Precise package layout in Eagle

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Jevin
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Location: Lafayette, IN
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Posted by Jevin: Mon. Dec 22, 2008 - 07:12 AM
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I am making a flash/debug cartridge for my Game Gear handheld of yore. I am making my own PCB for this and I need to, of course, lay out the edge connector in the CAD software. I've tried this in Eagle (5.3, if it matters), and even being very meticulous, I ended up with some pretty bad results where the edge connector didn't have the right spacing. I tried setting the grid spacing to be a multiple of the distances between the center of the pads, but that only helped a bit. It seems that when moving a pad in Eagle, it considers the "center" of the pad to be wherever you clicked on the pad, not the actual center. I wish there was some way to simply say "add a pad at location ". Can this be done with ULP? Would ULP-added pads be "snapped" to whatever resolution grid is currently being used? Does anybody else have experience with precise layouts in Eagle?

Thanks,
Jevin

Math is cool.
jevinskie.com

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Learning and Information, General Electronics
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leon_heller
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Posted by leon_heller: Mon. Dec 22, 2008 - 09:57 AM
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With the software I use (Pulsonix) I simply set the coordinates of a pad relative to another one, then add as many as I want with the same spacing. I can also use the grid if I want to.

I can't believe that Eagle doesn't let you do something similar.

Leon

Leon Heller G1HSM

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ka7ehk
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Posted by ka7ehk: Mon. Dec 22, 2008 - 03:26 PM
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Eagle has a command to select at the center of the pad. Command-click or control-click or something like that. Use that with a MOVE command and you can get them right on (within the limits of your grid).

Jim

 

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