const int analogPin = 27; // Pin ADC sensor NTC terhubung
const int greenLedPin = 12; // Pin LED hijau terhubung
const int yellowLedPin = 13; // Pin LED kuning terhubung
const int redLedPin = 14; // Pin LED merah terhubung

void setup() {
  pinMode(greenLedPin, OUTPUT);
  pinMode(yellowLedPin, OUTPUT);
  pinMode(redLedPin, OUTPUT);
  
  digitalWrite(greenLedPin, LOW);
  digitalWrite(yellowLedPin, LOW);
  digitalWrite(redLedPin, LOW);

  Serial.begin(9600);
}

void loop() {
  int analogValue = analogRead(analogPin);
  float celsius = 1 / (log(1 / (4096.0 / analogValue - 1)) / 3950 + 1.0 / 298.15) - 273.15;

  Serial.print("Temperature: ");
  Serial.print(celsius);
  Serial.println(" C");

  if (celsius >= 0 && celsius <= 30) {
    digitalWrite(greenLedPin, HIGH); // LED hijau menyala
    digitalWrite(yellowLedPin, LOW); // LED kuning mati
    digitalWrite(redLedPin, LOW); // LED merah mati
  } 
  else if(celsius > 30 && celsius <= 70){
    digitalWrite(greenLedPin, HIGH); // LED hijau menyala
    digitalWrite(yellowLedPin, HIGH); // LED kuning mati
    digitalWrite(redLedPin, LOW); // LED merah mati
  }
  else if(celsius > 70 && celsius <= 100){
    digitalWrite(greenLedPin, HIGH); // LED hijau menyala
    digitalWrite(yellowLedPin, HIGH); // LED kuning mati
    digitalWrite(redLedPin, HIGH); // LED merah mati
  }
  else {
    digitalWrite(greenLedPin, LOW); // LED hijau mati
    digitalWrite(yellowLedPin, LOW); // LED kuning mati
    digitalWrite(redLedPin, LOW); // LED merah menyala
  }

  delay(500); // Delay 1 detik untuk mengurangi pembacaan sensor yang berlebihan
}