Adding a battery and enclosure are optional as well. You might also consider building a shield for the Uno and include the appropriate components: 10 kilOhm resistor, piezo buzzer and photocell (light dependent resistor). Other possible variations of this project may include other boards such as the Micro and Leonardo. Instead of the Arduino Uno, I used a Nano board. ![]() The Nano theremin is a variation of the light theremin project described in the book accompanying the Arduino starter kit.
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