Photo interrupter as a swicth

noname06 said:

Hi, I am using a SFH 9305 photo interrupter for my project. Can anyone tell me the differences between putting a resistor before the anode and putting a resistor at the cathode end. Where should i put my output? At the emitter or collector leg? I have tried many times but when i block it nothing happens. How can I check if my photo interrupter is working. Thanks

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noname06 said:

I've tried that but it still cant work..i guess the current at the emitter collector is too low as i measured out 23microA...in my project I've used the same source for the emitter and sensor part..How do i calculate out the current at the emitter collector side?

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