Acoustic Position Measuring Device

[Charles Pax]

The problem with having an external speaker or microphone is that such a
solution does not simplify the situation. Sure, it would make the Freerunner
(plus some stuff) into a measuring device, but if we need a second piece of
hardware to take measurement, we may as well just carry around a tape
measure. Oh well.

So the theory seems plausible. When I get my Freerunner (when are they back
in stock?!) I'll have to do some testing. Thanks for the input, folks.

-Charles
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