The Macropedal is based on an Adafruit QT Py RP2040 and runs code very similar to that of my Ultimate Adafruit Macropad. It was initially developed to be able to execute macropad-like-functionality using a pedal, but due to its generic 4-pin 3.5mm headphone jack it can be connected to any switch(es) (via a 3.5mm 4-pin breakout plug).

Because of the board's size a 35mm film canister is a perfect fit for an enclosure. Inside it the Adafruit QT Py RP2040 is connected to a female 4-pin 3.5mm headphone jack using the following pinout:

• Tip = A0
• Ring1 = A1
• Ring2 = A2
• Sleeve = GND

At startup the code detects at if a (mono) pedal is connected, which shorts Ring1 and Ring2 to ground. Different initialization code and sequences are activated depending on if the pedal is found or individual buttons are used.

All files and folders inside the CIRCUITPY folder are an exact copy of those on the board. Keycodes.txt serves as a quick-reference file for the keycodes. All of the code is placed in code.py. Some key variables are:

• KEYBOARD_LAYOUT: This is used to set the used keyboard-layout
  • 0 = US QWERTY
  • 1 = Belgian AZERTY
  • 2 = Modified Belgian AZERTY (numbers and characters on number-row swapped)
• PEDAL_SHORT_PRESS, PEDAL_LONG_PRESS, PEDAL_SHORT_DOUBLE_PRESS and PEDAL_SHORT_LONG_PRESS: If a pedal is found at boot, the keyboard sequences defined by these variables are executed upon certain pedal-presses
• BUTTON_TIP (and BUTTON_RING1 and BUTTON_RING2, but these are currently not implemented): If no pedal is found, the keyboard sequences defined by these variables are executed upon certain button-presses
• DEBOUNCER: Select which functionality to use when no pedal is detected
  • True: Use Debouncer() (available properties: value, fell, rose, current_duration, last_duration)
  • False: Use Button() (available properties: short_count, long_press, pressed, released)