4 open source boards using the CH221K
Real designs built with the CH221K, from public GitHub projects: a quick way to see how others power, decouple and connect it. Each board comes with its KiCad files, full parts list and a render — and you can simulate its firmware on HardLabs.
Pedal snow white autowah single
dvhx
60.8 × 116.5 mm112 parts2LGPL-3.05
ESP32KINK-box
FunDeckHermit
100 × 60 mm103 parts2LApache-2.02
RP2040/RP2350VNTR-65
FanieVenter
370 × 120 mm126 parts2LNo license1
PowerBox
Alvin-Alford
100 × 75 mm113 parts2LCC-BY-NC-4.01
The CH221K in open source designs
The gallery holds 4 open source boards using the CH221K from 4 GitHub repositories; a typical one measures about 100 × 95.8 mm and carries around 113 components.
100% are two-layer designs, the rest use four layers or more, and 50% carry an open source license.
The most starred is Pedal snow white autowah single by dvhx.
Microcontrollers on boards using the CH221K
What boards using the CH221K are built for
CH221K: common questions
Where can I find a CH221K reference design?
Each of the 4 boards on this page is a real design using the CH221K. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
Which microcontrollers do boards using the CH221K use?
Most are built on ESP32 (1) and RP2040/RP2350 (1).
How big is a typical board using the CH221K?
The median is 100 × 95.8 mm, and 100% are two-layer designs.
What is the most popular open source board using the CH221K?
By GitHub stars, Pedal snow white autowah single by dvhx, with 5 stars.
Can I simulate one of these boards using the CH221K before building it?
Yes. HardLabs turns a board's netlist and BOM into a working simulation, so you can boot and test firmware against it with no hardware on your desk.