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Do you have a HalloWing left over from Halloween? If you have a left over black cat as well, this is the project for you!
This device has many names: function generator, waveform generator, and signal generator. As we all know... you can't stop the signal.
Use one pair of glasses for normal, bright, and dark conditions, controlled by a Circuit Playground Express
You can program the new SAMD51 boards in Makecode, C++, and Python. How about Lisp or Forth? Why not?
Control a Circuit Playground Express based robot with your hand motions and another Circuit Playground Express.