I recently developed a 3D-printed third arm prosthesis (AI powered with EMG muscle sensor as input).
We built this project with a Friend for an AI robotics hackathon and won 13t place out of the 30 winning projects.
It’s heavily inspired by cyberpunk aesthetics and themes of human-machine augmentation.
Everything is open source so people interested can build it if they want!
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# /! More Info HERE for the Techies /!
LeCyborg
13th place winner of the Hugging Face LeRobot Hackathon 2025
The first [LeRobot](https://github.com/huggingface/lerobot)-powered AI cybernetic third arm, built using the 3D-printed [SO-100 robotic arm](https://github.com/TheRobotStudio/SO-ARM100).
# Control System
* Modified Lerobot/act policy to accept EMG input via Bluetooth serial
* Input comes from a battery-powered ESP32 + MyoWare muscle sensor
# Camera Input
* Wrist-mounted RGB cam
* Context cam mounted to a backpack via a custom 3D-printed adapter
# Hardware & Mounting
* SO-100 arm mounted to a backpack using a 3D-printed plate + M4 hardware
* Powered by a 12V 3S LiPo battery
# Open Source Everything
Docs, firmware, software, and STLs are all available here:
[GitHub – Mr-C4T / AB-SO-BOT](https://github.com/Mr-C4T/AB-SO-BOT)