### Petsound
[Petsound](https://www.discogs.com/release/2557998-The-Beach-Boys-Pet-Sounds) 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](https://tooot.im/@zvinj/113906516287736785)

![Schematic diagram](petsound_bb.png)


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.