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


LiquidCrystal_I2C lcd(0x27, 16, 2);

const int vpin = A0;  // Pin for Voltage Sensor/Potentiometer
const int buzz = 4;    // Pin for Buzzer
const int led = 2; //Pin for LED
const int button = 3;    // Pin for Button(Reset)

void setup() {
  lcd.init();               
  lcd.backlight();         
  
  pinMode(buzz, OUTPUT);
  pinMode(led, OUTPUT);
  pinMode(button, INPUT_PULLUP);  
  Serial.begin(9600);  
}

void loop() {
  int voltageValue = analogRead(vpin);
  float voltage = (voltageValue / 1023.0) * 5.0; 


  lcd.setCursor(0, 0);
  lcd.print("Battery Voltage:");
  lcd.setCursor(0, 1);
  lcd.print(voltage);
  lcd.print(" V    "); 


  if (voltage < 2.5) {  
    digitalWrite(led, HIGH);
    digitalWrite(buzz, HIGH);
    delay(1000);
  } else {
    digitalWrite(led, LOW);
    digitalWrite(buzz, LOW);
    delay(1000);
  }


  if (digitalRead(button) == HIGH) {
    digitalWrite(led, LOW);
    digitalWrite(buzz, LOW);
    delay(1000);
  } 

  delay(500);  
}