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

#define pb1 2       //Button 1 pada pin D2
#define pb2 3
#define pb3 4
#define buz1 1
#define LED1 5      //LED1 pada pin D5
#define LED2 6
#define LED3 7
#define ulang 8     //Button reset pada pin D8
#define buzzer 9



bool kunci = false;
void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(1,0);
  lcd.print("CERDAS CERMAT");
  delay(2000);
  lcd.clear();
  lcd.setCursor(4,0);
  lcd.print("MULAI");
  delay(5000);
  lcd.clear();
  
  pinMode(pb1, INPUT_PULLUP);
  pinMode(pb2, INPUT_PULLUP);
  pinMode(pb3, INPUT_PULLUP);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(ulang, INPUT_PULLUP);
  pinMode(buzzer, OUTPUT);
  
}
void loop() {
  if(kunci == false){
    if(digitalRead (pb1) == LOW){
      digitalWrite(LED1, HIGH);
      digitalWrite(buzzer, HIGH);
      tone(9, 1000);
      kunci = true;
      lcd.println("kelompok 1");
      
    }
    else if(digitalRead (pb2) == LOW){
      digitalWrite(LED2, HIGH);
      tone(9, 1000);
      digitalWrite(buz1, HIGH);
      kunci = true;
      lcd.println("kelompok 2");
    }
    else if(digitalRead (pb3) == LOW){
      digitalWrite(LED3, HIGH);
      tone(9, 1000);
      digitalWrite(buz1, HIGH);
      kunci = true;
      lcd.println("kelompok 3");
    }
  }
  else{
    if(digitalRead (ulang) == LOW){
      kunci = false;
      noTone(9);
      digitalWrite(LED1, LOW);
      digitalWrite(LED2, LOW);
      digitalWrite(LED3, LOW);
      delay(200);
      lcd.clear();
    }
  }
}