// Analog input pin for the NTC thermistor
const int NTC_PIN = 13;

// Temperature threshold to trigger the alarm (adjust as needed)
const float TEMPERATURE_THRESHOLD = 30.0;

void setup() {
  Serial.begin(115200);
  pinMode(NTC_PIN, INPUT);
}

void loop() {
  int rawValue = analogRead(NTC_PIN);
  float voltage = (rawValue / 4095.0) * 3.3; // Assuming ESP32 ADC has a 12-bit resolution (4096 levels) and operates at 3.3V

  // Calculate resistance of NTC thermistor using voltage divider formula
  float resistance = (3.3 * 10000) / voltage - 10000;

  // Assuming a 10KΩ NTC thermistor, use Steinhart-Hart equation to calculate temperature
  float A = 0.003354016;  // Steinhart-Hart coefficients
  float B = 0.000256985;
  float C = 0.000002620131;
  float tempK = 1 / (A + B * log(resistance) + C * pow(log(resistance), 3));
  float tempC = tempK - 273.15;

  Serial.print("Temperature: ");
  Serial.print(tempC);
  Serial.println("C");

  if (tempC > TEMPERATURE_THRESHOLD) {
    // Alarm condition
    // You can add code here to trigger an external alarm or take other actions
  }

  delay(1000); // Wait for 1 second before updating temperature
}