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szilard1996
szilard1996
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After looking at many tutorials and trying many approaches with different Arduinos (Uno, because it's easyer to prototype) (and taking a short brake so I can try again from 0 with a new mindset) I made it work.

Before, I could do it because I was using Microcontrollers that had a 3/5V output also (ex. Uno, Mega, Nano, STM32, ESP8266, ESP32), so I could do a pull-up/down circuit, but because the Arduino Micro doesn't have such pins (it has only RAW as output, which can fry the board if it's externally powered) I had to use this method where I only use a GND pin and a Digital Input without any ressistors wired to the button.

Thanks for the answers and suggestions!

The new code (without the LED functionality):

#include "Keyboard.h"

// defining button pin numbers
// TODO: rename variables according to functionality
#define BUTTON_10 10
#define BUTTON_16 16
#define BUTTON_14 14
#define BUTTON_9 9

// giving them a first-state of HIGH
int previousButtonState10 = HIGH;
int previousButtonState16 = HIGH;
int previousButtonState14 = HIGH;
int previousButtonState9 = HIGH;


void setup() {
  // initializing the buttons as INPUTS with PULLUP (internal pull-up resistor from Arduino)
  pinMode(BUTTON_10, INPUT_PULLUP);
  pinMode(BUTTON_16, INPUT_PULLUP);
  pinMode(BUTTON_14, INPUT_PULLUP);
  pinMode(BUTTON_9, INPUT_PULLUP);

  // only for test
  // TODO: Move this only to the function needed when more functionality is added
  Keyboard.begin();

}

void loop() {
  // checking if any of the buttons were pressed and saving the state in a variable
  previousButtonState10 = checkButton(BUTTON_10, previousButtonState10);
  previousButtonState16 = checkButton(BUTTON_16, previousButtonState16);
  previousButtonState14 = checkButton(BUTTON_14, previousButtonState14);
  previousButtonState9 = checkButton(BUTTON_9, previousButtonState9);
}

// function: reads the button state and compares it with the previous state to find out if it was pressed or not
// params: buttonPin => the pin number of the button; previousButtonState => the state corresponding for each button
// return: it returns the red state, so it can be saved as previousState in the coresponding parameter
int checkButton(int buttonPin, int previousButtonState) {
  int buttonState = digitalRead(buttonPin);

  if (buttonState == LOW && previousButtonState == HIGH) {
    Keyboard.println(buttonPin);
    // some minimal debouncing
    // TODO: WIll be a problem when using millis() in the future
    delay(50);
  }

  if (buttonState == HIGH && previousButtonState == LOW) {
    // not needed, but some functionality could be added in the future
    // Keyboard.println("release");
    delay(50);
  }

  return buttonState;
}

Now I can work further on improving and extending the code to make the "Macro Board" project with mouse movement (and I also have to solder the buttons and LEDs to the board :P )

szilard1996
  • 15
  • 3