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

LiquidCrystal_I2C lcd(0x27, 16, 2); 

const int potPin = A1;        
const int ledPin = 13;        
const int buttonPin = 2;  

bool ledState = false;        
bool lastButtonState = LOW;   

void setup() {
  
  lcd.init();
  lcd.backlight(); 

  pinMode(ledPin, OUTPUT);

  pinMode(buttonPin, INPUT);

  Serial.begin(9600);
}

void loop() {
  bool currentButtonState = digitalRead(buttonPin);

  if (currentButtonState != lastButtonState) {
   
    if (currentButtonState == HIGH) {
      
      ledState = !ledState;
      digitalWrite(ledPin, ledState); 
    }
  }

  lastButtonState = currentButtonState;

  int potValue = analogRead(potPin);
  float voltage = potValue * (5.0 / 1023.0);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Pot Value: ");
  lcd.print(potValue);
  lcd.setCursor(0, 1);
  lcd.print("Voltage: ");
  lcd.print(voltage);
  lcd.print(" V");

  Serial.print("Pot Value: ");
  Serial.print(potValue);
  Serial.print(" | Voltage: ");
  Serial.println(voltage);

  delay(500); 
}