#include <LiquidCrystal_I2C.h>
const int pinBt1 = 2;
const int pinBt2 = 3;
const int pinLED = 11;
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(2, 0);
  lcd.print("halo");
  digitalWrite(pinBt1, HIGH);
  digitalWrite(pinBt2, HIGH);
}
int cerah = 0;
void loop() {
  if(digitalRead(pinBt1) == LOW){
    cerah ++;
  }else{
    digitalWrite(pinBt2, LOW);
    cerah --;
  }
  cerah =constrain(cerah, 0, 3300);
  lcd.setCursor(2, 0);
  lcd.print("halo");
  analogWrite(pinLED, cerah);

  delay(20);
}