CheapBot Smart Beacon
The CheapBot Smart Beacon marks the location of objects in a robot's world. A PICAXE-08M creates the 38 kHz pulses that can be detected 360 degrees and over four feet away. Simple changes to the Smart Beacon's code allows robots to identify team members and goal posts.
The CheapBot Smart Beacon kit (beacon) comes with all the parts needed to make a beacon. The price for the kit is $27.50.
Instructions for making a Smart Beacon
Sample code for testing the Smart Beacon
Video of an example CheapBot robot body