#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

void setup() {
  Serial.begin(115200);
  LCD.init();
  LCD.backlight();
 }

void loop() {
  unsigned int a = analogRead(A3);
  char buffer[5];
  float b= a/4095.0 * 3.3;
  LCD.setCursor(0,0);
  dtostrf(b,3,1,buffer);
  LCD.print(buffer);
  LCD.print(" Volt");
  delay(2000);
  Serial.println(buffer);
  delay(1000);
  
}