The Frood

by 42. Keebs

Image of Board

The Frood is a high-performance and affordable drop-in replacement for the Pro Micro (used in many DIY custom mechanical keyboard kits), based on the Raspberry Pi RP2040. It is physically and electrically compatible with Elite-C/nice!nano as much as possible.

It follows the SparkFun Pro Micro RP2040 pinout with 5 extra pins (GPIO12-GPIO16) added along the bottom edge (like Elite-C), and USB data lines broken out in the top corners (like nice!nano).


  • Powerful dual-core Raspberry Pi RP2040 MCU
  • 2 MB on-board flash memory
  • Only 3.2 mm thick thanks to a mid-mounted USB-C socket
  • 500 mA linear regulator and resettable fuse
  • Combined Pro Micro / Elite-C / nice!nano / SparkFun Pro Micro RP2040 compatible pinout
  • 5 extra I/O pins (GPIO12-GPIO16) added along the bottom edge
  • 23 available digital pins for a maximum of 11x12 = 132 switches (using a standard matrix)
  • 4 pins configurable as analogue inputs
  • USB D+/D- broken out for use with an external USB socket/daughterboard
  • USB power sensing on GPIO19 for split keyboard side detection
  • UF2 bootloader for drag & drop programming with no extra software required
  • BOOT and RESET pads on the bottom of the PCB (in case )
  • Orange indicator LED on pin GPIO17



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CircuitPython 8.2.6

This is the latest stable release of CircuitPython that will work with the The Frood.

Use this release if you are new to CircuitPython.

Release Notes for 8.2.6

Built-in modules available: _asyncio, _bleio, _pixelmap, adafruit_bus_device, adafruit_pixelbuf, aesio, alarm, analogbufio, analogio, array, atexit, audiobusio, audiocore, audiomixer, audiomp3, audiopwmio, binascii, bitbangio, bitmaptools, bitops, board, builtins, builtins.pow3, busio, busio.SPI, busio.UART, collections, countio, digitalio, displayio, errno, floppyio, fontio, framebufferio, getpass, gifio, i2ctarget, imagecapture, io, json, keypad, keypad.KeyMatrix, keypad.Keys, keypad.ShiftRegisterKeys, math, microcontroller, msgpack, neopixel_write, nvm, onewireio, os, os.getenv, paralleldisplay, pulseio, pwmio, qrio, rainbowio, random, re, rgbmatrix, rotaryio, rp2pio, rtc, sdcardio, select, sharpdisplay, storage, struct, supervisor, synthio, sys, terminalio, time, touchio, traceback, ulab, usb_cdc, usb_hid, usb_midi, vectorio, watchdog, zlib

Absolute Newest

Every time we commit new code to CircuitPython we automatically build binaries for each board and language. The binaries are stored on Amazon S3, organized by board, and then by language. These releases are even newer than the development release listed above. Try them if you want the absolute latest and are feeling daring or want to see if a problem has been fixed.

Previous Versions of CircuitPython

All previous releases of CircuitPython are available for download from Amazon S3 through the button below. For very old releases, look in the OLD/ folder for each board. Release notes for each release are available at GitHub button below.

Older releases are useful for testing if you something appears to be broken in a newer release but used to work, or if you have older code that depends on features only available in an older release. Otherwise we recommend using the latest stable release.