Cool! I hadn't seen that project before, although I'd seen a few other telemetry-over-audio solutions. They usually use simple FSK just like the "real life" he

Cool! I hadn't seen that project before, although I'd seen a few other telemetry-over-audio solutions. They usually use simple FSK just like the "real life" helicopter in the article. Here's an example of a common simple protocol: http://www.flytron.com/pdf/audio_modem.pdf http://www.flytron.com/pdf/audio_modem.pdf