Open-source & free

Cool projects you can actually build tonight

OpenGizmo is where small hardware ideas get documented. Open-source builds, honest notes, and the kind of details you wish you'd found before starting.

What's in here

A growing collection of ESP32 projects and the notes that go with them.

Real builds

Open-source ESP32 projects with schematics, code, and enough context to actually replicate them.

Honest notes

The stuff that took hours to figure out — wiring quirks, gotchas, and design choices explained without fluff.

Fresh posts

New experiments, half-baked ideas, and project updates as things get built and broken.

Start poking around

The blog is the best starting point — grab a coffee and see what's been cooking.