Let's Make Robots!

IR Homing Beacon?

I'm looking to build an Beacon, IR or otherwise, that a robot can see and simply drive to. Pretty much like a docking station for the robot to be recharged or a robot that follows you. (unless that's something different...)

I did a few searches, but I've only come up with robots that use a beacon and not how to build the circuit and write the code.

Any help? 


Edit: 8.31.09


I don't know if this helps, but I'm pretty much looking to build what CtC did here: http://letsmakerobots.com/node/6499

He talks a bit how he does it, but I don't really understand, so I'm just going to have to do more research on how works in general. Like how different frequency signals are encoded, sent, received, and decoded. 

Am I on the right track?

Does this have anything to do with IR serial communication?  

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An IR flashlight? How dare you, belittle me! :P

I've stumbled upon that, but isn't there some frequency it should be oscillating at? What about the receiver? Coding?