#include <DHT.h>

// Pin definitions
#define DHTPIN 2             // DHT22 data pin
#define DHTTYPE DHT22        // DHT22 sensor type
#define HEATER_LED 3         // LED representing heater
#define BUZZER 4             // Buzzer for overheat alert

DHT dht(DHTPIN, DHTTYPE);    // Create DHT object

void setup() {
  Serial.begin(9600);
  dht.begin();

  pinMode(HEATER_LED, OUTPUT);
  pinMode(BUZZER, OUTPUT);

  digitalWrite(HEATER_LED, LOW);  // Initial state
  digitalWrite(BUZZER, LOW);
}

void loop() {
  float temp = dht.readTemperature();  // Read temperature in Celsius

  if (isnan(temp)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Temperature: ");
  Serial.print(temp);
  Serial.println(" °C");

  if (temp < 40.0) {
    // Too cold → turn on heater
    digitalWrite(HEATER_LED, HIGH);
    digitalWrite(BUZZER, LOW);
    Serial.println("State: Heating");
  }
  else if (temp >= 40.0 && temp < 50.0) {
    // Stable → turn off heater and buzzer
    digitalWrite(HEATER_LED, LOW);
    digitalWrite(BUZZER, LOW);
    Serial.println("State: Stable");
  }
  else {
    // Overheat → turn off heater, turn on buzzer
    digitalWrite(HEATER_LED, LOW);
    digitalWrite(BUZZER, HIGH);
    Serial.println("State: Overheat! Alert!");
  }

  delay(2000);  // Wait for 2 seconds
}