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Have a question about CadSoft EAGLE?  Ask our Expert, Jorge!

Jorge_Garcia

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Jorge Garcia

I'm a young engineer with extensive experience working on EAGLE. My interests include Power Supply design and LED solid state lighting, and I'm always impressed by a well designed PCB.

 

 

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  • I'm doing a layout that has a circular array of LEDs packed tightly together in an approximately 320 degree circle.  Based on the size of the board (really small) and the number of LEDs (really large), there is a need for precision device placement.  I use a script to place the LEDs exactly where they need to be.  All the LEDs origins are centered on a circle.  I've got the syntax for device placement, radial orientation, and rotation mastered.

     

    The script works fine for placing the LEDs in their appropriate position and that hasn't presented a problem.However, there's one thing that I have not been able to discover by reading the Eagle documentation nor by experimentation.  I need to be able to orient the LED cathodes so that they are all pointing radially inward.  Is there any way to force device orientation (i.e. make certain that it's the LED cathodes and not the anodes that point radially inward) based on pad or pin name or some other attribute?

     

    I've been able to accomplish this by "pre-orienting" all the LEDs on an unrouted area of the board and then run the script.  What I mean by this is that I'll manually move all the LEDs to some arbitrary area of the board and orient them so that their cathodes all point to the right and then run the script.  The script places the LEDs exactly where they need to be with the desired cathode orientation.  If I flipped the LEDs so that the cathodes all pointed left during my "pre-orienting", the cathodes all wind up facing radially outward.  So, the device placement rules are at least consistent.  However, this is a pretty kludgy way to accomplish something I'd like to be able to do entirely via script.

     

    Is there a way to do this via script?

  • My question lays in the autorouting and/or wiring algorithm. Can you describe for me, in great detail, how the autorouting system works? Where is the file that handles this? Would you explain the major points of that as well? How does the entire EAGLE program determine the best/shortest route to lay wires? This is a question of efficiency.

     

    Thanks again!

  • in reply to autodeskguest

    On 09/10/2013 04:55 PM, Jorge Garcia wrote:

    On 9/6/2013 8:14 AM, Chuck Huber wrote:

    On 09/06/2013 05:45 AM, Hafiz Muhammad Mujahid wrote:

    I have generated output files for fab house but all layers are mis

    aligned from IPC? Can you please help me to figur out the issue.

     

    Refer to my post in this newsgroup on 26-Mar-2013 titled "Re: Gerber

    files and Pick and place file".

     

    This will identify the problem and show you how to fix it.

     

    HTH,

         - Chuck

     

     

    Thanks Chuck,

     

    Additionally, it important to make sure that in a CAM job all of the

    tabs have the pos. coords check box in the same state. It doesn't

    matter if it's checked or unchecked as long as all of the tabs have it

    set the same way.

     

    Jorge,

     

    Wouldn't it make sense, then, to make the pos. coords. check box a

    property of the job and not each section?

     

    Maybe it's time to move away from the .ini format to an XML format for

    .cam files.  While the dev's are at it, they can break out combined

    properties, such as the Flags value, into individual boolean properties.

     

    Perhaps this is better suited for the suggest forum.

     

        - Chuck

     

  • in reply to dukepro

    On 9/6/2013 8:14 AM, Chuck Huber wrote:

    On 09/06/2013 05:45 AM, Hafiz Muhammad Mujahid wrote:

    I have generated output files for fab house but all layers are mis

    aligned from IPC? Can you please help me to figur out the issue.

     

    Refer to my post in this newsgroup on 26-Mar-2013 titled "Re: Gerber

    files and Pick and place file".

     

    This will identify the problem and show you how to fix it.

     

    HTH,

         - Chuck

     

     

    Thanks Chuck,

     

    Additionally, it important to make sure that in a CAM job all of the

    tabs have the pos. coords check box in the same state. It doesn't matter

    if it's checked or unchecked as long as all of the tabs have it set the

    same way.

     

    Best Regards,

    Jorge Garcia

     

  • in reply to e14 Contributor

    On 09/06/2013 05:45 AM, Hafiz Muhammad Mujahid wrote:

    I have generated output files for fab house but all layers are mis

    aligned from IPC? Can you please help me to figur out the issue.

     

    Refer to my post in this newsgroup on 26-Mar-2013 titled "Re: Gerber

    files and Pick and place file".

     

    This will identify the problem and show you how to fix it.

     

    HTH,

        - Chuck

     

  • I have generated output files for fab house but all layers are mis aligned from IPC? Can you please help me to figur out the issue.