This was a fun experiment measuring the rotational speed (rpm) of a fidget spinner using an Arduino Uno, a hall effect sensor and a neodymium magnet. Then seeing just how fast I could make the spinner spin with a shop vac!
![8431 rpm Fidget spinner](http://www.techydiy.org/wp-content/uploads/2017/06/8431-rpm-pic.jpg)
8431 RPM Fidget Spinner – Arduino Tachometer
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