https://github.com/dlktdr/HeadTracker
https://headtracker.gitbook.io/head-tracker/ for the instructions now
Here is a list of the other things I've used - you can get them from lots of places:
Ardunino 33 BLE board: https://store.arduino.cc/arduino-nano-33-ble (you can get them from lots of places)
6mm x 6mm PCB momentary switch: https://uk.farnell.com/schurter/1301-9317/switch-smd-push-7-3mm/dp/1217767
2s Balance Connector for power: http://bit.ly/3tabS4s
3.5mm Stereo PCB mounted jack (optional): https://uk.rs-online.com/web/p/jack-plugs-sockets/9131030/
Link to the 3D printable case I made for it: https://www.dropbox.com/s/a9qwhhksfw9berv/DIY%20HeadTracker%20Case%20v0.1.stl
My video on setting up head trackers in OpenTX: https://www.youtube.com/watch?v=_p8_1v9-3D8
My video on setting up head trackers in INAV: https://www.youtube.com/watch?v=qAgFBHg8LiI
My 3D printable pan and tilt setup:
https://youtu.be/CBHTAzudm68
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