Do you mean an optical shaft encoder?
Do you mean an optical shaft encoder?
It is called a pot without stops
Anything digital generates pulses, (counts) not voltage. Here is an example of a low cost encoder used as a manual digital pulse source available from Digikey:
(snip)
The optical encoders are more expensive than the contact types, but there are some inexpensive ones available from Digikey. $20.55
I'm trying to find the type of dial that you can turn in one direction or the other without it stopping (unlike a potentiometer). I have no idea what this part is called. Any thoughts?
Thanks.
I think the optical shaft encoder would do what I want, but they appear to be fairly expensive. The device I'm thinking of probably generates some type of current when the knob is turned, where the current is proportional to the rotation speed. I imagine that they're pretty cheap since I've seen them on a variety of cheap electronic devices such as the volume/digial tuning knob on radios.
or
what
What you are looking for is a rotational encoder, or gray code encoder. There are some low cost ($3 to $6) ones out there but some of them really suck (they ar not sturdy, go clack clack clack, and lose contact after a while). Optical encoders are much nicer, but incredibly expensive. $125 and up. You can get those even with an RS232 interface that returns relative (I moved 20 degrees) or absolute values (I am at 24 degrees).
see:
Low end:
High end:
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50 cent electric gear motor with a knob on the end?Al...
"Kruminilius W." wrote in news:kJTue.69$ snipped-for-privacy@newsreader1.level.com:
There are optical shaft encoders, or cheaper mechanical encoders like are used to adjust the display on some computer monitors. There are variable capacitors. Also popular is the metal shaft with a knob on it, which moves a dial string.
What exactly are you wanting to use this dial you are looking for for...
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what
or a knob with a loose grub screw, i like the cheap 50cent dc motor idea best
Colin =^.^=
What about those wheels in a balled computer mouse??? they do what you want to do, but they are fragile.
I don't think so. The poster appears to be looking for a device that indicates relative rotation, not absolute position. His example is of a digital volume knob on an inexpensive stereo. He's got some good answers on that - most intriguing to me is the electric motor (generator, actually, since mechanical motion is producing current) idea. I think using one of the cheaper optical encoders is probably the simplest implementation.
-- Al Brennan "If you only knew the magnificence of the 3, 6 and 9,
Yep. Those are the optical encoders that have been discussed. I think the OP wants a more rugged human interface - something to be moved with the fingers?
-- Al Brennan "If you only knew the magnificence of the 3, 6 and 9,
-- Unfortunately, it won\'t work since there\'s no way of determining direction.
Good luck, John
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