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I'm looking at the EAGLE board file from the Arduino wiki page, and I feel like I must be missing something - none of the ground pins of U1 appear to be connected to anything:

Arduino Pro Mini

As you can see, the GND pin on the bottom right is unconnected, as is the GND at pin 5. The GND at pin 3 is connected to a via which goes... nowhere?

Here's the board file with just the top layer showing, for further clarity:

Arduino Pro Mini - Top Layer

For more weirdness, you can see here that there's a weird trace going off to nowhere from the ground side of the upper decoupling cap.

Admittedly I'm not used to using EAGLE, so I tried the brute-force approach of enabling every single layer in case I was missing an obscurely named inner layer or ground pour, but as far as I can tell there's no connection at all.

What am I missing? Is the board file missing stuff, or have I got something hidden?

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  • \$\begingroup\$ I changed the question/title to reflect a failure of Eagle to tell that you needed to run a command instead of a failure on the design (a lack of ground connections). If you disagree with the change please revert it. \$\endgroup\$ – Wesley Lee Oct 16 '17 at 20:05
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    \$\begingroup\$ @WesleyLee Edited slightly to be a bit more generic. \$\endgroup\$ – Polynomial Oct 16 '17 at 22:21
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Do a "Ratsnest" command for Eagle to render the planes/polygons.

Unrendered on the left, rendered on the right. Ground highlighted.

I'm only showing layers 1, vias and pads here.

enter image description here

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  • \$\begingroup\$ Excellent, thanks! Knew there was something weird going on; didn't realise a lot of the functionality in EAGLE is hidden behind commands like that. Good to know. \$\endgroup\$ – Polynomial Oct 16 '17 at 19:59
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    \$\begingroup\$ @Polynomial - glad to be of help. I generally don't like Eagle very much but I can't get away from it because of typing the commands. After you get used to it it is quite faster than clicking buttons on the UI. \$\endgroup\$ – Wesley Lee Oct 16 '17 at 20:02
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    \$\begingroup\$ My usual is Multisim/Ultiboard, so I'm a bit spoiled. \$\endgroup\$ – Polynomial Oct 16 '17 at 20:03

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