I'm going to rotate my Dell1914 monitor using a motor. Today I got the signals coming into the arduino and turning on LEDs for forward and reverse.
I've got a dia38mm toothed pulley and a 9mm toothed belt. Which will drive onto a diameter of say 380mm giving 10:1 reduction. Hence 4-8 rpm hopefully which gives 2s -4s for the quarter turn I need.
I was going to ask about using a simple fixed voltage drive with relays and micro switches at the ends of travel vs varying the voltage with a transistor? circuit. But now I've seen some motor controllers such as this. https://www.ebay.co.uk/itm/153876126183?
To get a variable speed can I replace the variable pot with a voltage out of the arduino?
My thought was to ramp the voltage up and then reduce it after a time period to give a nicer sound to the motion. Still with a single switch to limit the travel/stop the movement in the right place.
Alternatively I was wondering about a scheme that has an earlier switch to signal start of slowdown (maybe linked to some mechanical resistance too).