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Looking for an Optical RPM module


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I have built a device that has a spinning rotor that I would like to display its rpm. I have been using a handheld laser device that bounces off a reflective strip on the rotor (see pic).

I’m looking for a permanent module attached to the base plate with a small display unit I can mount and with any electronics put on the PCB I’m preparing.

Magnetic options are complicated as the rotor has 5 Neo magnets in it so an optical method is preferred.
 
Any ideas?
 
Thanks
 

 

1BE6E780-77B9-4CE7-9568-ACDA31F2BD92.jpeg

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