Voice Over IP slot car racing? Come again? Apparently, this project takes advantage of Asterisk to take in the phone data and spit that out to a Java based softphone. This softphone takes in a SIP stream and then measures the waveform amplitude data (volume). The louder you speak, the faster your VoIP-enabled slot car goes.
Just don't take a breath or pause or your slot car will stop. The amplitude data is sent serially down to an Arduino board.I remember playing slot cars in a friend's garage, which was a lot of fun. Somehow the thought of screaming into a phone to make your slot car go faster might get a little old after awhile. Still, might be fun. Pretty amazing what fun and interesting projects you can do with open source Asterisk!
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great hobby