#include <DHT.h>
#include <LiquidCrystal_I2C.h>

#define SOIL_MOISTURE_PIN A0
#define RAIN_SENSOR_PIN A1
#define DHT_TYPE DHT22
#define DHT_PIN 7
#define BUZZER_PIN 8  // Connect the buzzer to digital pin 8

const int relayPin = 4;
const int buzzerThreshold = 70;  // Adjust this threshold based on your needs
const float temperatureThreshold = 35.0;
const int soilMoistureThreshold = 50;
const int readInterval = 1000;

DHT dht(DHT_PIN, DHT_TYPE);
LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  Serial.begin(9600);
  dht.begin();
  lcd.init();
  lcd.backlight();
  pinMode(relayPin, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
}

void loop() {
  static unsigned long lastReadTime = 0;

  if (millis() - lastReadTime >= readInterval) {
    float temperature, humidity;
    float soilMoisture, rainSensor;

    temperature = dht.readTemperature();
    humidity = dht.readHumidity();
    soilMoisture = analogRead(SOIL_MOISTURE_PIN);
    rainSensor = analogRead(RAIN_SENSOR_PIN);

    soilMoisture = map(soilMoisture, 0, 1023, 0, 100);
    rainSensor = map(rainSensor, 0, 1023, 0, 100);

    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Humidity: ");
    lcd.print(humidity);
    lcd.print("%");
    lcd.setCursor(0, 1);
    lcd.print("Temperature: ");
    lcd.print(temperature);
    lcd.print("C");
    lcd.setCursor(0, 2);
    lcd.print("Soil Moisture: ");
    lcd.print(soilMoisture);
    lcd.print("%");
    lcd.setCursor(0, 3);
    lcd.print("Rain Sensor: ");
    lcd.print(rainSensor);
    lcd.print("%");

    if (temperature > temperatureThreshold || soilMoisture < soilMoistureThreshold) {
      digitalWrite(relayPin, LOW);  // Turn on the relay
      if (soilMoisture < buzzerThreshold) {
        beepBuzzer();  // Activate the buzzer
      } else {
        noTone(BUZZER_PIN);  // Turn off the buzzer
      }
    } else {
      digitalWrite(relayPin, HIGH);  // Turn off the relay
      noTone(BUZZER_PIN);  // Turn off the buzzer
    }

    lastReadTime = millis();  // Update last read time
  }
}

void beepBuzzer() {
  // Function to make the buzzer beep continuously
  tone(BUZZER_PIN, 1000);  // You can adjust the frequency (1000 Hz in this case)
  delay(500);  // Adjust the delay between beeps (500 milliseconds in this case)
  noTone(BUZZER_PIN);
  delay(500);
}