This can be done visually for now but if problems occur you may have to resort to probing with a multi meter. Check that all solder joint are well formed and that no excess solder is shorting any of the pins.See the left most diagram on the 3rd image. Be sure to split the copper tracks on the veroboard between the row of pins on the left / right hand side of the arduino and the step stick motor driver.Follow the visual circuit diagram / pin map that I created and you should be fine. There is very little to say in this section. I could really do with my own 3D printer! The vote button is just right of the title, at the top of the page. If you found this instructable useful, inspiring or interesting please consider voting for it in the 3D printer contest. It looks like a really nice piece of kit, however it is far beyond what I was willing to spend with my limited filming experience. It later came to light that a start-up on kickstarter had already implemented this design and had started the patent process. The beauty of this design is that the two slider heads move in different directions and allo w a camera to move further for a given length slider. The dual rail design was inspired by a cliff elevator. The last 2 clips were done by combining this project with my earlier D40 remote hack to create a moving time lapse. The video below was shot at Dartmoor National Park using this slider. Using both 3D printed parts and parts used in 3D printers, this slider costs a fraction of the price of commercially available sliders and can be modified to suit you.
In this step by step guide you will lean how to make your very own arduino controlled, motorized camera slider.