[PARPORT] Generate an interrupt...

David Turner (dmht97@doc.ic.ac.uk)
Wed, 17 Nov 1999 15:49:33 +0000

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Hi,

I'm currently trying to get a simple push-to-make microswitch to
generate and interrupt on the parallel port and came up with an
equally simple circuit to do this.

However, I'm no longer sure that I'm doing enough to generate the
signal, does anyone have any advice?

I'm using a signal from the port to power the ciruit, is the
resistance high enough? (theoretically it will draw 25e-6 A)

Am I correct in believing that the input on the port is signal low?

Do I need to set any other pins before signalling pin 10? (I think
that this is my main mistake)

  Pin 2 >------o----
                 |
                 -
                | |
                | | 200k
                | |
                 -
                 |
                 o----------> pin 10
                 |
                 |
                 o |
                   | (push-to-make)
                 o |
                 |
             ----o----------> pins 18-25
  

Thanks for any help,

Dave

-- 
Dave Turner <dmht97@doc.ic.ac.uk>
Tel  : 07931 501 518
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