Eagle 8.5.1 Air Wire Errors

On 31/12/2017 4:28 a.m., Richard Arndt wrote:

With Eagle 8.5.1 I have air wire errors that I can not figure out how to correct (see attached).  I am modifying a PWB create in previous Eagle version, by adding one tri-color LED.  Both pins 1 (Din) and 2 (VCC) of the LED show air wires, and it is so small that I can't zoom in to see it.  Pin 3 (GND) routes fine to the GND polygon.  I have tried re-routing these two lines many times, with exact same results.  Guidance please.

 

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Hi Richard

I suggest that you open the schematic and move the led and observe if

the nets remain attached to the pins. Doing this could show up nets that

are not connected to the pins. If that looks OK, next run a ERC check to

see if that reveals any clues. Not likely as airwires seem to be present

and so Eagle believes an airwire is justified between two points.

Next, back on the board, move the LED ( you may care to record its XY

location so you can return it to the current location later.

When the led is moved do the routed traces at the pins move with the

led? If not another question arises, did you use the ROUTE command to

add the traces  which will snap to pads and airwire ends or use the WIRE

command which wont snap to airwire ends and so you can be left with tiny

airwires?

With the LED moved, run the DRC, Hope fully the airwires may be larger

now and then you will be able to get INFORMATION (net name) from them.

Then I would try to pick them up with a route command. CliCk ROUTE and

then click on the end of the airwire. Then drag out a route to somewhere

convenient so you can then learn something about the signal name of the

airwire.

I assume this is a double sided board. Check you have the layers defined

correctly in the DRC.

Questions: Is the schematic and Board consistent?

HTH

Warren

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On 12/30/2017 10:28 AM, Richard Arndt wrote:

With Eagle 8.5.1 I have air wire errors that I can not figure out how to correct (see attached).  I am modifying a PWB create in previous Eagle version, by adding one tri-color LED.  Both pins 1 (Din) and 2 (VCC) of the LED show air wires, and it is so small that I can't zoom in to see it.  Pin 3 (GND) routes fine to the GND polygon.  I have tried re-routing these two lines many times, with exact same results.  Guidance please.

 

--

To view any images and attachments in this post, visit:

https://www.element14.com/community/message/232872

 

Attachments:

airwire.PNG

 

Richard,

From the board layout editor, go to Options -> Set -> Misc and set the

Catch factor to 0.

Then, start a route (Edit -> Route), and click anywhere in the layout

editor.  The nearest air wire will start to route.  Move the cursor

around and zoom in and out to locate the air wire.

By setting the catch factor to zero, the Route function will pick the

nearest air wire without limitations on how far that air wire is from

the click location.

Hope this helps,

- Chuck

Hi Richard, This was reported on the main Autodesk EAGLE forums just before Christmas. They've identified the cause now I believe and it'll be fixed ASAP.

Hi Chuck, in EAGLE v8 (not sure the specific version it became available), you don't need that catch factor trick anymore as airwires have a section in DRC so you can find them easily by clicking on them in there.

Best Regards,

Rachael

As a follow up, Autodesk have released a bug fix release 8.5.2 which can be found here.

This release fixes the known airwire issue and also an issue with incorrectly highlighting nets and showing them on other pages when adding to an existing net.

Best Regards,

Rachael