Example Code

Of course, we don’t just leave you with the board and a “good luck”, here’s some example code to get you started.

The BBQ20KBD interface is compatible with the one in the Keyboard PMOD, you can use the same libraries and code.

CircuitPython

You can find the CircuitPython library here, additional libraries are needed, see the README.md for more details. The code has been tested with CircuitPython 7.0.

import board
from bbq10keyboard import BBQ10Keyboard, STATE_PRESS, STATE_RELEASE, STATE_LONG_PRESS

i2c = board.I2C()
kbd = BBQ10Keyboard(i2c)

kbd.backlight = 0.5

while True:
    key_count = kbd.key_count
    if key_count > 0:
        key = kbd.key
        state = 'pressed'
        if key[0] == STATE_LONG_PRESS:
            state = 'held down'
        elif key[0] == STATE_RELEASE:
            state = 'released'

        print("key: '%s' (dec %d, hex %02x) %s" % (key[1], ord(key[1]), ord(key[1]), state))

Arduino

You can find the Arduino library here as well as through the Library Manager in the Arduino IDE.

#include <BBQ10Keyboard.h>

BBQ10Keyboard keyboard;

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

  keyboard.begin();
  keyboard.setBacklight(0.5f);
}

void loop()
{
  const int keyCount = keyboard.keyCount();
  if (keyCount == 0)
    return;

  const BBQ10Keyboard::KeyEvent key = keyboard.keyEvent();
  String state = "pressed";
  if (key.state == BBQ10Keyboard::StateLongPress)
    state = "held down";
  else if (key.state == BBQ10Keyboard::StateRelease)
    state = "released";

  Serial.printf("key: '%c' (dec %d, hex %02x) %s\r\n", key.key, key.key, key.key, state.c_str());

  // pressing 'b' turns off the backlight and pressing Shift+b turns it on
  if (key.state == BBQ10Keyboard::StatePress) {
    if (key.key == 'b') {
      keyboard.setBacklight(0);
    } else if (key.key == 'B') {
      keyboard.setBacklight(1.0);
    }
  }
}

Last modified May 7, 2022