the ir was used in 2004. text from 2004 game manual found
here :
Quote:
3.2.5 IR Beacons
Centered on the top of each Tee Frame is a light beacon that continuously emits an infrared signal across the
playing field during a match. Each beacon emits at the same IR frequency, but sends pulse trains of different
pulse widths. The beacon nearest to the red moveable goal will transmit a Type-1 signal, and the one nearest
the blue goal will be Type-0. These signals are detectable by robot-mounted IR receivers that are tuned to the
beacons’ frequency. The receivers provide direct input to the robot’s control system when they sense an IR
signal.
FIRST has supplied appropriate code that allows teams to program their robot’s controller to make decisions
based on a received signal and discriminate between the two Tee locations. Thus teams may create
mechanisms on their robots to locate and track a beacon during the autonomous period. The Kit contains four
IR receivers and materials needed to build a beacon.
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So it could be used for autonomous instead of the grenn light and camera this year.