Sensor without datasheet, what can I do??

Discussion in 'General Electronics Chat' started by JK-FlipFlop, Jul 27, 2010.

  1. JK-FlipFlop

    Thread Starter Member

    Jul 5, 2010
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    Last edited: Jul 27, 2010
  2. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Could be optical barrier sensor, led+phototransistor. But also it could be anything else, where did it come from?
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
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    If that is a slot, then it is probably a photointerrupter used to sense paper.
     
  4. JK-FlipFlop

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    Jul 5, 2010
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    It comes from a printer and I just need help to find out how to use it.
    I know what it does....
     
  5. mcgyvr

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    Oct 15, 2009
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    If you know what it does you should have included that bit-o-knowledge in your post so you didn't get replies guessing a black sensors function.
     
  6. JK-FlipFlop

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    Jul 5, 2010
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    This sensor contain the led and the diod sensor. when you block the light from the led the diod should stop giving '1'. probebly.
     
  7. KMoffett

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    Dec 19, 2007
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    Because there "6" pins in the bottom view, my guess is that it's a quadrature detector. One LED, and two phototransistors or photodiodes. It would have been associated with a slotted/barred wheel, or a barred strip.

    Ken
     
  8. JK-FlipFlop

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    Jul 5, 2010
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    so can you tell me which one of the wires does what???? or how to check it???
     
  9. Papabravo

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    Feb 24, 2006
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    Probably not. Why would you have any expectation that we could do that unless one of us happened to be the original designer of the printer??
     
  10. JK-FlipFlop

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    Jul 5, 2010
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    I have expectations from you to give me any idea of how I can check it or try it.
    I have tools to check it but I don't know how...
     
  11. KMoffett

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    Dec 19, 2007
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    Here is how I see the circuit on the PCB. I'm assuming the one part of A1(a), because of it's relative position, is an LED. I'm making an assumption on the polarity. This can be verified with the diode range on a DVM. The other parts of A1 (b & c) are likely photo transistors. Measure the resistance of R1. You would need to power the LED/R1 circuit 3&1 and add load resistors between 2&3 and 1&4. Block and unblock the optical path and see what happens at to the voltage 2&4.
    This is just speculation.
    Ken
     
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  12. sage.radachowsky

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    May 11, 2010
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    Interesting.

    In the top view with the connector, let's call the top of the four conductors on the ribbon cable "1" and number down from there.

    I'm guessing pin 1 is ground because it leads to a large pour of copper.

    I'm guessing pin 3 is the Vdd for and LED, because it goes to one side of a 2-lead device and the other side has a resistor, I assume it's a current limiting resistor.

    From that, I would put some voltages across pins 1 and 3, starting low like 2V and going higher until you see current flow. If it doesn't work, reverse the polarity. It may be backward from how I think. I'd sense the current going through, with another resistor in series. That way, you may see that it's drawing current, and you may tell from the current profile it's an LED. If it's infrared, you won't see it unless you have an infrared camera. but anyway...

    I'm guessing pins 2 and 4 are sensor outputs that may vary somehow in voltage, based on whether there's something in the slot. You'll have to track those with a multimeter or scope and see how they change when you play with it.

    edit: Yeah, just like KMoffett answered, with a schematic to boot, while I was writing mine.

    Hope that helps.
     
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  13. JK-FlipFlop

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    Jul 5, 2010
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    ok thank you very much for your answers!!!

    I will check it.
     
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