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IR Tag Emitter
The robots communicate to each other with IR (Infrared) signals. Each robot has a beacon emitter, a tag emitter and four receivers. The transmitter in the front is the tag emitter. Its range is about an inch away from the front of the robot. The Ants use this transmitter to signal when they have bumped into each other.
For example, when they are playing tag, the robot that is "it" transmits the tag-signal from its tag emitter every time it bumps into something. If that something is another robot, then that robot will receive the transmission and know that it's been tagged.
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