I recently had to build an infrared close proximity sensor that could tell if something was dropped in a parcel delivery drop box. After some searching, I ended up using a microcontroller and a piece ...

sharp GP2D120X 1 Articles 3D Scanner Using A Sharp Infrared Sensor December 21, 2013 by Phillip Ryals 13 Comments ...

An Arduino Mega Pro Mini handles the logic, sending PWM signals to a DIY servo. The chassis consists of a modified Crazy Cart, selected for its absurdly tight turning radius.