LEGO EV3 Color Search

This tutorial shows you how to build a mobile app that instructs an EV3 LEGO robot to search for a certain color on a white surface bordered by black. The user can pick one color out of red, green, blue, or yellow for the robot to search. The robot will search across the white surface and turn around if it gets to the black border. Here is a demonstration video.
Go to the tutorial.