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

#define DHTPIN 2           // Pin where the DHT11 is connected
#define DHTTYPE DHT11      // DHT 11
#define SOIL_MOISTURE_PIN A0 // Pin where the soil moisture sensor is connected
#define RELAY_PIN 3        // Pin where the relay is connected
#define BUTTON_PIN 4       // Pin where the button is connected
#define SPEAKER_PIN 9      // Pin where the speaker is connected
#define LDR_PIN A1         // Pin where the photoresistor is connected

DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address to 0x27 for a 16 chars and 2 line display

int soilMoistureValue = 0;
int ldrValue = 0;
float temperature = 0;
float humidity = 0;
bool relayState = false;

void setup() {
  // Initialize the LCD
  lcd.begin(16, 2); // Specify the dimensions of the LCD
  lcd.backlight();
  
  // Display welcome message
  lcd.setCursor(0, 0);
  lcd.print("Smart Garden");
  lcd.setCursor(0, 1);
  lcd.print("Initializing...");
  delay(3000); // Show the message for 3 seconds

  // Initialize the DHT sensor
  dht.begin();

  // Set up the pin modes
  pinMode(SOIL_MOISTURE_PIN, INPUT);
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  pinMode(SPEAKER_PIN, OUTPUT);
  pinMode(LDR_PIN, INPUT);

  // Start with the relay off
  digitalWrite(RELAY_PIN, LOW);
}

void loop() {
  // Read the soil moisture level
  soilMoistureValue = analogRead(SOIL_MOISTURE_PIN);
  
  // Read the temperature and humidity
  temperature = dht.readTemperature();
  humidity = dht.readHumidity();

  // Read the LDR value
  ldrValue = analogRead(LDR_PIN);

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

  lcd.setCursor(0, 1);
  lcd.print("Soil: ");
  lcd.print(soilMoistureValue);
  lcd.print(" LDR: ");
  lcd.print(ldrValue);

  // Check soil moisture level and control the relay
  if (soilMoistureValue < 500) { // Adjust the threshold as needed
    digitalWrite(RELAY_PIN, HIGH);
    relayState = true;
    tone(SPEAKER_PIN, 1000); // Play a tone when watering
  } else {
    digitalWrite(RELAY_PIN, LOW);
    relayState = false;
    noTone(SPEAKER_PIN);
  }

  // Check if the button is pressed to manually control the relay
  if (digitalRead(BUTTON_PIN) == LOW) {
    relayState = !relayState; // Toggle the relay state
    digitalWrite(RELAY_PIN, relayState ? HIGH : LOW);
    delay(300); // Debounce delay
  }

  delay(2000); // Wait 2 seconds before the next loop
}