RadioBanter - View Single Post - QUESTION: Cheap Accurate Shaft Position Encoder

July 17th 05, 03:29 AM

wrote:

Roger Leone wrote:

Steppers have no output unless the shaft is moving. Steppers used this
way are really a velocity encoder and not a position encoder.
Regards,
Glenn AC7ZN

Glenn:

I'm sure that limits stepper motors to certain uses, but I think this
thread/post may be incorrectly titled. Unless I misunderstand the intended
application, I don't think a "position encoder" is what he is looking for.
Rather he wants something that, when rotated, feeds pulses to an up/down
counter for frequency synthesis. The position of the shaft is not important
as long as its rotation can be used to generate pulses for the counter.

Roger

Roger:

Yes you're right, that's exactly what I'm looking for... any ideas as
to where I might get such a beast?

Tim

For something inexpensive, consider the encoder in a wheel mouse. Also
most ball mice include two encoders for the ball.

craigm