2024 christmas card "North Pole Circuit"

Ch32 based christmas card with 8x8 screen, sound and capacitive buttons

Fast Desktop Switching Device

USB host/device implementation using PIO of raspberry pi pico (RP2040/RP2350).

Analog seven-band spectrum bargraph with op amps.

Open source minimal stack for the ch32 line of WCH processors, including the ch32v003, a 10¢ 48 MHz RISC-V Microcontroller - as well as many other chips within the ch32v/x line.

Open Source Soldering Iron firmware

Puya PY32F002A PY32F003 PY32F030 GNU GCC SDK, template and examples

24 channel, 100Msps logic analyzer hardware and software

Use a raspberry pi pico (rp2040) as a logic analyzer and oscilloscope with sigrok

Some ultra low cost, unique layouts mechanical macropad using CH552G

All CASE christmas cards over the years

Useless keyboards