//LIBRARY ============================================================
#include <LiquidCrystal_I2C.h>//libray LCD
//====================================================================

//LCD 16x2 ===========================================================
LiquidCrystal_I2C lcd(0x27, 16, 2);
//====================================================================

//Varable ============================================================
int sw1 = 0;
int sw2 = 0;
int k1 = 0;
int k2 = 0;
int counter = 0;
//====================================================================

//MAIN SETUP =========================================================
void setup() {
  pinMode(9,INPUT);
  pinMode(8,INPUT);
  pinMode(13,OUTPUT);
  pinMode(12,OUTPUT);
  pinMode(11,OUTPUT);
  pinMode(10,OUTPUT);

  digitalWrite(13,0);  
  digitalWrite(12,0);  
  digitalWrite(11,0);  
  digitalWrite(10,0);  

  lcd.init();
  lcd.backlight();

  lcd.setCursor(0,0);
  lcd.print("MICROCONTROLLER");
  lcd.setCursor(0,1);
  lcd.print("ELEKTRONIKA");
  delay(2000);
  lcd.clear();
}
//=====================================================================

//MAIN LOOP ===========================================================
void loop() {
  sw1 = digitalRead(9);
  sw2 = digitalRead(8);

  if(sw1 == 1 && k1 == 0){
    k1 = 1;
  }
  if(sw1 == 0 && k1 == 1){
    counter = counter + 1;
    lcd.setCursor(0,0);
    lcd.print(counter);
    lcd.print(" ");
    delay(100);
    //kembalikan k1 ke 0
    k1 = 0;
  }

  if(sw2 == 1 && k2 == 0){
    k2 = 1;
  }
  if(sw2 == 0 && k2 == 1){
    counter = counter - 1;
    lcd.setCursor(0,0);
    lcd.print(counter);
    lcd.print(" ");
    delay(100);
    //kembalikan k1 ke 0
    k2 = 0;
  }

  if(counter >= 10){
  digitalWrite(13,1);   
  }
  if(counter >= 20){
  digitalWrite(12,1);   
  }
  if(counter >= 30){  
  digitalWrite(11,1);  
  }
  if(counter >= 40){  
  digitalWrite(10,1);  
  }
}
//=====================================================================