kmk_firmware/hardware

KMK Hardware: Devices for use with KMK

Itsy Bitsy to Pro Micro pinout adapter

This board adapts the pinout of a Circuit Python compatible Adafruit Itsy Bitsy M4 Express to that of the Sparkfun Pro Micro to allow the Itsy Bitsy to be used with the many keyboards that support the footprint of the Pro Micro.

Pin mapping

Pro Micro Pin	Itsy Bitsy Pin
TX0/PD3	TX
RX1/PD2	RX
GND	GND
GND	GND
2/PD1	SDA
3/PD0	SCL
4/PD4	13
5/PC6	12
6/PD7	11
7/PE6	10
8/PB4	9
9/PB5	7
Raw
GND	GND
RST	RST
VCC	USB
A3/PF4	A0
A2/PF5	A1
A1/PF6	A2
A0/PF7	A3
15/PB1	A4
14/PB3	A5
16/PB2	SCK

So how do I use it?

1. The pads for the Pro Micro footprint are circled on the underside of the board. Solder male headers into these pads on the underside of the board (the same side as the markings) so that the pins extend "downward" so that they can be plugged int the keyboard.

2. The remaining pads are for the Itsy Bitsy. Assuming height is a concern, rather than desoldering male headers into the Itsy Bitsy and female headers into the adapter board, instead place the long side of male headers through the Itsy Bitsy pads from underneath the board so that they protrude through he pads on the top of the board and solder them in place. Make sure to keep the headers perpindicular to the surface of the board.

3. Once soldered, place the Itsy Bitsy board over the headers that are now protruding upwards so that the headers go through the pads of the ItsyBitsy and solder in place.

4. Trim the ItsyBitsy headers as needed with flush cutters.

License, Copyright, and Legal

The files in this directory are licensed CC BY-SA 4.0 while the tl;dr is linked, the full license text is included in LICENSE.md in this directory.