#include <LiquidCrystal_I2C.h>
#define CLK_pin 6
#define DT_pin 7
#define SW_pin 8

int selectedItem = 0,sw_count=1;
int topMenuItem = 0;
String menu1[10]={"ABC","BCD","ABCCBS","FBCD","AEBC","BGCD","WABC","HBCD","AJBC","BCBD"};

LiquidCrystal_I2C lcd(0x27, 16, 2);
int lastclk=1;
void setup() {
  // put your setup code here, to run once:
  pinMode(CLK_pin, INPUT_PULLUP);
  pinMode(DT_pin, INPUT_PULLUP);
  pinMode(SW_pin, INPUT_PULLUP);


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

}


void main_screen() {
  lcd.setCursor(0,1);
  lcd.print(selectedItem);
}

void hienthimenu() {
   //lcd.clear();
  for (int i = 0; i < 2 && (topMenuItem + i) < 10; i++) {  // Hiển thị 2 mục
    if (topMenuItem + i == selectedItem) {
      lcd.setCursor(0, i);
      lcd.print(">");
    } else {
      lcd.setCursor(0, i);
      lcd.print(" ");
    }
    lcd.setCursor(1, i);
    lcd.print(menu1[topMenuItem + i]);
  }
}
void loop() {
  if(!digitalRead(SW_pin)) {
    sw_count++;
    while(!digitalRead(SW_pin));
    if (sw_count>1) sw_count=0;
  }
  if (sw_count==1) hienthimenu();
  else main_screen();
  int newclk = digitalRead(CLK_pin);
  
  if(newclk!=lastclk) {
    lastclk=newclk;
    int dt=digitalRead(DT_pin);

    if(newclk==0 && dt==1){
      //lcd.setCursor(0,0);
      //lcd.print("Thuan");
      selectedItem++;
    }
    else if(newclk==0 && dt==0){
      //lcd.setCursor(0,0);
      //lcd.print("Nghich");
      selectedItem--;
    }
    if(selectedItem>=10 ) selectedItem=10;
    else if(selectedItem<0 ) selectedItem=0;

  }
  
  // put your main code here, to run repeatedly:

}