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Solar Theremin With Arduino
(www.instructables.com)
This is a great project. I used to love arduino and supported them on principle. Until I stumbled on this:
The Untold History of Arduino by Hernando Barragán
Then I started using elegoo and a teensy, and they were very good for what I was doing. I am sure there are plenty of other alternatives as well.
Share your self-made stuff and half-baked projects here.
Also check out !diy@beehaw.org
There is also a related XMPP chat.