Parallel Port Interface

Discussion in 'The Projects Forum' started by lkwah86, Mar 17, 2010.

  1. lkwah86

    Thread Starter Member

    Mar 9, 2007
    I have a project that control the electronic appliances by speech recognition through parallel port. I'm using Windows 7 as OS for my laptop. The driver shows in Device Manager is "USB Printing Support".

    Now I have a problem which is the interface between USB to parallel port converter and laptop. When I plug in the converter, I check the voltage of each pins, Pin1-13 show 4.7V while Pin14-25 show 0V. How can I control the output? I used VB code to send output but it doesn't work.

    Anyone can advise me?