4 layers18 × 13 mm
Mumo
kounocom/Mumo
A compact 13×18mm IMU module featuring the TDK InvenSense ICM-45686 6-axis IMU with integrated 32.768kHz clock and QST QMC6309H 3-axis magnetometer.
25 parts41CERN-OHL-S-2.0
2 layers40 × 33 mm
TrueBody - Tracker
LapisGit/TrueBodyBasic IMU tracker with SteamVR support.
- Size
- 40 × 33 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 64
- Pads
- 154
- Tracks, vias
- 213, 23
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 4 Jul 2026
- Updated
- 5 Jul 2026
Overview
TrueBody - Tracker is an open-source printed circuit board by LapisGit, from the LapisGit/TrueBody repository on GitHub, published under the MIT licence. It is a 2-layer board of 40 × 33 mm with 15 parts on 64 nets, routed with 213 tracks and 23 vias.
It is built around the ICM-45686. Its parts include 4 capacitors, 4 resistors, 4 ICs, 2 connectors and 1 switch. It belongs with the ESP32 boards of this library.
Main components
1README
README.mdTrueBody
Basic IMU tracker with SteamVR support.
Get the ICM-45686 Symbol and Footprint here for the project in KiCad: https://www.snapeda.com/parts/ICM-45686/TDK/view-part/
To-Do:
- 3D Printable Case
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 5.1k | Resistor_SMD:R_0603_1608Metric | R2, R3 |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric | C2 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | 10u | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 1uF | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | 3.3v regulator | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | 4.7k | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 4.7u | Capacitor_SMD:C_0603_1608Metric | C4 |
| 1 | Battery Charger | Package_DFN_QFN:DFN-8-1EP_3x2mm_P0.5mm_EP1.7x1.4mm | U1 |
| 1 | ESP32 | RF_Module:ESP32-S2-MINI-1 | U4 |
| 1 | ICM-45686 | ICM-45686(1):IC_ICM-45686 | U5 |
| 1 | JST | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J2 |
| 1 | SW_SPDT | Button_Switch_SMD:SW_SPDT_PCM12 | SW1 |
| 1 | USB-C Port | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J1 |
Questions
How big is the TrueBody - Tracker PCB?
It measures 40 × 33 mm and has 2 copper layers, 1.6 mm thick.
What parts does the TrueBody - Tracker use?
15 parts, built around the ICM-45686. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the TrueBody - Tracker KiCad files?
From the LapisGit/TrueBody repository on GitHub, at the commit this page was made from: the board is PCB/TrueBody - Tracker.kicad_pcb and its schematic PCB/TrueBody - Tracker.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the TrueBody - Tracker design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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