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Hi Bojan. It would be good to have a computer focus control.It looks good. Few questions. How are you going to control stepper motor – RS232 or USB? I think that your control slider should be in the middle position. +50 – 0 -50. This way you will not need extra button to reverse motor direction. Also – what I found out with almost all stepper controllers. They do not provide option to switch the motor off. Holding current on most of the small steppers is in vicinity of 2A and that flattens the battery pretty quickly. Not talking about the motor heating up considerably.
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