Searching \ for '[EE:] How to get Eagle to connect two nets at only' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/pcbs.htm?key=eagle
Search entire site for: 'How to get Eagle to connect two nets at only'.

Exact match. Not showing close matches.
PICList Thread
'[EE:] How to get Eagle to connect two nets at only'
2004\03\10@010706 by Mark Perri

picon face
I have a circuit that I drew up in Eagle that has both analog and digital
grounds, and I'd like to have them connected at one point if possible.
But when I click in the schematic with the net tool to connect them, it
just wants to convert them all to the same net name.  It then connects
them however it wants in the board layout when I autoroute.
I tried connecting them with the wire tool but it didn't change anything
on the board, and I tried setting "auto end net and bus" off, but that
didn't help.

I guess I could draw a wire between the two ground points in the board
manually, but that seems like it would make the schematic and board
inconsistent, etc. etc.

Anyone have any tips?
Thanks,
Mark

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email spam_OUTlistservTakeThisOuTspammitvma.mit.edu with SET PICList DIGEST in the body

2004\03\10@031453 by William Chops Westfield

face picon face
On Tuesday, Mar 9, 2004, at 22:05 US/Pacific, Mark Perri wrote:

> I have a circuit that I drew up in Eagle that has both analog and
> digital grounds, and I'd like to have them connected at one point if
> possible. But when I click in the schematic with the net tool to
> connect them, it just wants to convert them all to the same net name.

This is a FAQ over on the Eagle newsgroups.  As of 4.08, the only way
to do it was with some sort of kludged component (like a zero ohm
resistor.)  I haven't been working or reading enough about 4.1x to know
if it's one of the things that has changed...

BillW

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email .....listservKILLspamspam@spam@mitvma.mit.edu with SET PICList DIGEST in the body

2004\03\10@100536 by Herbert Graf

flavicon
face
> I have a circuit that I drew up in Eagle that has both analog and digital
> grounds, and I'd like to have them connected at one point if possible.
> But when I click in the schematic with the net tool to connect them, it
> just wants to convert them all to the same net name.  It then connects
> them however it wants in the board layout when I autoroute.
> I tried connecting them with the wire tool but it didn't change anything
> on the board, and I tried setting "auto end net and bus" off, but that
> didn't help.
>
> I guess I could draw a wire between the two ground points in the board
> manually, but that seems like it would make the schematic and board
> inconsistent, etc. etc.
>
> Anyone have any tips?
> Thanks,
> Mark

       Don't know about anything specific to Eagle, however a zero ohm resistor
would do what you want? TTYL

----------------------------------
Herbert's PIC Stuff:
http://repatch.dyndns.org:8383/pic_stuff/

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listservspamKILLspammitvma.mit.edu with SET PICList DIGEST in the body

2004\03\10@153015 by llile

flavicon
face
You need a part called a "netmixer"  it is essentially a surface mount
device with two adjacent surface mount pads and some copper between them.
It cannot be one point, but it can be very small using the tiniest SMT
pads.  I think there is one of the Eagle download page but if not you can
make one in a minute.

Whenever you use this part you will get an ERC error message that there is
copper connecting two different nets (duh, that is what we want!) so
ignore this message.

I use this all the time to connect a heavy 120VAC trace with a fat trace
width and high current to a thin 120V trace going to some low current
device.  Also use it to help make printed fuses (thin sections of high
current traces) that will blow if the high current device shorts out. Only
do this if the product you are making costs under $10, it is a really
shoddy cheap trick.

-- Lawrence Lile
Senior Project Engineer
Toastmaster, Inc.
Division of Salton, Inc.
573-446-5661 voice
573-446-5676 fax




Mark Perri <.....mperriKILLspamspam.....UCLINK4.BERKELEY.EDU>
Sent by: pic microcontroller discussion list <EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU>
03/10/2004 12:05 AM
Please respond to pic microcontroller discussion list


       To:     PICLISTspamspam_OUTMITVMA.MIT.EDU
       cc:
       Subject:        [EE:] How to get Eagle to connect two nets at only one point?


I have a circuit that I drew up in Eagle that has both analog and digital
grounds, and I'd like to have them connected at one point if possible.
But when I click in the schematic with the net tool to connect them, it
just wants to convert them all to the same net name.  It then connects
them however it wants in the board layout when I autoroute.
I tried connecting them with the wire tool but it didn't change anything
on the board, and I tried setting "auto end net and bus" off, but that
didn't help.

