On Sun, 27-Oct-2002 at 09:12:33 -0800, David Nicholas Kayal wrote:
> I'm looking for a 5 volt signal.
>
> I have wires plugged into pins 2 and 25 of the parallel port.
>
> I have written a small program:
>
> #include
> #include
> #include
>
> int main()
> {
> int fd;
> while(1)
> {
>
> :The output signals don't go straight from the chip - do they?
> :I've seen few KOhms resistors on most boards for each output pin.
> An external series resistor is there strictly for current
> limiting purposes.
Yep, that's why I asked if manufacturers usually put external
resistors.
I tried to
:The output signals don't go straight from the chip - do they?
:I've seen few KOhms resistors on most boards for each output pin.
:
:27.10.2002; 19:32:00
:[SorAlx] http://cydem.zp.ua/
It depends on the chip. Most modern serial driver chips have series
resistors on the outputs, inside th
On Tue, Oct 29, 2002 at 05:08:45PM +0100, Bernd Walter wrote:
> On Mon, Oct 28, 2002 at 08:56:35AM -0500, Joe Sunday wrote:
> > On Sun, Oct 27, 2002 at 09:12:33AM -0800, David Nicholas Kayal wrote:
> >
> > > I'm looking for a 5 volt signal.
> > >
> > > I have wires plugged into pins 2 and 25 of
On Mon, Oct 28, 2002 at 08:56:35AM -0500, Joe Sunday wrote:
> On Sun, Oct 27, 2002 at 09:12:33AM -0800, David Nicholas Kayal wrote:
>
> > I'm looking for a 5 volt signal.
> >
> > I have wires plugged into pins 2 and 25 of the parallel port.
> >
> > I have written a small program:
> >
> > #inclu
On Sun, Oct 27, 2002 at 09:12:33AM -0800, David Nicholas Kayal wrote:
> I'm looking for a 5 volt signal.
>
> I have wires plugged into pins 2 and 25 of the parallel port.
>
> I have written a small program:
>
> #include
> #include
> #include
>
> int main()
> {
> int fd;
> while(1)
>
> In anycase, I can only concur on the danger of ganging the parallel
> power output bits. A single chip is driving those outputs and is
> almost certainly not rated to deal with a maximal current draw from
> all of them at once for long periods of time. It could fry.
The output s
Matthew Dillon wrote:
> Huh. I would have expected you to use the current loop on the
> phone line to power the dialer. There's a significant amount
> of power available there, though you would have to isolate the
> circuit since the common mode could be upwards of one or two
>
:
:Matthew Dillon wrote:
:> Uh guys. Parallel port digital outputs do not generally have a whole
:> lot of drive. I really doubt a parallel port output could drive a
:> relay.
:
:Depends on the amperage the relay draws. 8-).
:
:I used to use the paralell port output to drive a pulse
On Sun, 27 Oct 2002 11:19:15 -0800 (PST)
Matthew Dillon <[EMAIL PROTECTED]> wrote:
>
> :
> :Shouldn't the fact that the signal is in a while loop keep the 5 volt
> :signal going? Isn't the parallel port being blasted with the
> :value 255 over and over again?
> :
> :The serial port will not fulf
On Sun, Oct 27, 2002 at 11:19:15AM -0800, Matthew Dillon wrote:
>
> :
> :Shouldn't the fact that the signal is in a while loop keep the 5 volt
> :signal going? Isn't the parallel port being blasted with the
> :value 255 over and over again?
> :
> :The serial port will not fulfill what i am ultima
Matthew Dillon wrote:
> Uh guys. Parallel port digital outputs do not generally have a whole
> lot of drive. I really doubt a parallel port output could drive a
> relay.
Depends on the amperage the relay draws. 8-).
I used to use the paralell port output to drive a pulse dialer and
:
:Shouldn't the fact that the signal is in a while loop keep the 5 volt
:signal going? Isn't the parallel port being blasted with the
:value 255 over and over again?
:
:The serial port will not fulfill what i am ultimately trying to achive. I
:am trying to have the parallel port to control 8 rel
I'm having problems just using 1 bit fromt he parallel port at this time.
On Sun, 27 Oct 2002 [EMAIL PROTECTED] wrote:
> the parallel port then is ok
> now you can use a logical multiplexer
>
> and from the paralel port you can use just 3 bits
>
> take a look to the data sheets ot this multiplex
Shouldn't the fact that the signal is in a while loop keep the 5 volt
signal going? Isn't the parallel port being blasted with the
value 255 over and over again?
The serial port will not fulfill what i am ultimately trying to achive. I
am trying to have the parallel port to control 8 relays each
I'm looking for a 5 volt signal.
I have wires plugged into pins 2 and 25 of the parallel port.
I have written a small program:
#include
#include
#include
int main()
{
int fd;
while(1)
{
ioctl(fd, PPISDATA, 255);
}
}
and have it executing...
I have a multi-meter with the p
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