know your limits

[WAnliker-at-aol.com]

<< 
 Also, in re reading your original post, I see you have the switches in
 series?
 Change to parallel as all switches must be closed in order for series to
 work.
 In the ascii art below || represents a switch
 
 
 
                    |----------||----------|
 Pin 12 ---------|----------||----------|-------to parallel port ground
                    |----------||----------|
  >>
My electronics training indicates that you will get an open circuit only when 
all three switches are open, you will not be able to detect the opening of 
any single switch if they are in parallel.
bill