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Hall Effect Tachometer

by tkbletsc, published

Hall Effect Tachometer by tkbletsc Nov 9, 2015
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Summary

As I was pricing rotary encoders, I realized that I could fabricate a rudimentary encoder/tachometer using just a 3D printer, magnets, and Hall Effect sensors (which detect magnetic field). See this hastily made YouTube.

This customizer makes the disc for basically any magnets and motor you have around.

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Nov 11, 2015 - Modified Nov 11, 2015

Are the hall effect sensors directional?
If so something like this would work for a single sensor to determine direction...
Clockwise put 6 sensors North facing sensor, S facing sensor, N, N, S, S.
(I know you already know this... I just wanted to look smart)
Then any of these patterns determine clockwise:
NSNNSS SNNSSN NNSSNS NSSNSN

any of these patters determine anti clockwise:
SSNNSN SNNSNS NNSNSS NSNSSN

I dunno... (Nice lab.)

Unfortunately not -- they just trigger when the magnetic field is above a certain threshold. The only polarity issue I had was that they seem to like to trigger for one polarity more than the other.

Comments deleted.

Could you produce similar results with a reed switch?

Provided it can switch fast enough, I don't see why not.

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