Reversing engineering a 2.4GHz remote control @rgerganov

Radoslav Gerganov posts the methodology used to decode the GFSK radio signals from a toy car remote.

I have an old project on Github called rf-car for controlling a radio car with HackRF. A few months ago, my daughter received a new RC car made by Dickie Toys:

This car was faster than the previous one and it was more fun to play with. I thought it’d be great if I can add support for it in the rf-car project and the fun began.

The go-to tool for signal analysis is, of course, inspectrum. I have successfully reverse engineered the ASK/OOK signal of my old car with it but I didn’t have any experience with FSK signals.

There are 146 symbols (bits) in each packet. The packets in each batch are the same.

See the video below and the blog post for more.


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