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→ultrasonic and IR rangefinders
One of many Sharp Rangers, with different effective ranges [http://www.acroname.com/robotics/parts/sharp_guide.pdf comparison guide]
==== can we sample sound? ====
* That is a good question.
* We can do some threshold detection: is a sound louder than a certain point.
* Can we make WAV files? I Don't Know...
== Analog Output ==
