#include <OneWire.h>
#include <DallasTemperature.h>
#include <Servo.h>

#define ONE_WIRE_BUS 5      // DS18B20 data pin connected to digital pin 5
#define LED_PIN 13          // LED connected to digital pin 13
#define SERVO_PIN 9         // Servo motor control pin connected to digital pin 9
#define TEMPERATURE_THRESHOLD 30 // Temperature threshold in Celsius


OneWire oneWire(ONE_WIRE_BUS); // for communicating with the DS18B20 sensor
DallasTemperature sensors(&oneWire);// for handling temperature readings
Servo fanServo; // Create a Servo object to control the servo motor

void setup() {
  Serial.begin(9600);
  pinMode(LED_PIN, OUTPUT);
  pinMode(SERVO_PIN, OUTPUT);
  sensors.begin();
  fanServo.attach(SERVO_PIN);
}

void loop() {
 
  sensors.requestTemperatures();
  float temperature = sensors.getTempCByIndex(0);
  if (temperature != DEVICE_DISCONNECTED_C) {
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.println(" °C");

    if (temperature >= TEMPERATURE_THRESHOLD) {
      digitalWrite(LED_PIN, HIGH); // Turn on the LED
      fanServo.write(90); // Rotate the servo to 90 degrees (representing the fan on position)
      Serial.println("countdown");
      for (int countdownValue = 59; countdownValue >= 0;)
      {
      Serial.println(countdownValue);
      countdownValue--;
      delay(1000);
      }
    }
    else {
      digitalWrite(LED_PIN, LOW);  // Turn off the LED
      fanServo.write(0); // Rotate the servo to 0 degrees
    }
  } 
    delay(2000); // Delay between readings
}