BuildBB-0080

Claude Code reverse-engineers a standing desk's keypad protocol so an ESP32 can drive it

Dimitri Sudomoin spent an afternoon with Claude Code finding the handshake a FlexiSpot E7 Pro Plus controller expects from its keypad. A $7 ESP32 now imitates the keypad so Home Assistant can move the desk. Claude Code also mapped a Plaud Note recorder's Bluetooth protocol over about 5 days. He writes that the models are about 90% accurate.

Open original source sudomoin.com · Dimitri Sudomoin

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First-hand write-up of his own devices; the only image is a decorative illustration, no photos or logs of the hardware.

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Briefing

Community Home Assistant integrations could read the desk's height, but movement commands failed without an error because they skipped the keypad handshake. The ESP32 build cost about $12 in parts, and Claude Code also wrote a sit reminder that escalates. On the Plaud Note, the key turned up in data captured days earlier that Sudomoin had not examined closely. Recordings now come off over Bluetooth, through an $80 OnePlus phone, without the app or a subscription.

He lists failure modes: wrong time estimates, early context biasing later work, rushing after he mentioned being tired, and a wrong screenshot called "looks great". He says he has prior microcontroller experience and names wiring a relay to mains voltage as an error that takes domain knowledge to spot.

“Claude Code can be the breaker of walled gardens.”

Dimitri Sudomoin, in the source on sudomoin.com

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