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Simple Parallel (Printer) Port Interface (from Aarons site)

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  • Simple Parallel (Printer) Port Interface (from Aarons site)

    With the basic circuit on Aarons site, can I use something like this to use it to switch devices on/off??
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  • #2
    AHH!! I can't work it out... could someone modify the circuit or combine to 2 for me?? I thought that the interface only had 8 outputs.....???? aaron, your site isn't very informative..
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    • #3
      Re: Simple Parallel (Printer) Port Interface (from Aarons site)

      Originally posted by THEMP3KID
      With the basic circuit on Aarons site, can I use something like this to use it to switch devices on/off??
      Yes.

      Originally posted by THEMP3KID
      AHH!! I can't work it out... could someone modify the circuit or combine to 2 for me?? I thought that the interface only had 8 outputs.....???? aaron, your site isn't very informative..
      Aaron's site looks fine to me. Tie the grounds together, then connect the sw1 and sw2 inputs to one of the outputs of the buffer ICs. The (close to) 5v that comes out of the buffer chips will be more than adequate to switch the open collector driver transistors on the relay board.


      Rob
      Old Systems retired due to new car
      New system at design/prototype stage on BeagleBoard.

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      • #4
        Re: Re: Simple Parallel (Printer) Port Interface (from Aarons site)

        Originally posted by Rob Withey
        Yes.



        Aaron's site looks fine to me. Tie the grounds together, then connect the sw1 and sw2 inputs to one of the outputs of the buffer ICs. The (close to) 5v that comes out of the buffer chips will be more than adequate to switch the open collector driver transistors on the relay board.


        Rob
        But which are the outputs?? I thought there was only 8... so, does that mean that some of the output pins go to ground or WHAT??
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        • #5
          12 outputs and 5 inputs. The outputs are the ones next to the arrows going to the right on the left of the buffers. The arrows going to the left are inputs. Bleedin' obvious if you ask me.


          Rob
          Old Systems retired due to new car
          New system at design/prototype stage on BeagleBoard.

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          • #6
            Nah, but on the other side of the ICs.... aarons software only handles 8 outputs, so, which ones do I use for the 8??
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            • #7
              Try it and see?????


              Rob
              Old Systems retired due to new car
              New system at design/prototype stage on BeagleBoard.

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              • #8
                OKAY!!! I GOT IT!!!!

                lol

                (don't mind me)

                parallel port has EIGHT TTL OUTPUTS, FIVE INPUTS and FOUR bi-directional!!!! right???
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                • #9
                  Originally posted by THEMP3KID
                  AHH!! I can't work it out... could someone modify the circuit or combine to 2 for me?? I thought that the interface only had 8 outputs.....???? aaron, your site isn't very informative..
                  My site is quite informative. It's just that you don't know what you're doing.
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