#define btnM 29
#define btnB 27
#define btnK 25
#define btnH 23

#define ledM 5
#define ledB 4
#define ledK 2
#define ledH 1


int tombolA = 0; // defult kosong 0/ kosong
int tombolB = 0; // defult kosong 0/ kosong
int tombolC = 0; // defult kosong 0/ kosong
int tombolD = 0; // defult kosong 0/ kosong

void setup() {
  Serial.begin(9600);

    pinMode(btnM, INPUT_PULLUP);
      pinMode(btnB, INPUT_PULLUP);
        pinMode(btnK, INPUT_PULLUP);
          pinMode(btnH, INPUT_PULLUP);

            pinMode(ledM, OUTPUT);
              pinMode(ledB, OUTPUT);
                pinMode(ledK, OUTPUT);
                  pinMode(ledH, OUTPUT);

                    // LED mati awal
                      digitalWrite(ledM, LOW);
                        digitalWrite(ledB, LOW);
                          digitalWrite(ledK, LOW);
                            digitalWrite(ledH, LOW);
                            }

                            void loop() {

                              if (digitalRead(btnM) == LOW) {
                                  Serial.println("Tombol M ditekan");
                                      digitalWrite(ledM, HIGH);
                                          delay(500);
                                              digitalWrite(ledM, LOW);
                                                }

                                                  if (digitalRead(btnB) == LOW) {
                                                      Serial.println("Tombol B ditekan");
                                                          digitalWrite(ledB, HIGH);
                                                              delay(500);
                                                                  digitalWrite(ledB, LOW);
                                                                    }

                                                                      if (digitalRead(btnK) == LOW) {
                                                                          Serial.println("Tombol K ditekan");
                                                                              digitalWrite(ledK, HIGH);
                                                                                  delay(500);
                                                                                      digitalWrite(ledK, LOW);
                                                                                        }

                                                                                          if (digitalRead(btnH) == LOW) {
                                                                                              Serial.println("Tombol H ditekan");
                                                                                                  digitalWrite(ledH, HIGH);
                                                                                                      delay(500);
                                                                                                          digitalWrite(ledH, LOW);
                                                                                                            }
                                                                                                            }