Perfect Pitch Machine
thingiverse
A pitch pipe made with Circuit Playground Express! This project turns Adafruit's Circuit Playground Express into a chromatic pitch pipe, perfect for vocalists and choirs. Chromatic harmonicas are often used to find the starting pitch. Now it's time to make one with Circuit Playground Express, along with a fun 3D printed case! Find a more detailed write up of the project over at Hackster: https://www.hackster.io/isaac-wellish/perfect-pitch-machine-c0d8da
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