In the Fall of 2015, 4 of my classmates and I were tasked with making an Arduino robot that could find a light source in a room and then go to its location and actuate an indicator. The robot had 5 photoresistors covering a window of 180 degrees. As an additional challenge, the team designed and 3D printed a bumper. Behind the bumper, was a button and when pushed, the robot would activate its collision code. This code made the robot reverse, do a  360° sweep and advance towards the direction of highest lux value.