Airwire/Ratsnest problem with jumper

not sure what your question is. maybe you need to click "ratsnest" to

recalculate the wires? or your jumper is defined as 2 different pins on

different nets so they no longer connect?

Wayland Bugg wrote:

Sorry, I thought it was obvious. In the picture attached, I have

highlighted an airwires with "Show objects" to demonstrate that the

highlighted portion is no longer considered by Eagle to be part of what

I am now guessing is called a net. Ratsnest will not calculate the

shortest path. You can see that it is a much shorter path to go from

R2/R3 to C2, instead of all the way over to C1. I used "Wire" and not

"Net" to create the schematic. I added the jumper after creating the

schematic by deleting a section of wire and re-wiring through the jumper.

 

Wayland

Try to bottom post. Each side of the jumper is a different net since you

broke the net and inserted the jumper. So the rats nest air wires look

correct to me. Highlight the other side of the jumper and see what

should be connected. Also do the same in the sch.

Paul R.

Paul Romanyszyn wrote:

Wayland Bugg wrote:

Sorry, I thought it was obvious. In the picture attached, I have

highlighted an airwires with "Show objects" to demonstrate that the

highlighted portion is no longer considered by Eagle to be part of

what I am now guessing is called a net. Ratsnest will not calculate

the shortest path. You can see that it is a much shorter path to go

from R2/R3 to C2, instead of all the way over to C1. I used "Wire" and

not "Net" to create the schematic. I added the jumper after creating

the schematic by deleting a section of wire and re-wiring through the

jumper.

 

Wayland

Try to bottom post. Each side of the jumper is a different net since you

broke the net and inserted the jumper. So the rats nest air wires look

correct to me. Highlight the other side of the jumper and see what

should be connected. Also do the same in the sch.

Paul R.

This worked perfectly on at least 5 other jumpers but not this one. How

do I get the jumper to be part of the net? Whats the right way to add a

jumper?

On Tue, 24 Mar 2009 21:56:16 -0400, Wayland Bugg

<theguy@waylandbugg.com> wrote:

This worked perfectly on at least 5 other jumpers but not this one. How

do I get the jumper to be part of the net? Whats the right way to add a

jumper?

It may not be the way you added the jumper.  It might be the way you

added traces.  It seems the only way to get Eagle to recognize a trace

as part of a net is to add it using the "Route" funciton.  If you add

a trace using the "Add Trace" funciton, Eagle does not count it when

computing where to put airwires.  You can tell if the trace was added

correctly by trying ot delete it (using Delete, not Rip-up).  If you

try to delete a trace that was added with Route, then Eagle will not

let you do it.  It will say you can't do this in the board.  Do it in

the schematic instead.  But if Eagle lets you delete a trace without

complaint, either you are not editing with a consistent schematic, or

the trace was put there some way other than with the Route function.

Robert Scott

Real-Time Specialties

Ypsilanti, Michigan

Robert Scott wrote:

On Tue, 24 Mar 2009 21:56:16 -0400, Wayland Bugg

<theguy@waylandbugg.com> wrote:

 

This worked perfectly on at least 5 other jumpers but not this one. How

do I get the jumper to be part of the net? Whats the right way to add a

jumper?

 

It may not be the way you added the jumper.  It might be the way you

added traces.  It seems the only way to get Eagle to recognize a trace

as part of a net is to add it using the "Route" funciton.  If you add

a trace using the "Add Trace" funciton, Eagle does not count it when

computing where to put airwires.  You can tell if the trace was added

correctly by trying ot delete it (using Delete, not Rip-up).  If you

try to delete a trace that was added with Route, then Eagle will not

let you do it.  It will say you can't do this in the board.  Do it in

the schematic instead.  But if Eagle lets you delete a trace without

complaint, either you are not editing with a consistent schematic, or

the trace was put there some way other than with the Route function.

 

 

 

 

Robert Scott

Real-Time Specialties

Ypsilanti, Michigan

Thanks for the post. I am at Mich. Tech. and surprisingly, nobody has

been able to help me out with this yet. Ok. When I try to delete the

airwire or routes it tells me that I must do it in schematic. ERC

doesn't report any inconsistency between the board/schematic. I suppose

I could start over. Is there a way to generate a new board from a

schematic? Would that fix anything?

Wayland

Hi Wayland,

If you want that the net name is the same on both sides of the jumper, you

just have to re-connect an airwire between its two pins.

