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You seem to be referring to the optical sensor.
The pinout can be found in many different places: on the side of the sensor itself, in any of the technical documentation for the sensor, and in many different threads on these boards.
I'm too impatient to paste a link to any of the numerous other threads which explain this in great detail, so I'll just let you search for it.
Search before you ask questions.
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I played hacky sack with Andy Baker.
2001-2004: Team 258, The Sea Dawgs
2005: Team 1693, The Robo Lobos
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