How to configure pins of photocopier optocoupler switch

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21 Jul 2019 05:00 - 21 Jul 2019 05:07 #140046 by DinukaShehan
There 3 pins
Vcc
Gnd
Out

How can find them correctly.
I tried with multimeter diode mode can not get a idea.

any ideas?
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Last edit: 21 Jul 2019 05:07 by DinukaShehan.

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21 Jul 2019 08:46 #140058 by HueyHQ
My best guess (without having any to test on) is that the outer two wires are VCC and GND, and the middle wire is the output.

Put the multimeter (in diode mode) across the outer two wires, and you should get a "beep" and a reading of approx. 0.7V - if not, swap the multimeter probes. Whichever wire the black/negative probe is touching when it beeps (or reads a low voltage) is the GND wire.

Try that first - come back if any further issues.
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21 Jul 2019 14:46 #140081 by DinukaShehan

HueyHQ wrote: .

Put the multimeter (in diode mode) across the outer two wires, and you should get a "beep" and a reading of approx. 0.7V - if not, swap the multimeter probes. Whichever wire the black/negative probe is touching when it beeps (or reads a low voltage) is the GND wire.

.


I don't get a reading with your method?

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21 Jul 2019 17:27 #140087 by PCW
The other option is to put a series resistor in the 5V power lead (say 330 Ohms)
so a reversed connection will do no harm, and then try the outer leads both ways
( checking if the middle pin responds to blocking the light path )
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21 Jul 2019 17:50 #140094 by DinukaShehan

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21 Jul 2019 17:51 #140095 by PCW
Almost always...
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21 Jul 2019 18:36 #140098 by DinukaShehan

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22 Jul 2019 00:09 #140128 by tommylight
I watched it ! :)
That is the correct and more complicated way, but it is the safest way.
Also you can use your mobile phone camera to see the IR when on. Use a TV remote controll to check if the camera can see IR.

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