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'[EE]: Eagle and routing.'
2002\09\30@144355 by Jan-Erik Soderholm

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Hi.
Some (maybe simple) questions about Eagle...

For my simple home projects, I'd like to use single sided
PCB's, 'cos they are much easier to make at home.

Now, sometimes there is a need to inset a few extra wires
(jumpers) to make the routing complete.

Q1: Is it possible to make Eagle insert some extra wire's
while autorouting ?

Q2: If the answer to Q1 is no, what is the easiest way to
add some wires by hand ? I always end up with a few leftover
"unrouted" signals.

Maybe I have to go back to the schema view and add the wires
(and extra holes/pads) there ?

I'm (so far) using the freeware version, if it matters. Would it
be possible that some of the non-freeware versions handles
this issues better ?

Regards
Jan-Erik Svderholm

Jan-Erik Svderholm
S:t Anna Data
tel : +46 121 42161
mob : +46 70 5241690

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2002\09\30@155702 by Olin Lathrop

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> Q1: Is it possible to make Eagle insert some extra wire's
> while autorouting ?

Yes, sortof.  Tell Eagle that you are doing a double sided board.  Set the
cost for the top layer very high, like 10 or 20 and set the via sizes to
make pads for your manual jumper wires.  Etch the bottom layer as usual,
then manually solder wires where Eagle created tracks on the top layer.


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Embed Inc, embedded system specialists in Littleton Massachusetts
(978) 742-9014, http://www.embedinc.com

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2002\09\30@163813 by Quentin

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A manual way is to add pads where you want to jump and then manual route
(an icon on the side bar) the track to the pad from the one end and
manual route from the other end to the other pad, leaving an airwire
between the pads.

Quentin

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2002\09\30@183454 by Bill Westfield

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I think there's an included paramater file for pseudo-one-sided routing
included with Eagle (ctl/1sided.ctl or something?)  It has the high cost
settings for the upper layer and (I think) enlarged via sizes that someone
mentioned.  I wasn't terribly impressed.

I usually let the autorouter do as much as it can on one layer, and route
the remaining tracks manually.  The middle mouse button ("change layer")
is useful here - you route along the bottom from one pin to a convenient
place for a jumper to start, click a segment endpoint, change layers, route
along the top, then change layers again at the other side of the "jumper."
The other useful technique is to simply manually route on the bottom
(crossing and shorting the autorouted tracks) and then using "change layer"
to move part of the trace to the "top" (where it becomes a jumper.)

Note that eagle won't usually do a good job of guessing which signals are
most appropriate for jumpers; if you have a good idea, you can route your
jumpers FIRST and then let eagle autoroute the rest.

BillW

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