Thanks Sid (and how many feet? )Two different excel files, ...
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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]
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]
Comments
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 ?
>
Don't forget that you'll need a ground wire between the two Stamps. That's
why I'd go with 18 ga. lamp cord, or maybe speaker w1re from Radio Shack.
Sid
[noparse][[/noparse]Non-text portions of this message have been removed]
+- 12 volt signaling, was only good to 50 feet
(at 9600 baud).
If you do this, you might want to talk at a
lower baud-rate -- say 1200, or 300 baud. The
problem here is not the resistance of the wire,
the problem is the capacitance of driving that
long a line. It could work -- the BS2 has
LOTS of drive current (20 mA) available. The
capacitance tends to remove the higher frequency
parts of the signal -- your nice square wave
232 signal starts looking like a rounded-hill
sine wave.
--- In basicstamps@yahoogroups.com, 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]
high-frequency roll-off due to the cable acting like a big capacitor and
creating a low-pass filter. Note that with low-capacitance shielded wire you
can run digital signals much further. I used to push 9600 baud RS-232 in
excess of 300 feet with the right cable.
Mike Sokol
mike@f...
www.fitsandstarts.com
" One should not increase, beyond what is necessary,
the number of entities required to explain anything"...
-William of Occam-
Original Message
From: <Newzed@a...>
To: <basicstamps@yahoogroups.com>
Sent: Wednesday, June 02, 2004 5:56 PM
Subject: Re: [noparse][[/noparse]basicstamps] Thanks Sid (and how many feet? )Two different
excel files, ...
> 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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>
>
>
My .02,
Dennis
Original Message
From: Allan Lane [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=hzhKN1x5KioQ-2eAv-L5EGbl3217D_jaBhgR6dItPE-Q7kf3oWRXwgc9VqlaWuwYN7SMVxrtZANMbvgzIgRGqzp5]allan.lane@h...[/url
Sent: Wednesday, June 02, 2004 3:09 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Thanks Sid (and how many feet? )Two different
excel files, ...
Wow, 100 feet? I thought RS-232, with its
+- 12 volt signaling, was only good to 50 feet
(at 9600 baud).
If you do this, you might want to talk at a
lower baud-rate -- say 1200, or 300 baud. The
problem here is not the resistance of the wire,
the problem is the capacitance of driving that
long a line. It could work -- the BS2 has
LOTS of drive current (20 mA) available. The
capacitance tends to remove the higher frequency
parts of the signal -- your nice square wave
232 signal starts looking like a rounded-hill
sine wave.