Airwires in Eagle pcb

[venkates2218]

Please refer the image.
In this image the airwire(Yellow box) have to be in red box point.But some times the airwires are dislocating from the actual point.
How to solve this error..?

 

[KlausST]

Hi,

This is no error.
An airwire has no fix place. ..and you can´t move the airwire to a desired place.
You know "air" is not conductive, therefore it is no true connection. It just shows you that you still have to connect both signal segments.
It usually is at the place with smallest distance. (between endpoints of wires)

The problem is how you defined the signals and how you wanted to do the connection.
You want it to be ONE signal, but you treat it as TWO signals.

Method 1): If you want it to be one signal and don´t want it to show the airwire.
The easiest way to get rid of the issue:
Place a wire on the TOP (or any other layer) layer from TP5 to TP6. Then EAGLE knows it is connected.

Method 2): If you want it to be one signal and you know you have an external connection between TP5 and TP6.
(EAGLE doesn´t know about the connection)
--> just ignore the air wire.

Method 3): My favourite: Treat them as two signals.
Create a new package that shows an extra wire as connection between two points. Two THM pads with the distance [TP5 - TP6]. A wire in tPlace layer to show the jumper wire.
Create a symbol with two pins and a "virtual" connection between them.
Create the device.
Use the new device to "join" your two signals.
--> benefit: The jumper wire is in your partlist and in your assembling list.

Method 4): (similar as above): Treat them as two signals.
Use a THM resistor with value "0 Ohms" to connect both signals.

*****
I´m no friend of one-sided PCBs. Nowadays it´s almost impossible to comply with EMI/EMC/ESD rules or datasheet recommendations with a single sided PCB. Don´t be surpriseed if it doesn´t work as it should..or it is sensible to EMC.

Klaus

 

[Edison517]

Like KlausST said, an air-wire is simply a visual representation of the place where a net has the shortest distance of a break in connectivity. Normally you don't want any air-wires as they indicate that the copper isn't 100% connected (that's sometimes misleading, if the trace is under a pad but not touching the center of the pad; it's still connected copper, though).

Since it looks like you want to use a jumper wire to connect those traces, I would ignore the air-wire, but personally, I might make a library/part that represents a jumper wire so the air-wire would go away.

 

[Relayer]

Hello venkates2218,
You can manually join the air-wires (un-routed) to the points they need to go to and eliminate
any errors.

(1) Click on the "Route" icon on the left hand side
(2) Change the layer setting to what you require (top left)
(3) Click the "Wire Bend Style 1" 2nd one in, from the right of layer setting
(4) Change the width settings to the same width as the tracks already shown in your PCB layout (roughly top center)
(5) Next to the width setting, select the via shape to what you like
(6) Next to the via shapes, select the diameter of the via (I usually use: 2.1844mm, as I find this good for via size and drill hole)
(7) Next, select the drill size. It should be no less than 0.9mm, as tinned copper wire for links are usually that diameter
(8) Click the "Wire Bend Style 1"
(9) Click on the top air-wire in your layout and move it to the center TP5. You'll notice it will go over the same track. That's fine.
(10) Do the same for the air-wire below that and move it to the center of the IC pin, at the same time following the contour of the
original tracks wire bend.
(11) Next, click on the center of TP7 and move it one grid space (1.27mm) to the left but don't double click it to cancel it.
It should show a short track with your cursor still attached to it.
(12) Go up to layer setting and change it to "1 top" (red)
(13) Next, go to the track width setting and change it to say 0.6096mm
(14) Move your cursor back to the new short track you made, click the track and cross over the other tracks and follow it down
to and past the track close to where TP8 is located - at least one grid length. This track should be in red, plus it will have created
one side of your link with a via
(15) Click where you need to place it, but don't double click it. Now go back up and change the layer setting to what ever your
bottom tracks are, then change the width to the same as the bottom tracks
(16) Now move your cursor to the track of TP8, "click" and that should complete the circuit.

You can move the via closer to TP8's track if you like, but as long as the via doesn't encroach on any other tracks.
Hopefully that should solve your air-wire problem and should no longer give you any errors.
Please let us know how you get on.
Regards,
Relayer