Tiny Arduino Compatible borad smaller than a quarter
TinyDuino is a tiny size processor board from Tinyciruits allowing users to have a Arduino compatible for open source electronic programming. Its physical size is smaller than a quality and allow you to stack multiple in modulars to provide better performance. Allowing users to create their prototypes in an open sourced manners without having to buy high end micro-processors. The creativity of small electronics are now just limited by the creativity of the inventors but not the processor size.
https://tinycircuits.com/pages/tinyduino-overview
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