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petsound
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A pillow or plush toy that makes a sound when you pet it.
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petsound/README.md

README.md 581B
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Petsound

Petsound is a pillow or plush toy that makes a sound when you pet it. It has a velostat sheet that senses pressure, and we define “petting” as significant variaton of that pressure.

Video and “making of” photos

Schematic diagram

Pet detection is done by an arduino nano that sets and ISD1820 sampling boards’s P-L pin to high while petting is detected. The audio out of the board goes to a class D 2.5W audio amplifier.