In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Zoot wrote:

Another trick that can work, but requires hardware on the "master" -- setup to IR detectors with a "vane" between them so that the 'bot has to be pointed right at the IR source for BOTH to be triggered, and a slight turn either way only allows one to be triggered. Then have the "master" where a small battery operated "badge" that sends out IR pulses. That would let the 'bot track the master, and regular object detection can decide if the 'bot is too close. The problem here is that you need to have your badge, and you need to either put on top of a hat or something (so that it can beam in all directions) or decide if the 'bot can only track your front or back. 

I would have small SX driven badge that sends out IR "bits" in a short sequence, so that the 'bot could differenitate between true IR tracking signal and IR "noise" from other remotes, sunlight, etc.

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