input/iouput

Archiver

do you know how long does a value need to be on an I/O pin for the
stamp to recognize it?

if i'm attaching external circuits is 1mS long enough for it to read that it's
a high signal?

thanks :-)
LaQuida

Archiver

hello,

i am currently using a bsisx for timing and my trigger signal is only high for a
few microseconds. the stamp picks it up just fine.

i think a millisecond is more than adequate.

good luck,

-pete

On Tue, 23 Jan 2001, sunset97 wrote:

> do you know how long does a value need to be on an I/O pin for the
> stamp to recognize it?
>
> if i'm attaching external circuits is 1mS long enough for it to read that it's

> a high signal?
>
> thanks :-)
> LaQuida
>
--
Peter Green
111 IATL peter-w-green@u...
The Department of Mechanical Engineering office: 319.335.3694
The University of Iowa lab: 319.335.3585
Iowa City, Iowa 52242 fax: 319.335.5669

Archiver

Im not sure but I think it depends on how much code you are reading if
your only checking one pin in a loop the bs2 is running about 50nS if
you look on tracy allen's site you will find the timing for most
commands. Making it short Maybe !

Peter William Green wrote:
>
> hello,
>
> i am currently using a bsisx for timing and my trigger signal is only high for
a few microseconds. the stamp picks it up just fine.
>
> i think a millisecond is more than adequate.
>
> good luck,
>
> -pete
>
> On Tue, 23 Jan 2001, sunset97 wrote:
>
> > do you know how long does a value need to be on an I/O pin for the
> > stamp to recognize it?
> >
> > if i'm attaching external circuits is 1mS long enough for it to read that
it's
> > a high signal?
> >
> > thanks :-)
> > LaQuida
> >
> --
> Peter Green
> 111 IATL peter-w-green@u...
> The Department of Mechanical Engineering office: 319.335.3694
> The University of Iowa lab: 319.335.3585
> Iowa City, Iowa 52242 fax: 319.335.5669

Archiver

>do you know how long does a value need to be on an I/O pin for the
>stamp to recognize it?
>
>if i'm attaching external circuits is 1mS long enough for it to read that it's
>a high signal?
>
>thanks :-)
>LaQuida

Hi LaQuida,

It depends on how fast or how often your program can get around to
checking the inputs. Are you using the PULSIN command? Or a program
loop? How often does the signal occur?

If the signal is too brief for the stamp to catch it, then you can
sometimes rig up a capacitor/diode to capture the event and hold it
until the stamp gets around to checking, or a latch to do the same
thing.

-- Tracy Allen
electronically monitored ecosystems
http://www.emesystems.com

Archiver

Stampers,

What is the difference between a bs2 and a bsisx. Does the bsisx execute
instructions at a constant rate? Can you program it w/ pbasic?

Thanks,

David

Archiver

hello david,

sorry i mistyped there. i'm using the bs2sx. you can look at the specs on the
parallax website. basically it is faster bs2. all of the programming and
layout is the same as the bs2. it's a little more expensive and a lot more
power hungry.

take a look at

http://www.parallaxinc.com/

look under downloads and search for sx

look under products and search for sx

i think this is also discussed in sever faqs.

good luck,

-pete

On Tue, 23 Jan 2001, Production Technology, L.L.C. wrote:

> Stampers,
>
> What is the difference between a bs2 and a bsisx. Does the bsisx execute
> instructions at a constant rate? Can you program it w/ pbasic?
>
> Thanks,
>
> David
>
>

--
Peter Green
111 IATL peter-w-green@u...
The Department of Mechanical Engineering office: 319.335.3694
The University of Iowa lab: 319.335.3585
Iowa City, Iowa 52242 fax: 319.335.5669