Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
As nbucska said, it is often easier to use a permant magnet pick-up sensor, like those used to drive a speedometer , along with a slotted wheel, or gear. You can even use a metal disc that you have cut slots into. I have done this on trucks, using a drive shaft U-Joint 's four wrist pin ends as the "wheel", or a balancing weight on the drive shaft.
You may need to do some shaping of the waveform, since it will be similar to a sinewave, but that is easy to do.
They are called "inductive or magnetic pick-up senders " and you could even get one from an auto scrap yard for cheap.
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