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

#define DHTPIN 2         // DHT22 data pin connected to Arduino digital pin 2
#define DHTTYPE DHT22   // DHT22 sensor type
#define RELAY_PIN 8       // Digital pin connected to the relay module
DHT dht(DHTPIN, DHTTYPE);

const int trigPin = 9;  // Ultrasonic sensor trigger pin
const int echoPin = 10; // Ultrasonic sensor echo pin

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 columns and 2 rows
const float temperatureThreshold = 50.0; // Set your temperature threshold in Celsius
void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);
  dht.begin();
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(RELAY_PIN, OUTPUT);
}

void loop() {
  // Measure temperature and humidity using DHT22
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Display temperature and humidity on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");

  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print(" %");

  delay(2000); // Wait for a moment

  // Measure water level using ultrasonic sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  long duration = pulseIn(echoPin, HIGH);
  float distance = (duration * 0.0343) / 2;

  // Display water level on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Water Level:");
  lcd.setCursor(0, 1);
  lcd.print(distance);
  lcd.print(" cm");

  delay(2000); // Wait for a moment
  // Check if temperature exceeds the threshold
  if (temperature > temperatureThreshold) {
    // If temperature is above the threshold, turn off the relay
    digitalWrite(RELAY_PIN, LOW);
    Serial.println("Turning off the system.");


  } else {
    // If temperature is below the threshold, keep the relay on
    digitalWrite(RELAY_PIN, HIGH);
    Serial.println("System is running.");

  }
  delay(2000);
}