#include <DHT.h>
#define DHTPIN 4        // DHT22 sensor pin
#define DHTTYPE DHT22   // DHT22 sensor type
#define RELAYPIN 16     // Relay pin
#define BUTTONPIN 5     // Pushbutton pin
#define BUZZERPIN 17    // Buzzer pin

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  pinMode(RELAYPIN, OUTPUT);
  digitalWrite(RELAYPIN, LOW);
  pinMode(BUTTONPIN, INPUT_PULLUP);  // Assuming the button is connected to GND
  pinMode(BUZZERPIN, OUTPUT);
  digitalWrite(BUZZERPIN, LOW);
  dht.begin();
  Serial.begin(9600);  // Initialize serial communication
}

void loop() {
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Error reading temperature or humidity!");
    return;
  }
  
  bool buttonState = digitalRead(BUTTONPIN);

  if (temperature >= 30.0 || humidity <= 85.0 || buttonState == LOW) {  // Relay turns on if any condition is met
    digitalWrite(RELAYPIN, HIGH);
    digitalWrite(BUZZERPIN, HIGH);  // Turn on the buzzer when the relay is on
  } else {
    digitalWrite(RELAYPIN, LOW);
    digitalWrite(BUZZERPIN, LOW);  // Turn off the buzzer when the relay is off
  }

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.print(" %, Button State: ");
  Serial.println(buttonState ? "Not Pressed" : "Pressed");

  delay(1000); // Delay 1 second
}