Subject: Re: keyboard input path questions
To: der Mouse <mouse@Rodents.Montreal.QC.CA>
From: Vincent <firstname.lastname@example.org>
Date: 07/18/2004 22:15:14
> Well, I'd hardly count that as a matrix keyboard, since one axis of
> the "matrix" is of size 1.
You're right, I didn't notice the "matrix" keyword ;)
For a matrix keyboard, I never seen anything but a scanning mechanism.
However, it is still possible to imagine, e.g. a system where each key
would connect to a different voltage, and so it would stille be possible
to tell which raw/column was activated.
Ex for a 3x3 :
1V 2V 5V
1 V ----X---X---X---\
2 V ----X---X---X----+
5 V ----X---X---X---/
| | |
\ | /
\ | /
In this system, each key must be a double-switch (raw/column) and you
can't detect more than one simultaneous keypress...