Hi,
Thanks again. This is for production. At beginning I thought it would be easier to count turns with a stepper, rather using a DC motor. Besides the stepper is very accurate and I can program it to run 1000, 1200 or 1500 turns per day. With a DC motor, speed increases with voltage, and the only way to count the turns will be, like you said, using a simple encoder. But will be this approach better to a product that intends to be produced ? Will this be cheaper ?
Well I think with a stepper I won't need a gearbox, because I can run it very very slowly. The main thing is that I need a simple and cheap solution, taking into account motor + driving IC.
Best regards,
Pedro Cardoso