1/31 I want to control 16 different LED's by sending in
short (~1ms, ~5V) pulses at various times and I need to be
able to specify what the times are when the pulse begins
(not necessarily the same for each LED). I'd like my
computer to control all this, too. Whats the best
way to do this?
\_ If control doesn't need to be in real time, then a simple
way to do it is to write to your parallel port, and build
a simple board with ground from the port and have other
pins drive the various LEDs. Otherwise get a clock chip
and some flipflops and build a logical circuit. Look at
your 150 book.
\_ Thanks. how do I write to my parallel port
then?
\_ i realize that stfw is not a nice thing to say,
but i have done exactly this before, and there
is a document available on the web that has
many pages of detailed useful info on
the parallel port. I ended up using the assembler
command "out" in C. also, don't just drive the LEDs
straight from the parallel port, use a buffer of
some kind.
some kind. oh, yeah. that's the hardware definition
of "buffer", not the software definition. high impedance
input, low imdance output;otherwise you could fry your
parallel card! |
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