Ok, here's my problem:
I need to create a needle that can rotate continously in both directions and an infinite amount of "loops". I guess the ideal is to use a servomotor, isn't it? I couls use steppers but I want to keep the price as low as possible.
The problem is tht the most important thing is the precission of where the needle is pointing. I have found already several links that explain how to modify servos so they can run continously, but I lose that precision I'm looking for. I am asking whether there exists a way to achieve this. The only thing I can think of is using some kind of sensor that tells me where the needle is pointing so I can stop the motor when I want it to. Inexpensive sensor if possible...
Does anybody know a solution for my problem? As my last choice, I would use a cheap stepper of about 7.5 degrees of min. rotation and a gear to get a better resolution, although even those cheap steppers are about 8$ while I can get cheap servos for a third of that.