float suhu = 24;

const int ledMerah = 32, ledKuning = 33, ledHijau = 25;

void setup() {
  // put your setup code here, to run once:
  pinMode(ledMerah, OUTPUT);
  pinMode(ledKuning, OUTPUT);
  pinMode(ledHijau, OUTPUT);

  Serial.begin(9600);
}

void loop() {
  if(suhu > 39){
    digitalWrite(ledMerah, 1);
    digitalWrite(ledKuning, 0);
    digitalWrite(ledHijau, 0);
    Serial.println("LED Merah menyala");
  }
  else if(suhu >= 20 && suhu <= 30){
    digitalWrite(ledMerah, 0);
    digitalWrite(ledKuning, 1);
    digitalWrite(ledHijau, 0);
    Serial.println("LED Kuning menyala");
  }
  else {
    digitalWrite(ledMerah, 0);
    digitalWrite(ledKuning, 0);
    digitalWrite(ledHijau, 1);
    Serial.println("LED Hijau menyala");
  }
  delay(500); // this speeds up the simulation
}