#include "DHT.h"

// Define sensor type and pin
#define DHTPIN 2
#define DHTTYPE DHT22  // Changed from DHT11 to DHT22

// Define control pins
#define RELAYPIN 3
#define BUTTON_ON 4
#define BUTTON_OFF 5
#define LED_STATUS 6
#define LED_SENSOR 7

DHT dht(DHTPIN, DHTTYPE);  // Initialize DHT22

void setup() {
  pinMode(RELAYPIN, OUTPUT);
  pinMode(BUTTON_ON, INPUT_PULLUP);
  pinMode(BUTTON_OFF, INPUT_PULLUP);
  pinMode(LED_STATUS, OUTPUT);
  pinMode(LED_SENSOR, OUTPUT);
  dht.begin();
  Serial.begin(9600);
}

void loop() {
  // Read temperature and humidity
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();

  // Blink sensor LED to show activity
  digitalWrite(LED_SENSOR, HIGH);
  delay(100);
  digitalWrite(LED_SENSOR, LOW);

  // Check for sensor errors
  if (isnan(temp) || isnan(hum)) {
    Serial.println("Sensor error");
    return;
  }

  // Print readings to Serial Monitor
  Serial.print("Temp: "); Serial.print(temp);
  Serial.print(" °C, Humidity: "); Serial.println(hum);

  // Manual control
  if (digitalRead(BUTTON_ON) == LOW) {
    digitalWrite(RELAYPIN, HIGH);
  } else if (digitalRead(BUTTON_OFF) == LOW) {
    digitalWrite(RELAYPIN, LOW);
  }
  // Automatic control based on temperature
  else if (temp > 30) {
    digitalWrite(RELAYPIN, HIGH);
  } else {
    digitalWrite(RELAYPIN, LOW);
  }

  // Update status LED
  digitalWrite(LED_STATUS, digitalRead(RELAYPIN));

  delay(2000);  // Wait before next reading
}