sensor
Q1 < how can i know the circuit are using a sensors? >
A1 the circuit schematic might help.
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Q2< what kind of circuit using op-amp and has 2 sensor? >
A2 a single op amp could distinguish btwn 2 sensors.
( see < ATTACHMENT > )
The example circuit gives:
1. IR_1]Lit ; IR_2]Dark then Ein > +1.0
2. IR_1]Dark ; IR_2]Lit Ein < -1.0
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3. IR_1]Dark ; IR2]Dark Ein =0
4. matched components, IR_1, IR_2 receive equal light
IR_1]Lit ; IR_2]Lit Ein =0
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