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Author Topic: Infrared Emitter Detector Amplified Signal Circuit($50 robot)  (Read 2027 times)

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Offline mobzTopic starter

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Infrared Emitter Detector Amplified Signal Circuit($50 robot)
« on: November 04, 2007, 08:10:31 PM »
If someone could tell me

1) why we need to amplify the output of the detector circuit?
2)Why do we give the phototransistor Voltage?(Vcc)

3)how do i modulate the the signal to avoid interference from ambient light?


Any input will be highly appreciated..

Offline frank26080115

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Re: Infrared Emitter Detector Amplified Signal Circuit($50 robot)
« Reply #1 on: November 04, 2007, 10:27:27 PM »
amplification is not really needed

also, to avoid the problem of ambient light, what i do is take a first reading, use a mosfet to turn on the emitter, take 2nd reading, turn off emitter, then compare the two readings for percentage difference

 


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