#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);  

void setup() {
  lcd.init();
  lcd.backlight();
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
}

void loop() {
  int pot = analogRead(A0);
  int pot1 = map(pot,0,1023,0,100);
  int led = 0;

  if (pot1 < 1) {
    led = 1;
    digitalWrite(2, HIGH);
    digitalWrite(3, LOW);
    digitalWrite(4, LOW);
    digitalWrite(5, LOW);
  } else if (pot1 < 30) {
    led = 2;
    digitalWrite(2, LOW);
    digitalWrite(3, HIGH);
    digitalWrite(4, LOW);
    digitalWrite(5, LOW);
  } else if (pot1 < 60) {
    led = 3;
    digitalWrite(2, LOW);
    digitalWrite(3, LOW);
    digitalWrite(4, HIGH);
    digitalWrite(5, LOW);
  } else  {
    led = 4;
    digitalWrite(2, LOW);
    digitalWrite(3, LOW);
    digitalWrite(4, LOW);
    digitalWrite(5, HIGH);
  }

  lcd.setCursor(0, 0);
  lcd.print("LED ");
  lcd.print(led);

  delay(100);
}