Lite problem med Arduino

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

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600); // open a serial port
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);

//convert the ADC reading to voltage
float voltage = (sensorVal/1024.0) * 5.0;

Serial.print(", Volts: ");
Serial.print(voltage);

Serial.print(", degrees C: ");
//convert the voltage to temp in degrees
float temperature = (voltage - .5) * 100;
Serial.println(temperature);

if(temperature < baselineTemp){
  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);
}