There are plenty of versatile motorized camera sliders available on the market these days. Care to build one on your own? Adafruit has shared a project that shows you how to do just that. It is all about building a camera slider with Bluetooth control and smooth operation.
The Motorized Camera Slider MK3 can be built with an Adafruit METRO 328, Motor Shield, Bluetooth Module, Stepper motor, timing belt, pulley, and other components. The new version has been redesigned to offer smoother motion.