Hacksby = Hack-a-Furby project on github:

Hasbro’s Furby toy (year 2012 model) uses audio protocol to communicate with other nearby Furbys and with the official ‘Furby’ applications for iOS and Android.

This project is an educational attempt to analyze and re-create the audio protocol and communicate with Furby using computer in a search for some easter eggs or otherwise undocumented features.

At its current state, the project includes:

• Description on the audio protocol (see below)
• [An incomplete] description of various Furby commands
• An Perl library and scripts that can generate and play WAV files with arbitrary commands (to talk to Furby)
• A script that can decode commands from a provided audio stream (to interpret Furby’s responses)

Video above of our Furby Teardown.