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How to make a musical instrument using an Arduino and a HC-SR04 ultrasonic distance sensor. The video embedded shows a demonstration. If that link doesn’t work, here’s an alternative link to the same video: Arduino Musical Instrument - YouTube NOTE: I used an obsolete Iteaduino Lite instead of an Arduino Uno, but an Uno will work better. If you have any issues, let me know in the comments and I will do my best to be tech support!”

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