const int ledM = 13;
const int ledO = 12;
const int ledB = 11;
int buttonM = 4;
int buttonH = 3;
int tekanbuttonM;
int tekanbuttonH;
int i = 0;

void setup() {
Serial.begin(9600);
pinMode(ledM, OUTPUT);
pinMode(ledO, OUTPUT);
pinMode(ledB, OUTPUT);
pinMode(buttonM, INPUT);
pinMode(buttonH, INPUT);

}

void loop() {

tekanbuttonM = digitalRead(buttonM);
if(tekanbuttonM == 1){
  i++;
  delay(300);
}

tekanbuttonH = digitalRead(buttonH);
if(tekanbuttonH == 1){
  i--;
  delay(300);
}

switch(i){
  
  case 1:
  digitalWrite(ledM, HIGH);
  digitalWrite(ledO, LOW);
  digitalWrite(ledB, LOW);
  break;

  case 2:
  digitalWrite(ledO, HIGH);
  digitalWrite(ledM, LOW);
  digitalWrite(ledB, LOW);
  break;

  case 3:
  digitalWrite(ledB, HIGH);
  digitalWrite(ledO, LOW);
  digitalWrite(ledM, LOW);
  break;

  default:
  break;

}
Serial.println(i);


}