BuildBB-0162

co-arm: a 3D-printed four-joint camera arm that Codex can see through and move

co-arm is a 3D-printed four-joint camera arm built from ST3215 serial-bus servos, an ESP32 servo HAT and a Raspberry Pi 4. Codex previews each move before running it, then reads the joints and camera to check the result. The author says Codex has moved the physical arm; demo media is not published yet. The software is source-available for noncommercial use.

Open original source github.com · over-TT

Claimed
Why this evidence label?

Author states Codex moved the real arm and captured the desk through its camera; demo media is not published yet.

How we check entries
Preview image for co-arm: a 3D-printed four-joint camera arm that Codex can see through and move
The source's own preview image, from github.com.

Briefing

The Pi works out joint targets and sends them to the ESP32, which drives the servo bus and reports positions back; the camera gives a separate view of the result. Codex and the dashboard use the same route. An early version tracked the base by adding up relative moves and lost its position. The author switched to the servo's absolute multi-turn reading and a physical zero mark.

The upper arm is 180 mm long and the elbow-to-camera tip 220 mm, and all 12 printed parts are in the repository. The README lists what the build package still lacks: base bearing details, print settings, a wiring diagram, final power details and photos. An Isaac Sim model runs the same software without the arm.

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Repository facts

Repository facts for over-tt/co-arm, from the GitHub API
Repositoryover-tt/co-arm
Stars0
LicensePolyForm-Noncommercial-1.0.0
LanguagePython
Last push11 Oct 2026 18 d ago

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