There are three sensors; a pair of Sharp GP2D12 IR (infrared) distance sensors
and a custom IR circuit. The GP2D12's will detect objects in the range of
10 cm to 80 cm. Unfortunately, objects in the range 0 thru 10 cm return
the same values as objects in the 10 to 80 cm range. The close up IR
sensor can detect objects in the 0 to 20 cm range.
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