A lot of folks like using Adafruit parts for their Keeb builds – but with the itsybitsy not being pin-compatible with the pro micro pinout, it really wasnt very easy without some sort of adapter plate. now we’re seeing lots of people use circuitpython for keebs, which is awesome! why not try our hands at spinning up a pro-micro-compatible RP2040 board? the RP2040 is plenty powerful, low cost and makes for an excellent keeb driver chip. we tried to mix together the things we liked most about the sparkfun pro micro rp2040 (Qwiic/QT I2C port on the end, so good!) the Elite-C (castellated pads & pins for D+ and D-!) and our existing 2040 boards (boot button can be used for user, 8MB QSPI flash, onboard NeoPixel, jumper for skipping the diode/fuse for high power RGB LEDs or USB hosting). we even got it to all fit on a 2 layer PCB with 7/7 routing – just needed to make the smallest caps and resistors 0402. ground plane didnt suffer too much either – take a look! (hat tip to JLCPCB who fixed up their gerber render to manage castellated pads)

Music video version …