Stampy Prototypes - RP2040 USB-C Controller Board for Handwiring

• RP2040 Microcontroller
• Compatible with both Cherry MX style switches.
• 26 I/O pins available for your rows and columns, or other IO functions such as LEDs and RGB strips
• 3 pins are preset for columns, and 1 pin is preset for a row
• Can cover well over 100 switches
• USB Type-C connector
• QMK-compatible

There are two sets of prototypes of the Stampy board. The differences between these prototypes vs. the final production version are the following:

Prototype 1 (Black)

• 16Mbit (2MB) of flash memory
• Lacks VBUS detection circuit (this really only matters a bit for split keyboard builds)
• Has access to GPIO9 (production version loses this pin due to it being used for VBUS detection)
• Lacks breakout pin for RESET

Prototype 2 (Purple)

• 8Mbit (1MB) of flash memory
• Has VBUS detection circuit on GPIO9
• Lacks silkscreen on top side of board (missing text on Keebio logo and missing elephant)
• 3.3V breakout pin is actually not connected to anything
• Marked with X3 on top side of PCB

For full information about the Stampy, see the Stampy Usage Guide.

Pin Assignments

4 of the pins are connected to the 3 switch locations in the following way:

• Row 0 - GPIO14 (All 3 switches are connected to Row 0)
• Col 0 - GPIO11 (Left switch)
• Col 1 - GPIO10 (Center switch)
• Col 2 - GPIO15 (Right switch)
• The reset button is connected to RST and 3.3V (not GND).

Switches

Due to the tight spacing of components, if you are using 5-pin switches, you will need to clip both of the plastic pins for the Center switch and the left plastic pin for the Right switch.