Ok, the board was autorouted with lots of parts placement manipulation to make traces as short a possible. Here's a blowup of the pads. I figured the top & bottom would be 2 solid planes connected by vias. Yet the tops got split up funny.
I make the ground traces thicker manually, they seem to revert to thinner every time I rip them up and let them play out again as I move parts around.
After the routing was done I tried adding polygon to make a ground plane.
What makes the ground plane actually connect to ground? The ground plane also made a couple of signals become disconnected. Not sure its doing much for me. Is there a better way to add that?
@pito, 1. There is no conflict - the battery holder is on the bottom of the board. All conflicts except for "stop mask" errors were taken care of, I will be cleaning up the Reference Designators next. 2. X1 on the DS1307? 3. 32K crystal has been layed over. Traces have been cleared away. 4. Am trying that again, see if it helps. 5. Went with a coin cell that I could easily find a holder for. 6. I don't know why Arduino original design had Aref located diaganolly opposite on the board from the Analog inputs. Ihave rerouted the Aref signal away from the power supply section. 7. Will review the 'big' electrolytics.