Over the summer I built some Slime VR trackers for myself. It’s now December and I still haven’t used them very much personally. I wrote about the part selection at the time but I never explained how to put firmware on the trackers. SlimeVR is written with the ESP32 family of microcontrollers in mind. I chose a board with the very capable ESP32-S3 for my build. There are always slight variations across different microcontrollers, even with similar names, and even from the same vendor.

These are my new VR trackers. This DIY build of SlimeVR trackers can be assembled with (maybe*) no soldering. If you’re like me and want to put together your own set of SlimeVR trackers, I’ll tell you about the parts I selected and show you my case design. Parts My part selection uses fewer parts than some others I’ve seen. The Adafruit feather microcontroller (MCU) boards often include a LiPo charger and “fuel gauge” IC.