Home Work Board-Breadboard (not good for serout communication)Two different exc

Archiver

Thanks,

It seems that the Home Work Board-Breadboard
isn't good for this job because they have
220 ohm resistors.

Joe

--- Newzed@a... wrote:
> In a message dated 6/2/2004 5:42:52 PM Eastern
> Daylight Time,
> joeterk1@y... writes:
>
>
> > Thanks Sid, and do you know how many
> > feet of wire is the maximun for
> > connect one pin of the BasicStamp A, to the other
> > pin of the BasicStamp B ?
> >
> >
>
> That would be for the serout? I would think that
> with 20 ga stranded you
> could run 100 feet. 20 ga. has a resistance of
> about 1.2 ohms per hundred feet.
> This would give you about a 1 volt drop over the
> distance, which should
> leave enough to communicate with Stamp 2. I'd try
> it with 18 ga. lamp cord for a
> start, although that may be a bit of over kill. If
> it was me I'd go with the
> 18 ga.
>
> Sid
>
>
> [noparse][[/noparse]Non-text portions of this message have been
> removed]
>
>
>
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Archiver

No, I would guess the HomeWork board would
be fine. The extra 220 ohm resistors just
give you some protection.

Now, if you were recieving 'true' RS-232,
with +- 12 volt signals, you would need a
22 KOhm resistor in there. However, for
the 0 to 5 volt 232 signaling levels between
two Stamps, the 220 resistor merely limits
any short-circuit current between the two
devices.

It's actually needed, if you want to use the
same pin to 'talk' and also 'listen'. If
both Stamps tried to 'talk' at the same time,
without the resistor there is the risk of
burning out the pin's driver.


--- In basicstamps@yahoogroups.com, joe terk <joeterk1@y...> wrote:
> Thanks,
>
> It seems that the Home Work Board-Breadboard
> isn't good for this job because they have
> 220 ohm resistors.
>
> Joe
>
> --- Newzed@a... wrote:
> > In a message dated 6/2/2004 5:42:52 PM Eastern
> > Daylight Time,
> > joeterk1@y... writes:
> >
> >
> > > Thanks Sid, and do you know how many
> > > feet of wire is the maximun for
> > > connect one pin of the BasicStamp A, to the other
> > > pin of the BasicStamp B ?
> > >
> > >
> >
> > That would be for the serout? I would think that
> > with 20 ga stranded you
> > could run 100 feet. 20 ga. has a resistance of
> > about 1.2 ohms per hundred feet.
> > This would give you about a 1 volt drop over the
> > distance, which should
> > leave enough to communicate with Stamp 2. I'd try
> > it with 18 ga. lamp cord for a
> > start, although that may be a bit of over kill. If
> > it was me I'd go with the
> > 18 ga.
> >
> > Sid
> >
> >
> > [noparse][[/noparse]Non-text portions of this message have been
> > removed]
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed.
> > Text in the Subject and Body of the message will be
> > ignored.
> >
> > Yahoo! Groups Links
> >
> >
> > basicstamps-unsubscribe@yahoogroups.com
> >
> >
> >
>
>
>
>
>
> __________________________________
> Do you Yahoo!?
> Friends. Fun. Try the all-new Yahoo! Messenger.
> http://messenger.yahoo.com/