Audio IO with Arduino

[Martin]

As discussed over tacos.

This might be considered AVR programming as registers are programmed
directly.

http://interface.khm.de/index.php/lab/experiments/arduino-realtime-audio-processing/

We added PWM voice output to the HacDC high altitude balloon APRS tracker.
 Once the tracker had stopped descending it would broadcast it's call and
lat/long to help locate it on the ground (or in a tree).

Martin KB3UJQ
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