Every time that I design a PCB I connect the TOP layer and BOTTOM layer to GND (GND pour). With this PCB I finally ended with an "isolated island", without possibility to use the TOP or BOTTOM layer as GND. I did added a VIA near the cap, but is it a good choice? And if yes, what's the raccomended dimension for the hole for the via?

This is the picture:

enter image description here

Update: PCB without the VIA and Eagle complaining:

enter image description here

  • \$\begingroup\$ I'm confused by your definition of island.. but that aside I see two GND pins adjacent to those caps on the 328P..why the via. \$\endgroup\$ – Trevor_G Dec 26 '17 at 10:17
  • \$\begingroup\$ Without that VIA, the GNDs of the two caps are not connected, Eagle complain about airwires.... I added an image without that VIA. \$\endgroup\$ – sineverba Dec 26 '17 at 10:22
  • \$\begingroup\$ That's fine..but u can route to pin 8 or 22 .. and run that Vcc above the cap not below it. \$\endgroup\$ – Trevor_G Dec 26 '17 at 10:25
  • \$\begingroup\$ @Trevor you are right! I can connect and "solve". Bytheway, only to learn, is better connect to 22 or create the VIA? The via is the "devil"? \$\endgroup\$ – sineverba Dec 26 '17 at 10:27
  • \$\begingroup\$ Rerouting Vcc above will give you the space for the ground to connect / fill to pin 8. \$\endgroup\$ – Trevor_G Dec 26 '17 at 10:28

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