#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

#define biru    13
#define merah   10
#define tombol1  7
#define tombol2  4

void setup() {
  lcd.backlight(); lcd.init();
  lcd.setCursor(0,0); lcd.print("MATERI ARDUINO");
  Serial.begin(9600);
  pinMode(biru,OUTPUT);
  pinMode(merah,OUTPUT);
  pinMode(tombol1,INPUT_PULLUP);
  pinMode(tombol2,INPUT_PULLUP);
}

void loop() {
  if(digitalRead(tombol1)==LOW) {
    for(int i=0;i<100;i++) {
      Serial.print("kedip = "); Serial.println(i);
      digitalWrite(biru,HIGH); delay(100);
      digitalWrite(biru,LOW); delay(100);
    }
  } 
  if(digitalRead(tombol2)==LOW)  {
    digitalWrite(biru,LOW);
  } 
}