Stampy - RP2040 USB-C Controller Board for Handwiring

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Heavily inspired by the Postage Board Mini by LifeIsOnTheWire, Stampy is an RP2040-based version of it for doing a handwired build.

What is Stampy?

Stampy is a controller board meant to assist with the construction of a hand-wired keyboard. Instead of using some other daughterboard like the Pro Micro, Elite-C, etc., Stampy gets soldered directly to 3 switches, meaning that no extra space below the controller is needed.

Goes great with the Amoeba Single-switch PCBs!

Want to save a bit of money? We've also got perfectly usable prototype versions of the Stampy available at a discounted price.

  • RP2040 Microcontroller
  • 16Mbit (2MB) of flash memory
  • 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

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

Pin Assignments

Stampy has the following GPIO pins available: 0-8, 10, 11, 14-28.

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).


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.