Here is a gif showing it in action, once the motion is detected, the strip slowly lights up directionally from bottom to top, how is this achieved? I can't seem to find how this is done: Looping GIF link
Electrical Lighting LED Stairs Design – Achieving a Stairway Chaser Effect with LED Light Strips
designelectricalledlightingstairs
Best Answer
Here is the website that the video came from.
tinker-fun.com/DigitalLEDStairlighting
Note that this DIY project requires electronics and software knowledge. The website has fairly detailed hardware instructions. The designer has not posted the full software yet. Pieces of the software are available from various open sources.