const int sensorPin = A0;
const float baselineTemp = 0.0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  for (int pinNumber = 3; pinNumber < 8; 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) * 5.0);
  Serial.print(", Volts:  ");
  Serial.print(voltage);

  Serial.print(",  degrees C:   ");
  float temp = (voltage - .5) * 100;
  Serial.print(temp);
  Serial.print("\n");

  if (temp > baselineTemp && temp <= baselineTemp + 5) {
    digitalWrite(3, HIGH);
    digitalWrite(4, LOW);
    digitalWrite(5, LOW);
    digitalWrite(6, LOW);
    digitalWrite(7, LOW);
    digitalWrite(8, LOW);
  } else if (temp > baselineTemp + 5 && temp <= baselineTemp + 10) {
    digitalWrite(3, HIGH);
    digitalWrite(4, HIGH);
    digitalWrite(5, LOW);
    digitalWrite(6, LOW);
    digitalWrite(7, LOW);
    digitalWrite(8, LOW);
  } else if (temp > baselineTemp + 10 && temp <= baselineTemp + 15) {
    digitalWrite(3, HIGH);
    digitalWrite(4, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(6, LOW);
    digitalWrite(7, LOW);
    digitalWrite(8, LOW);
  } else if (temp > baselineTemp + 15 && temp <= baselineTemp + 20) {
    digitalWrite(3, HIGH);
    digitalWrite(4, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(7, LOW);
    digitalWrite(8, LOW);
  } else if (temp > baselineTemp + 20 && temp <= baselineTemp + 25) {
    digitalWrite(3, HIGH);
    digitalWrite(4, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(8, LOW);
  } else if (temp > baselineTemp + 25) {
    digitalWrite(3, HIGH);
    digitalWrite(4, HIGH);
    digitalWrite(5, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(7, HIGH);
    digitalWrite(8, HIGH);
  }
  delay(1000);
}