The Micro Gherkin is billed as the tiniest Pi Pico powered keypad. Both the switches and the Pi Pico are surface mounted, back to back.
The 30 switches were selected from the jlcpcb.com SMT parts inventory. I had 5 boards made and assembled. The BOM is only 3 parts; switches, Pi Pico and the 3 tool marks (registration holes). JLCPCB supplies and SMT assembled the switches.
The board is running PRK firmware. PRK is very easy to use. It mounts the board as a USB drive so you can directly edit the configuration file with a text editor, much like KMK firmware/CircuitPython. I used the prk_pipigherkin configuration. The only change needed was to the pin definitions.
Read more about this in the Blog Post and information is available via Git.
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