#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define potensio A0
#define led 2
LiquidCrystal_I2C lcd (0x27,16,2);

void setup() {
  pinMode(potensio, INPUT);
  pinMode(led, OUTPUT);
  lcd.init();
  lcd.init();
  lcd.backlight ();
  
}

void loop() {
 float ABC = analogRead(potensio);
 float Tegangan = ((ABC/1023)*5);
 lcd.setCursor (1,0);
 lcd.print("Nilai :");
 lcd.setCursor(8,0);
 lcd.print(ABC);
 lcd.setCursor(1,1);
 lcd.print("V     :");
 lcd.setCursor(8,6);
 lcd.print(Tegangan);
 
 if (Tegangan >=2.8 && Tegangan <=3.4 ){
   digitalWrite(led,HIGH);
 }
else {
  digitalWrite(led,LOW);
}
delay(500);
lcd.clear ();
}