[simpits-tech] Driving LED's form the parallel port (?)

[Stig Jørgensen]

Unfortunately its not that simple.....

The pulse train is very precise and fast. for deflecting left the with of the pulse is 1 ms, for full deflection to the right the with is 2ms, these pulses must come within 20ms - and the minimum standard delay in a computer is aprox 18ms so you don't have a timer with a high enough resolution...

/Stig


-----Original Message-----
From: simpits-tech-bounces at simpits.org [mailto:simpits-tech-bounces at simpits.org] On Behalf Of Bubba
Sent: 2. november 2004 20:39
To: Simulator Cockpit tech list
Subject: Re: [simpits-tech] Driving LED's form the parallel port (?)

Matt Bailey wrote:
>
> Hmmmm, driving them just with the parallel port might fry the port, or
> would it just not be enough juice? I guess if I use an external source
> of power I'm gonna have to learn some basic electronics to make it
> work,
> drat. :P
> But yeah, 8 LED's.......that's enough to get me started for sure. Say,
> can you vary the output from the pins individually? Like maybe for
> driving a servo or two.........

Servos don't use a variable voltage, they use a pulse train, so yes, you can 
drive 8 servos off a parallel port with some creative programming. Actually, 
with some very creative programming and a few components you could probably 
drive 16 of them from one parallel port by multiplexing it.
-- 
Steve
mysticz28 at swbell.net
He who seeks will find, and he who knocks will be let in.


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