// Pin assignments
#define NTC_SENSOR_PIN 34 // Analog pin connected to NTC sensor
#define LED_PIN 21        // Digital pin connected to LED

// Calibration constants for the NTC sensor (you may need to adjust these)
#define BETA 3950         // Beta coefficient (change this according to your NTC sensor)
#define R25 10000         // Resistance at 25°C in Ohms

void setup() {
  Serial.begin(115200);        // Initialize serial communication
  pinMode(LED_PIN, OUTPUT);    // Set the LED pin as an output
  digitalWrite(LED_PIN, LOW);  // Initially turn off the LED
}

void loop() {
  int rawValue = analogRead(NTC_SENSOR_PIN);  // Read the raw value from the NTC sensor
  float voltage = (rawValue / 4095.0) * 3.3; // Convert to voltage (3.3V reference)

  // Calculate the resistance of the NTC thermistor
  float resistance = (3.3 / voltage) - 1;
  resistance = R25 / resistance;

  // Calculate the temperature using the Beta formula
  float temperature = 1.0 / (log(resistance / R25) / BETA + 1.0 / 298.15) - 273.15; // Convert to Celsius

  // Print the temperature to the serial monitor
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");

  // Check if the temperature exceeds or equals 80°C
  if (temperature >= 80.0) {
    digitalWrite(LED_PIN, HIGH);  // Turn on the LED if the temperature is 80°C or above
  } else {
    digitalWrite(LED_PIN, LOW);   // Turn off the LED if the temperature is below 80°C
  }

  delay(1000);  // Wait 1 second before taking another reading
}