Hi,
You cannot do this with the parallel port alone. You need an analog to
digital converter of some kind. If you go to my homepage and click on the
PC Data Acquisition link, you will see information on how to use parallel
port A/D's along with ones that connect in other fashions to the PC.
Dick
--
Richard Grier (Microsoft Visual Basic MVP)
See
www.hardandsoftware.net for contact information.
Author of Visual Basic Programmer's Guide to Serial Communications, 4th
Edition ISBN 1-890422-28-2 (391 pages) published July 2004. See
www.mabry.com/vbpgser4 to order.