This is a MouseMover. It is designed to periodically move your mouse to keep your computer from going to sleep. There are numerous alternatives but none of the ones I found met my needs. I needed something that was completely stand alone from the target machine. That meant no software to be installed or run and nothing could be plugged into the USB.

This uses a 28BYJ 48 stepper and driver. These are easily found on Amazon, ebay and various other places for just a couple of dollars.

I used an Arduino Pro Mini (5 volt version) that I had laying around but others would work as well.

I'm powering my unit from a USB power adapter/charger but any 5VDC power supply that can source 250mA should work.

Two M4 x 5mm screws are needed to mount the stepper Four M4 x 12mm (or longer) are needed to assemble the pieces of the box together.

I opted not to design in board mounts for the circuit boards. I used a couple of pieces of heavy duty double sided tape to stick them to the underside of the box.

I included the Arduino sketch that I am using. You can easily change delays and how far the rotation is for each move.

Assembly

1. Mount the motor in the Base
2. Press the rotary table onto the motor shaft. It is keyed to fit the flats on the motor shaft. Make sure the rotary table is fully seated on the motor
3. The spacer goes between the base and Top Cradle
4. Put the top cradle on and use the four M4 x 12mm screws to hold everything together.
5. Wire everything up according to the wiring diagram
6. Plug it in and have fun.