#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
#define led     2
#define tombol1 3
#define tombol2 4

void setup() {
  Serial.begin(9600);
  Serial.println("ready");
  lcd.backlight(); lcd.init();
  lcd.setCursor(0,0); lcd.print(" ROBOTIK ADZKIA ");
  pinMode(led,OUTPUT);
  pinMode(tombol1,INPUT_PULLUP);
  pinMode(tombol2,INPUT_PULLUP);  
}
void loop() {
  if(Serial.available()) {
    char input_serial = Serial.read();
    if(input_serial=='a') {
      digitalWrite(led,HIGH);
      lcd.setCursor(0,1); lcd.print("LED ON ");
    }
    else if(input_serial=='b') {
      digitalWrite(led,LOW);
      lcd.setCursor(0,1); lcd.print("LED OFF ");
    }    
  }
  
  if(digitalRead(tombol1)==LOW) {
    for(int i=0;i<10;i++) {
      lcd.setCursor(0,1); lcd.print("Nilai i="); lcd.print(i); 
      digitalWrite(led,HIGH); delay(300);
      digitalWrite(led,LOW);  delay(300); 
    }    
  }
  else if(digitalRead(tombol2)==LOW) {
    for(int i=0;i<5;i++) {
      lcd.setCursor(0,1); lcd.print("Nilai i="); lcd.print(i);
      digitalWrite(led,HIGH); delay(300);
      digitalWrite(led,LOW);  delay(300);
    }  
  }
}