// Potentiometer is connected to GPIO 34 (Analog ADC1_CH6) 
const int potPin = 15;

// variable for storing the potentiometer value
int ADC = 0;


void setup() {
  Serial.begin(115200);
  delay(1000);
}

void loop() {
  // Reading potentiometer value
  ADC = analogRead(potPin);
  Serial.print("Analog value: ");
  Serial.print(ADC);
  Serial.print(" volt: ");
  Serial.print(ADC*3.3/4095);
  Serial.print(" temp: ");
  Serial.print((ADC*3.3/4095)/0.01);
  Serial.println(" C ");
  delay(100);
}

tugas :
led hijau on suhu <27
led kuning on suhu 27-29
led merah on suhu 30-32
led merah blink suhu >32