A motorized camera slider controlled by an Arduino Uno with Adafruit Motorshield. The Arduino also manages the camera shutter to allow timed pauses in the motor movement for long-exposure still photos.
Code: https://github.com/stevenson-ryan/slider/blob/master/slider_base.ino
Wiring Diagram: http://rstevenson.me/images/slider_1.0.jpg
Materials:
iKan Carbon Fiber Slider: https://www.bhphotovideo.com/c/product/1194567-REG/ikan_sld_31_carbon_fiber_camera_slider.html
Arduino Uno: https://www.adafruit.com/product/193
Adafruit Motorshield: https://www.adafruit.com/product/1438
Stepper Motor: http://a.co/7LLJqWF
Belt: http://a.co/h3ki1RA
2.5mm TRS: http://a.co/cGwe5FA
2n2222 Transistors: http://a.co/9MCWb7V
Strip Board: http://a.co/j4PTyXu