;
const float baselineTemp = 20.0;
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: ");
Serial.print(sensorVal);
float voltage = (sensorVal/1024.0)*5.0;
Serial.print(" , Volt: ");
Serial.print(voltage);
Serial.print(" , Grad 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,LOW);
}
else if(temperature >= (baselineTemp +6) ){
  digitalWrite(2,HIGH);
  digitalWrite(3,HIGH);
  digitalWrite(4,HIGH);
}
delay(1);

}