Considering:
Once its mode is set, a single 5V output is sent via its output pins. The RC has 5V inputs.
It accepts power in voltages in a range that includes the voltage that the robot runs at.
It would be difficult for teams to wire up a IR emitter that emits certain codes, but it would be easy(-er) for them to mount this on the robot and receive codes from more complicated hardware mounted on the field.
Dave's joke in Atlanta in 2006 before the Einstein matches.
Changing my earlier guess:
I now guess that this will be robot mounted, and will receive info about field status from a high-mounted (hence the angle upwards on the IR sensor) source, akin to the green light in 2006 and 2007. Since it has 4 modes, then we can assume the field will have some item (probably in autonomous mode) that can be in a state that is in exactly one of up to four states. Each competition will probably have a 'training unit' where you can take your robot to get its IR sensor trained to recognize the 4 IR codes for the field modes, similar to how you could get calibration RGB data for the camera.
Quote:
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the field lights are not florescent
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But the arena lighting will often be florescent, regardless of the field lights.