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Photoelectric switches with TTL output?

Discussion in 'Electronic Design' started by znelson, Nov 22, 2003.

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  1. znelson

    znelson Guest

    I'm in need of photoelectric switches (electric eyes) with TTL +5v/0v
    output. Does anyone know a source for these? I don't need anything
    with critical tolerances, just something that works like a simple
    garage door safety beam.

    I've only been able to find Allen-Bradley switches that operate on
    +10-40v. So my other question is, let's assume I use them with a 12v
    power supply, how can I (easily) turn that into a TTL level signal
    (off/on)? I'm a software developer so I'm not very hardware-saavy. The
    less wiring and soldering I have to do the better!



  2. Got a link to a data sheet? Often these things are just open-collector
    NPN output and you could just connect it to a TTL input with a pull-up
    resistor (something like 1K) to +5V.

    Of course if it's not, it could destroy what it's connected to, and
    maybe the sensor as well...

    Best regards,
    Spehro Pefhany
  3. znelson

    znelson Guest


    Thanks for the follow-up. This is the only data sheet I've been able
    to find from Allen-Bradley:

    I have a sample photoswitch from them, model 9040, but I can't find a
    specific datasheet on that model, I think they lump all series 9000

    At any rate, this has 4 leads, the supply voltage is 10-40vdc, and
    then there's 2 other leads, NPN and PNP outputs at 40vdc max. I don't
    know what the difference is between the NPN and PNP output.

    I *have* found something I think will work with almost no

    There are 3 leads, the output lead is TTL level 0/5v, so I think this
    would work right out of the box for me.

    Any thoughts?
  4. Fred Bloggs

    Fred Bloggs Guest

    Yeah- if you can't see the difference between a motion detector and a
    photo switch then you should stay away from the garage door. Why don't
    you make one of those plastic block flower bed borders this weekend
  5. znelson

    znelson Guest

    Ok dickface... and while I'm at it I'll pull my cock outta your mom's ass.
  6. GPG

    GPG Guest

  7. GPG

    GPG Guest

    What do you want to do. Suggested opto sensor is (a)expensive (b) a
    process sensor. Some people are not helpful, but you should not lose
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