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Absolute encoder for anemometer direction indicator?

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Joules:
It can also be printed and wrapped round a cylinder or shaft to make a much more compact sensor.

gerritv:
If you need more resolution, this article describes how to generate larger numbers and decode back to something usable.
https://en.wikipedia.org/wiki/Gray_code

Gerrit

John Hill:
Thanks for the comments.

John

John Hill:
The first tests...



Somewhat like a sine wave but not perfect,  maybe there is scope for tweaking the shape of the pole piece?

BillTodd:
I've posted this before but it is such a simple clever idea (not mine obviously ) I thought it worth repeating:

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