Re: Minimal inductive proximity sensor?

Reflection sensor? Farnell has about half a page of "reflective optical
sesnsors", most of them costing a bit under $10 each in small
quantities.

If the cast iron wheel had any significant residual magnetism, you
might be able to do something with a linear Hall effect sensor and
comparator, but it would be more expensive,

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Bill Sloman, Nijmegen

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