"You can turn anything into an air mouse if you're brave enough"
— Piper, a.k.a. Pez
The app allows you to turn your Flipper into a USB or Bluetooth air mouse (you do need an extra module, see the Hardware section below)...
Using it is really simple:
USB, or pick Bluetooth and pair it with your PC;The custom module is using Bosch BMI160 accelerometer/gyroscope chip connected via I2C.
Take a look into the schematic folder for Gerber, BOM and CPL files, so you can order directly from JLCPCB.
The code is based on the original Bosch driver and an orientation tracking implementation from the Google Cardboard project
TL;DR: Use the code however you want, give credit where it's due, no warranty of any kind is provided.