#include <LiquidCrystal_I2C.h>
#define off 0
LiquidCrystal_I2C lcd(0x27, 16, 2);
#define tombol 2 
int relayPin[13]={3,4,5,6,7,8,9,10,11,12,13};
int counter;
unsigned long waktu_sebelum=0; 
unsigned long waktu_sebelum1=0; 

int flag=0;
int flag_1=0;

int kondisi=1;

void setup() {
  for (int i = 0; i<10; i++)
  {pinMode(relayPin[i], OUTPUT);}
  pinMode(tombol, INPUT_PULLUP);
  lcd.backlight();
  lcd.init();
  lcd.setCursor(0,0);
  lcd.print("Kontrol 10 Relay");
  delay(1000);
  lcd.clear();
   
}

void loop() 
{
 
 lcd.setCursor(0,0);lcd.print(String () + "Mode :" + counter);
 if(digitalRead(tombol)==LOW ){delay(200); counter ++;} 
 if (counter==5){counter=0;}

if (counter==1)
{
  unsigned long waktu_awal = millis(); 
  if ( waktu_awal- waktu_sebelum >=500 )
  { waktu_sebelum=waktu_awal;
    if (flag==0){flag=1;}else {flag=0;}
    digitalWrite(relayPin[0],flag);
    digitalWrite(relayPin[1],flag);
    digitalWrite(relayPin[2],flag);
    }
}

}