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Thread: Controlling more than 8 relays on LPT?

  1. #1
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    Controlling more than 8 relays on LPT?

    I've searched through the forum, and maybe I'm not using the right search string, but I couldn't find info on how to control more than 8 relays using the LPT port...

    I'm gonna need in the 20-30 relay range.. what's the best way for me to do this?

    Any help/info/links/etc would be greatly appreciated..

    TIA

    P
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  2. #2
    FLAC cproaudio's Avatar
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    I don't know much about the LPT relay control modules but if you have the funds and programing ability, you can get one of these. http://www.controlanything.com/cgi-b...duct_Code=R325 It's serial.
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  3. #3
    Variable Bitrate
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    use an 8 bit demultiplexor and you can get control of 256 relays. use a 4x4 simple switching matrix and you can get control of 16 relays.

  4. #4
    Variable Bitrate
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    az1324... You have AIM?
    ICQ? Email? Please let me know...

    Thanks!

  5. #5
    Constant Bitrate
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    I used an 8255A PPI chip years ago to control a bunch of devices using the parallel port. It lets you control up to 24 devices with various modes of input/output.

    A quick google search shows some details on this chip:
    http://www.boondog.com/%5Ctutorials%5C8255%5C8255.htm

    http://juniar79.hypermart.net/contro...5A_PPI_faq.htm

    The chip is very easy to use and only about $6.

    http://www.jameco.com/cgi-bin/ncomme...nbr=501&ctgys=

    more docs:
    http://www.jameco.com/jameco/Products/ProdDS/52732.pdf

    -Chris

  6. #6
    Constant Bitrate
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    Forgot to mention that the 8255 requires very little support circuitry and is designed to be controlled by a parallel interface.

  7. #7
    Variable Bitrate
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    digitallexus... you have AIM?

  8. #8
    Constant Bitrate
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    No, sorry.

  9. #9
    Newbie
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    thanks guys.. been a great help
    1988 Caprice Classic Wagon
    NOT your daddy's woody.. <-- [i]SOLD!! Not quite pimpin' enough..


    Progress : [$$$$$----] 50%
    1.2GhZ AMD Duron
    512 Megs Ram
    Cheapy mobo for testing
    Drives: 10gig - TEMPORARY, for testing
    SB Live! 5.1
    GeForce2 64mb
    15" Kristel Industrial Grade Touch Screen

    Software : [##--------] v0.20
    Screen shots/feature list coming soon(..-er or later)

  10. #10
    Retired Admin Aaron Cake's Avatar
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