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u/jyap

r/olkb r/ErgoMechKeyboards
Image 1 — [WIP] Pando - A progress report on my integrated STM32 split keyboard build (coming soon)
Image 2 — [WIP] Pando - A progress report on my integrated STM32 split keyboard build (coming soon)
Image 3 — [WIP] Pando - A progress report on my integrated STM32 split keyboard build (coming soon)
Image 4 — [WIP] Pando - A progress report on my integrated STM32 split keyboard build (coming soon)
Image 5 — [WIP] Pando - A progress report on my integrated STM32 split keyboard build (coming soon)
▲ 74 r/olkb+1 crossposts

[WIP] Pando - A progress report on my integrated STM32 split keyboard build (coming soon)

Working on a new split keyboard design called Pando - same layout as my Pando58 but with the MCU integrated on the PCB. Still iterating but making good progress.

In the first picture, you can see the footprint of the Pando left half compared to the footprint of the Pando58 right half with RP2040 Zero dev board and RJ45 interconnect.

What's different:

  • STM32F072CBT6 MCU direct on PCB (no more RP2040 Zero boards)
  • USB-C interconnect carrying I2C between halves
  • PCA9555 IO expander on the slave side - no MCU needed on the right half
  • ESD protection on all ports
  • Designed with Ergogen + KiCad
  • Assembled at home with stencil + hot plate

3.5 PCB revisions on the master side so far. Slave worked first try. More details in the full write-up:

https://julianyap.com/posts/2026-06-30/

u/jyap — 3 days ago