Re: real time parallel port input
- From: "Thomas Malia" <tommalia@xxxxxxxxxxxxxxxx>
- Date: Mon, 12 Mar 2007 09:52:13 -0500
It's been more than 10 years since I messed with this stuff, but as I
recall, you're right on the money about the bounce issue.
As I recall I was able to build a simple bounceless switch with some basic
AND and OR gates. I think I got the circuit diagrams from a book call the
"TTL Cook book" or something like that.
<pete_tomson@xxxxxxxxxxx> wrote in message
news:1173632156.691474.6660@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi All - I'm trying to write a program that reads data fed directly
into the parallel port from a reed switch on my bike (a pc based bike
computer basically). There is no external circuitry - the opening and
closing of the switch toggles pin6 on my parallel port.
Basically I'm wondering if anyone has tried something similar and
whether they can give me some advice on accurately reading the data. I
think I get alot of bounce from the switch giving me multiple toggles
for one open-close of the switch and I don't know if I'm missing some
inputs through timer delays etc. I'm a novice to VB in the sense that
everything I know is self taught. Can anyone suggest a robust method
of collecting accurate data without going back and adding extra
circuitry?
Thanks
Cal
.
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