// Define constants
const int temperaturePin = A0;   // Analog pin for temperature sensor
const int fanControlPin = 2;     // Digital pin for relay control switch which turns on and of the fan

const float BETA = 3950; // should match the Beta Coefficient of the thermistor, took it from wokwi docs

void setup() {
  // Initialize serial communication
  Serial.begin(9600);

  // Set relay control pin as output and temperature sensor pin
  pinMode(fanControlPin, OUTPUT);
  pinMode(temperaturePin, INPUT);
}

void loop() {
  // Read temperature from the sensor
  int analogValue = analogRead(A0);

  //here converting data from the sensor to temperature
  float celsius = 1 / (log(1 / (1023. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;

  //Printing the temperature on a sensor
  Serial.println(celsius);

  
  if (celsius > 27)// if temperature on the sensor is high
  {
    digitalWrite(fanControlPin, HIGH);// Turn on the fan
  } 
  else if (celsius <= 25) 
  { 
    digitalWrite(fanControlPin, LOW);// Turn off the fan
  }
  
  // Add a delay to avoid rapid switching
  delay(100);
}