No Airwaves on Changed Parts

Op Sun, 30 Dec 2012 08:47:12 +0100 schreef Justin Mayer 

<noreply-154744@element14.com>:

Hi there. I'm back using Eagle after being away from it for 5 years. 

I've got a problem that I just can't seem to solve. I designed a board 

and had it manufactured and then discovered there were some problems. 

Starting from that original design, in the schematic I deleted 3 parts 

and replaced them with different ones. I changed some of the wires as 

well. The schematic looks good but when I go to the board there are no 

airwaves going to the 3 new parts. All the other components are still 

connected. I could really use advise on how to solve this problem.

Thanks much, Justin Mayer

 

Hello Justin,

It seems that the parts only look to be connected, but in reality are not. 

Try to pick up one of the changed part in the schematic and MOVE it (F7). 

Do the nets that should be connected move with it? Have you run ERC?

I could be useful if you told which version you are using.

Richard

Thanks so much for getting back to me Richard. I'm running Eagle 6.3.0 Mac. You are spot on! They aren't connected. I wonder why? I have been having some strange connection problems that might be caused from changing the grid resolution around but I'm not sure. Isn't there usually a little sound that the computer makes when a connection is made? Then again I'm using a new part that I designed. For all I know there's something wrong with it. But I am now having problems with a connection to a resistor that I didn't before I changed the grid resolution around.

Any ideas?

Thanks again. Justin

Op Mon, 31 Dec 2012 04:08:53 +0100 schreef Justin Mayer 

<noreply-154744@element14.com>:

Thanks so much for getting back to me Richard. I'm running Eagle 6.3.0 

Mac. You are spot on! They aren't connected. I wonder why? I have been 

having some strange connection problems that might be caused from 

changing the grid resolution around but I'm not sure. Isn't there 

usually a little sound that the computer makes when a connection is 

made? Then again I'm using a new part that I designed. For all I know 

there's something wrong with it. But I am now having problems with a 

connection to a resistor that I didn't before I changed the grid 

resolution around.

Any ideas?

Thanks again. Justin

 

Hello Justin,

Before the champagne (and other assorted new year goodies) make my answers 

completely useless....

There can be different reasons for nets not connecting. You said you 

changed an existing project. If you remove a symbol (that is, on the 

schematic) and 'drop in' a new one with identical connections, the nets 

won't usually connect. You have to move or extent the nets onto the pins. 

MOVING a NET to a SYMBOL works, MOVING a SYMBOL to a NET usually doesn't. 

I assume you do use NET not WIRE because you have worked with Eagle before.

Those unconnected pins should be in the output from the ERC. You should 

probably run that a couple of times while working on a schematic.

Also, you should not change the grid on the schematic. All Eagle lib's use 

0,1" as the standard grid (and that's fine for your own parts also) and 

you'll run into more problems than needed if you change that. The grid on 

the board can be anything you like.

If you just want to get the parts back onto grid pick 'm up with CTRL+ 

left click (I guess CTRL is something else on an Apple). That could be the 

trouble with the resistor.

Good luck and a great 2013 to everyone,

Richard

Thanks Richard. My resolution setting was too high in the schematic window.

Happy New Year, Justin