| Add me | Vyro VR Discord | SlimeVR Discord |
|---|---|---|
DIY nRF52840-based, full-body tracking (FBT) trackers, built on Smol Slimes. Originally created by Lyall.
Unlike Wi-Fi SlimeVR trackers, Smol Slimes (nRF trackers) connect via a USB receiver, offering:
- ⚡ Low power consumption
- 🔋 ~30+ hrs battery life with 120 mAh battery
- 🖥️ PC connection required for the SlimeVR server
Note
You must connect your receiver to a PC running the SlimeVR server.
Works with Standalone Quest VRChat via OSC bridge.
👉 Read the SlimeVR documentation if you’re new to this.
| Component | Notes | Link |
|---|---|---|
| ProMicro NRF52840 | Main MCU board | AliExpress |
| 2-pin Tactile Button (2mm) | 2.5mm button requires lid mod | AliExpress |
| 401230 3.7V 110 mAh LiPo Battery | Any similar-sized battery works | AliExpress |
| SlimeVR ICM-45686 Mumo Module | LSM6DSR is a cheaper alternative | SlimeVR Shop |
| Holyiot nRF52840+PA Receiver | Receiver board | AliExpress |
| 30mm Ibis Tracker Straps | Any 30mm strap works | VyroVR Store |
Warning
Buy at least 20% extra MCUs and IMUs.
Example: building 8 trackers → buy 10 boards.
Trust me, you’ll break some.
- 📄 Follow the official Smol Slimes assembly guide: docs.slimevr.dev/smol-slimes
- 🖱️ Flash firmware, solder components, and pair with your receiver.
- ⚙️ Configure your setup in the SlimeVR Server.
- 🧠 ManicQuinn – inspiration and internal sizing
- 🧱 Sorakage033 – case design inspiration
- 🐶 Lexie for their hard work on the firmware
- 🐺 **Lyall for being the GOAT for Stacked Smol Slimes
- 🟣 Everyone in the community who tested, broke, fixed, and bought these trackers.
Ibis Trackers © 2025 by Bris Ibis is licensed under CC BY-NC-SA 4.0.
For commercial licensing, contact [email protected].
PRs and improvements are welcome. If you break something, fix it. If you improve something, share it.
If you solder upside-down… well, that’s on you.
✅ Quick links: