//INPUT AND OUTPUT
#define button_up 3
#define button_down 2
#define button_ok 4
#define led_1 5
#define led_2 6
#define led_3 7

//VALUE
#define list_id 1
void setup() {
  pinMode(button_up, INPUT);
  pinMode(button_down, INPUT);
  pinMode(button_ok, INPUT);
  pinMode(led_1, OUTPUT);
  pinMode(led_2, OUTPUT);
  pinMode(led_3, OUTPUT);
}

void loop() {
  if(button_up==LOW){
    list_id = list_id-1;
  }
  if(button_down==LOW){
    list_id = list_id+1;
  }
  if(button_ok==LOW){
    digitalWrite(led(list_id), LOW);
  }
}