#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include <ESP32Servo.h>

// Pin definitions
#define DHTPIN 4
#define DHTTYPE DHT22
#define SOIL_MOISTURE_PIN 34
#define RELAY_PIN 18
#define LED_PIN 2
#define SERVO_PIN 5

// Threshold for soil moisture (adjust as necessary)
const int moistureThreshold = 2000;

// Components
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo waterPump;

void setup() {
  // Initialize Serial Monitor
  Serial.begin(115200);
  
  // Initialize DHT Sensor
  dht.begin();
  
  // Initialize LCD
  lcd.begin(16, 2);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Smart Irrigation Sys");
  
  // Initialize Servo
  waterPump.attach(SERVO_PIN);
  waterPump.write(0); // Initial position
  
  // Initialize pins
  pinMode(SOIL_MOISTURE_PIN, INPUT);
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);
  
  // Deactivate relay initially
  digitalWrite(RELAY_PIN, HIGH);
}

void startWatering() {
  waterPump.write(90); // Assume 90 degrees is the pumping position
  lcd.setCursor(0, 1);
  lcd.print("Watering ON...");
}

void stopWatering() {
  waterPump.write(0); // Assume 0 degrees is the off position
  lcd.setCursor(0, 1);
  lcd.print("Watering OFF");
}

void loop() {
  // Read sensor values
  int soilMoistureValue = analogRead(SOIL_MOISTURE_PIN);
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  
  // Display sensor readings on LCD
  lcd.setCursor(0, 1);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print("C Hum: ");
  lcd.print(humidity);
  lcd.print("%");
  
  // Automatic watering based on soil moisture
  if (soilMoistureValue < moistureThreshold) {
    digitalWrite(RELAY_PIN, LOW); // Activate relay for automatic watering
    startWatering();
  } else {
    digitalWrite(RELAY_PIN, HIGH); // Deactivate relay
    stopWatering();
  }

  // LED indicator for watering status
  if (soilMoistureValue < moistureThreshold) {
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
  }
  
  // Add a small delay to avoid overwhelming the ESP32
  delay(2000);
}