Eleksmaker EleksLaser A3 Pro Laser Engraver 2500mW – Review, build and Test
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This a POV (Persistence of vision) Display based on an Arduino Pro Mini clone.
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!
The Keyes SR1y relay module is an active high relay module with an SPDT relay.
Maximum 10A 250V AC
Maximum 10A 30V DC
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How to connect an i2c 16×2 LCD display to an Arduino UNO tutorial.
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Parts list:
US: http://amzn.to/1tiesWE
Uk: http://amzn.to/1UHQuNF