#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd = LiquidCrystal_I2C(0x27,16,2);

void setup(){
  Serial.begin(1115200);
  lcd.init();
  lcd.backlight();
}

void loop(){
  unsigned int a = analogRead(A3);
  char buffer[5];
  float b = a/4095*3.3;
  lcd.setCursor(0,0);
  dtostrf(b,1,1,buffer);
  lcd.print(buffer);
  lcd.print(" Volt");
  delay(2000);
  Serial.println(buffer);
  delay(1000);

}