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

#define SENSOR_PIN A0  // Analog pin for sensor
#define RELAY_PIN 7    // Relay control pin

LiquidCrystal_I2C lcd(0x27, 16, 2);  // I2C Address 0x27 or 0x3F

void setup() {
  pinMode(RELAY_PIN, OUTPUT);
  lcd.begin(16,2);
  lcd.backlight();
  
  lcd.setCursor(0, 0);
  lcd.print("Sensor Reading:");
}

void loop() {
  int sensorValue = analogRead(SENSOR_PIN);
  
  lcd.setCursor(0, 1);
  lcd.print("Value: ");
  lcd.print(sensorValue);
  lcd.print("   "); // Clears extra characters

  if (sensorValue > 500) {
    digitalWrite(RELAY_PIN, HIGH);
    lcd.setCursor(0, 0);
    lcd.print("Relay ON       ");
  } else {
    digitalWrite(RELAY_PIN, LOW);
    lcd.setCursor(0, 0);
    lcd.print("Relay OFF      ");
  }

  delay(500);  // Prevent flickering
}