Stack-chan

1,382 stars on GitHub.

Stack-chan — Palm-Sized Companion Robot

Stack-chan is a palm-sized, open-source companion robot driven by an M5Stack microcontroller and JavaScript firmware. Created by Shinya Ishikawa, Stack-chan sits on your desk, turns its head to watch you, expresses emotions on its built-in display, and responds through speech.

Source: https://github.com/stack-chan/stack-chan

Capabilities

• Servo-driven head gaze/tracking
• Emotive faces (happy, angry, sad) + fully customizable face expressions
• Speech synthesis
• Composable behaviors ("mods") — mix and layer: expressions, tracking, speech, M5Unit addon support
• Programmable in JavaScript on the Moddable SDK (embedded JS framework; no C/Arduino required)

Servo Paths — Pick Before You Print

Two mutually exclusive configurations that change both the case geometry and electronics:

Picking a path determines which STL set and which PCB you build.

Build Notes

• Requires a custom PCB — order Gerbers from JLCPCB/PCBWay (schematics/ directory in the repo)
• Modular 46-part printable enclosure (shell, bracket, feet, spacer, accessories: hat, backpack variants, Lego adapter)
• An official commercial M5Stack version (StackChan) is available; the open-source org fork is the reference for DIY

Metadata

• GitHub stars: 1,382
• Author: Shinya Ishikawa & community
• License: Apache 2.0

Links

• Firmware (firmware/)
• STLs (case/)
• Schematics + PCB (schematics/)
• Roadmap
• Demo video (YouTube, EN subs)