It seem that you want to route a single side (on bottom only), but you can

avoid to add jumpers in schematic in using the top layer instead: simply add

two vias of the same diameter as your jumper wire and add a trace on the top

layer between theses two vias.

So you can keep the continuity of the net.

Christian Bohrer

"Wayland Bugg" <theguy@waylandbugg.com> a écrit dans le message de news:

gqdgcg$4i2$2@cheetah.cadsoft.de...

Robert Scott wrote:

On Tue, 24 Mar 2009 21:56:16 -0400, Wayland Bugg

<theguy@waylandbugg.com> wrote:

 

This worked perfectly on at least 5 other jumpers but not this one. How

do I get the jumper to be part of the net? Whats the right way to add a

jumper?

 

It may not be the way you added the jumper.  It might be the way you

added traces.  It seems the only way to get Eagle to recognize a trace

as part of a net is to add it using the "Route" funciton.  If you add

a trace using the "Add Trace" funciton, Eagle does not count it when

computing where to put airwires.  You can tell if the trace was added

correctly by trying ot delete it (using Delete, not Rip-up).  If you

try to delete a trace that was added with Route, then Eagle will not

let you do it.  It will say you can't do this in the board.  Do it in

the schematic instead.  But if Eagle lets you delete a trace without

complaint, either you are not editing with a consistent schematic, or

the trace was put there some way other than with the Route function.

 

 

 

 

Robert Scott

Real-Time Specialties

Ypsilanti, Michigan

 

Thanks for the post. I am at Mich. Tech. and surprisingly, nobody has been

able to help me out with this yet. Ok. When I try to delete the airwire or

routes it tells me that I must do it in schematic. ERC doesn't report any

inconsistency between the board/schematic. I suppose I could start over.

Is there a way to generate a new board from a schematic? Would that fix

anything?

 

Wayland

On Wed, 25 Mar 2009 10:51:10 -0400, Wayland Bugg

<theguy@waylandbugg.com> wrote:

... When I try to delete the

airwire or routes it tells me that I must do it in schematic. ERC

doesn't report any inconsistency between the board/schematic.

That is all good.

I suppose

I could start over. Is there a way to generate a new board from a

schematic? Would that fix anything?

No, probably not.  I'm still not clear what is broken.  I guess this

the heart of what you are doing:

..R3 to C2, instead of all the way over to C1. I used "Wire" and not

"Net" to create the schematic. I added the jumper after creating

the schematic by deleting a section of wire and re-wiring through the jumper.

This is still not clear.  When you delete a section of wire in the

schematic, the schematic assigns a new random name to one of the

resulting nets.  Then when you add a jumper, I assume you are

connecting one of those nets to one pin and the other net to the other

pin.  If you want to back up and give it another try, go back to the

schematic and delete both the wires to the jumper.  Then use the

"info" tool to determine the net name for both nets that you had

connected to the jumper.  Those names had better be different, or else

something is wrong with your schematic.  Then re-connect the jumper in

the schematic.  Again check the net names on both sides of the jumper

to make sure that are still different.  Then go to your board.  There

should be an airwire to each pin of the jumper.

Robert Scott

Real-Time Specialties

Ypsilanti, Michigan

On Tue, 24 Mar 2009, Wayland Bugg wrote to us saying :

This worked perfectly on at least 5 other jumpers but not this one. How

do I get the jumper to be part of the net? Whats the right way to add a

jumper?

Why do you want to add a jumper?

There are two possible reasons I can think of.

First reason is that you want to be able to isolate part of the circuit

by removing the jumper from the board. In this case, the two sides of

the jumper are explicitly separate nets and MUST NOT be connected any

other way. Eagle is behaving correctly for this case.

The second reason (and I suspect this is the case) is simply that when

laying out your single-sided board, you are unable to achieve all the

links you want. In this case, I'd suggest the jumper is NOT WHAT YOU

WANT. It's not really part of the circuit, it's just an implementational

anomaly. What I recommend you do, if this is the case, is not show it on

the schematic at all, nor even on the board directly. Design the board

using a short bit of track on the top side (i.e. as a double sided

board). I know you aren't going to etch it as a double sided board, but

if the top copper contains only three or four short links you can just

etch the bottom side and treat the top side as a guide to where the wire

links need to be fitted.

--

Rob Pearce                       http://www.bdt-home.demon.co.uk

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