Keyboard Builders' Digest / Projects
Suutari20
An RP2040-based modular macropad system by Juho T.: the Suutari20 using TRRS sockets and jacks.
Published December 10, 2025
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Juho T. aka Squalius-cephalus, designer of the Silakkas, made a modular macro keyboard framework. The RP2040-based Suutari20 uses TRRS sockets and supports 3.5mm jacks from TS to TRRS.
I wanted a macro keyboard that I could quickly design and build modules for. The result is Suutari20, which uses TRRS connectors (don't worry, it won't short circuit like silakka54) and modules consisting of just a few components (switches and TRRS jack) – Squalius-cephalus.
The TRRS connector can be split into three mono connectors using a splitter. This allows you to connect three foot switches to one port for example.
Features
- various modules (e.g. a 3-key hotswap MX one)
- Raspberry Pi Pico (or compatible clone)
- PJ-320A connectors
- QMK/Vial firmware
- 3D-printed case
Resources
With detailed documentation:
- https://github.com/Squalius-cephalus/suutari20/
- https://github.com/Squalius-cephalus/suutari20/wiki/Getting-started
Published on Wed 10th Dec 2025. Featured in KBD #203 (source).
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