Yellow lines when autorouting?

Question

1)I'm wondering what the yellow lines are once I've auto routed? For example, the yellow line going to C4(top of picture next to C8), or the yellow line from the IC top right pin going to the diode. Are they lines that should be couldn't be routed for some reason? If so why was the problem, it routed some thought the bottom and then back up by using Via's....so is that's the case, why not these?

2)When I ran the DRC I got a number of warnings for the width of my IC pad. First time making a PCB so lots to learn. Any suggestions or advice appreciated.

gsgill112 · Accepted Answer

Hi Pete,

Ok, So First of all I can see you are using Eagle Tool,

Yellow Lines are called as AIR wires and that simply means that those Pins/Pads were supposed to be connected to each other as per the Schematic and are not Routed on Board Layout.

Simply Put They are unrouted signals (Not Good )

As per your second part of the Question, In any CAD Software, we have something as Design Rules They specify some of the simple things that tell the CAD software like EAGLE how to autoroute. like the Trace Width, clearance distances between two traces, no of bias permitted, via type and did, and so on. They are few defaults that Eagle sets on its own. Now if you run a auto router and there are some issues that eagle cannot fit the wires within the space it will leave them for the user to route, i.e. Yellow Wires.

For Example, The top left trace that goes from TSSOP14 to C4 not Eagle as per the design rules cannot insert a via in between the two traces as the Via Dia or the via clearance would not fit the constraints.

I would recommend going through this link

https://learn.sparkfun.com/tutorials/using-eagle-board-layout

Regards,

GS Gill

P.S-> Pl Share and Subscribe to my You tube Channel : https://www.youtube.com/channel/UC98erU8wYeEA-VqmTA9etNw?view_as=subscriber

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Yellow lines when autorouting?

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