IR Sensor

The photo depicts the schematics for an infrared sensor which allows you to detect an object's distance from the robot. The big picture problem is attach this infrared sensor on both wings of the aerial robot. Attaching these sensors on the wing tips will help the robot navigate through the halls of any building.. This tutorial shows you how to construct and test one infrared sensor and takes approximately 3 hours to complete.

Full story here
http://www.pages.drexel.edu/~pyc23/ir_sensor.html