I guess I could draw a wire between the two ground points in the board
manually, but that seems like it would make the schematic and board
inconsistent, etc. etc.

Anyone have any tips?
Thanks,
Mark

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email @spam@listservKILLspamspammitvma.mit.edu with SET PICList DIGEST in the body



--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email KILLspamlistservKILLspamspammitvma.mit.edu with SET PICList DIGEST in the body

2004\03\12@033911 by Jesse Lackey

flavicon
face
This is what I use - an 0402 SMT "resistor" that is a wire.  You get
numerous DRC violations.  Its really stupid that Eagle doesn't have a
way to do this properly.  I need them all the time.  (analog gnd vs.
digital gnd vs. DC/DC gnd vs. clock gen gnd etc.)

You could also use a regular 0402 or whatever resistor between the
grounds, then right when the board is complete draw a wire in the board
to connect the two sides.  This way you don't have to wade thru the DRC
errors each time you check your work while doing the board layout.

The downside to this is that the solder mask leaves a space for the 0402
pads, of course.  This may be a problem in production.

Grrrr, Eagle 4.11 is excellent in so many ways, there are just a handful
of easily-added features that really mar it for serious use.  This is in
my top-5 enhancement wishlist.

J

RemoveMEllileTakeThisOuTspamSALTONUSA.COM wrote:
{Quote hidden}

--
"There are 10 kinds of people in the world; those who understand binary
and those who don't."

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

2004\03\12@132054 by Ken Pergola

flavicon
face
Jesse Lackey wrote:

> Grrrr, Eagle 4.11 is excellent in so many ways, there are just a handful
> of easily-added features that really mar it for serious use.  This is in
> my top-5 enhancement wishlist.

Hi Jesse,

Have you e-mailed Eagle regarding this?
If you have not done so, I would suggest contacting them via phone or e-mail
and make your wishlist known to them.
Most good companies are willing to listen to user-feedback, and implement
solutions for them.
Always make your wishlist known to the company of the product you use -- it
could become a reality.

I like to use the restaurant rule analogy:
If your food is bad, you *must* tell the manager, otherwise you do them (and
you) a disservice and they will never have a chance to fix the problem.

Best regards and good luck Jesse,

Ken Pergola

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

2004\03\12@145417 by David P Harris

picon face
Hi-
Eagle does have several egroups: eagle.support.eng for one.
This issue has been discussed on that group before, but additional
voices asking will probably help make it come true.
Unfortunately, I do not see how you implement it.  I think it would be a
special feature and would require mods at a number of places to prevent
complaints from the program itself.

I also have wanted this feature.   I had three power districts and ended
up connecting them with EMI Bead Core Jumpers
(www.maco.panasonic.co.jp/www-data/pdf/AEH0000/AEH0000CE7.pdf
available from Digikey) to limit high frequency  transfer.
David



Ken Pergola wrote:

{Quote hidden}

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

2004\03\12@173619 by William Chops Westfield

face picon face
On Friday, Mar 12, 2004, at 11:51 US/Pacific, David P Harris wrote:

> I do not see how you implement it.  I think it would be a
> special feature and would require mods at a number of places
>  to prevent complaints from the program itself.

Yeah, the "one signal, one net" philosophy goes pretty deep in Eagle.
Pobably the easiest way to do something would be to implement ERC/DRC
overrides in parts libraries.  The "special connector part" isn't
really so bad to do, but the resulting warnings are troublesome...

BillW

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

2004\03\14@012127 by Jesse Lackey

flavicon
face
Yes, I agree it would probably require a bunch of code hacks to
implement.  Meaning it would probably also generate a bunch of weird
bugs as well.  No fun for the developers.

One thought I just had, instead of a fake SMD, a "thru hole" but really
tiny, still 0402 but with "pads" that are via-sized, and a wire across.
 This way, as is on the board they are conductors.  But break that wire
with an exacto knife, and you've got a convenient place to put a jumper
and ammeter. (why is it called an ammeter if it is really an amp-meter?)
 These would be useful sprinkled to Vcc on various chips in a design,
and if things are taking too much power (as my current design is...) you
can cut and measure stuff.  If things are going swimmingly you just
leave it all as - is.

Oy.  So many more DRC errors doing this tho.

best,
J



William Chops Westfield wrote:
{Quote hidden}

--
"There are 10 kinds of people in the world; those who understand binary
and those who don't."

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.

More... (looser matching)
- Last day of these posts
- In 2004 , 2005 only
- Today
- New search...