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OPTOTHEORY
The opto receiver (Photo Transistor) should be approximately 0.1-0.7 volts when the opto beam
is unblocked and approximately 11-13 volts when the opto beam is blocked. The opto transmitter
(L.E.D.) should always be approximately 1.4 volts. Note, the transmitter (L.E.D.) is larger than
the receiver (Photo Transistor); it protrudes further from its case.
LED Board
Transmitter
1.0-1.1 Volts
Gray
Photo Transistor
Board
Receiver
0.1-0.7V Unblocked
11- 13V Blocked
WHT
m
BLK
I
Infrared Ray
Black
1-39
White
Green