Great little video from Vimeo member Stavros Koulis showing the build process of a Time Lapse Skater Dolly using an arduino controller. You may not require the need for a skater, but the parts list and instructions might be a good start for adding motion control to even a slider. For a complete parts list and build instructions, check out the article at https://nikondslrtips.com/15mm-rig-motion-controlled-timelapse-skater-dolly/.