Project 1 Dual axis solar tracker, Arduino Uno and Lego blocks. Basic prototype design of a dual axis solar tracker. Build with Arduino Uno and out of Lego Blocks I was going through my files and all came across a video file of a time lapse of my very first solar tracker in 2014.Controlled by a Arduino uno and the tracker made off Lego blocks. The motors were driven by an h-bridge. Photos Download the related files Build your own solartracker of my designs and build a better one.