I need something to work as an input for a rotary device. It must be able to rotate continously, accurate to a degree of rotation, and so that any extra full rotation will have no effect on the input, a+360 is the same as a. With no limit of rotations as well.
So I have found no potentiometer that does that. And rotary encoders never have so many levels. I thought about doing it mechanically, and the using something kind of pressure potentiometer like this one https://www.sparkfun.com/products/8678 to transmit any rotation of my mechanical device to the surface of the potentiometer. This is the best I could come with, but if I could find something better, and specially less expensive, it would be great. Is there any standard device to do this?
Thanks in advance.
EDIT: Ok, so found, thank you to the answers, the rotary encoders that seem to be what I'm looking for. My doubt is: what I will be using as the input is the global position of the encoder, the degrees to which it's rotated, and not how it's being rotated, left or right, which is what the incremental that I've seen do. Are there any more types of these things? Or does an incremental one tell you how much it's rotating?