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1  Using Arduino / Sensors / Re: Using a motor as a sensor on: April 29, 2011, 11:50:54 am
I'd like to have direction sensing as well -- this is for an audio synthesis application, and the direction will be utilized as an additional control parameter. I've ordered a detentless rotary encoder to experiment with, but if you have further suggestions or ideas they are most welcome!
2  Using Arduino / Sensors / Re: Using a motor as a sensor on: April 29, 2011, 11:27:50 am
Whoops, obvious typo! You're right, I meant to say brushed! Thanks.
3  Using Arduino / Sensors / Re: Using a motor as a sensor on: April 29, 2011, 10:55:00 am
Well, it is to be used as part of a hand-operated crank -- imagine, for instance, something like a hurdy gurdy's wheel.
4  Using Arduino / Sensors / Re: Using a motor as a sensor on: April 29, 2011, 10:19:31 am
Thanks very much for the helpful replies.

The motors I've experimented with are common brushed DC motors. The potential divider suggestion works fairly well, although with the motors I have here the output range is fairly small.

I initially was drawn to the idea of using motors because of their feel while cranking -- they are smooth and have very little friction, resulting in continued motion after cranking and releasing, for instance.

However, perhaps a better idea would be to use as smooth as possible a detentless rotary encoder? Are there specifications addressing this which I could consult on a data sheet to find an appropriate model? Or are there specific suggestions for such an encoder? Thanks again.
5  Using Arduino / Sensors / Using a motor as a sensor on: April 28, 2011, 05:21:15 pm
I'm interested in using a DC motor as a sensor to measure hand-cranking speed. It seems like I could wire one lead of the motor to ground, wire the other lead to the sensor input with a resistor going to +5V. Is additional circuitry needed?

Also, this method only measures one direction of rotation. Are there suggested methods for sensing both directions of motor rotation?

(I also am using a rotary encoder as a sensor, but for reasons of touch and response I would like to have a separate motor sensor.)

Thank you very much.
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