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Yellow lines when autorouting?

brightnight

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.image

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  • 0

    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 image)

     

    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 image

    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

              Any feedback would be appreciated image

     

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  • 0 in reply to gsgill112

    In general, can I solve this problem by setting my minimum drill width to be smaller or do I really just need to route my wires better? Right now it's set to .012 inches (0.304 mm). When I finish my board I was going to send it to 4pcb.com to have it made. It says on their website:

    Trace/space: 5 / 5 Mils

     

    So I assume I have to reroute my connections because my traces must be larger then 3mm according to the 4PCB specs.

     

    I went though an eagle YouTube tutorial but will also go through the one that is suggested above.

  • 0 in reply to brightnight

    Hi Pete,

     

    You are correct in going through the manufactures specification and then feeding those parameters into the DRC. image I would suggest to Route your wires better. Actually Not even routing You can go through your layout and first before even beginning routing have your schematic handy and figure out which all components are associated with which all IC. group them nearby and then use the rotation and placement tool and start placing them on the board layout.

     

    once all the components are placed you will have a mess of AirWires all over use the Ratsnest tool to optimise airwires. and the rotation tool if you feel that reduced the clutter. then start by routing the most obvious traces that are shortest and absolutely straightforward.

     

    As a general Advice,

     

         1.     I would recommend atleast 6-8mil traces even if the manufacture says 5 mil as min, and power rails to have a 12-20mil trace . Just to be safe.

     

         2.     Have a Min trace clearance of 8-10 mils should be fine.

     

         3.     Having a smaller drill size id not a very good option as it will be difficult to rework on the board if you make a mistake so 0.34 seams fine.

     

         4.     have a min of 12Mil drill bit clearance.

     

     

     

    Finally the above guidelines are for beginners and if you are comfortable with getting closer and you trust your manufacturer then go for the above mentioned values.

     

     

     

    Hope this helps,

     

    Regards,

     

    GS Gill

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  • 0 in reply to brightnight

    Hi Pete,

     

    You are correct in going through the manufactures specification and then feeding those parameters into the DRC. image I would suggest to Route your wires better. Actually Not even routing You can go through your layout and first before even beginning routing have your schematic handy and figure out which all components are associated with which all IC. group them nearby and then use the rotation and placement tool and start placing them on the board layout.

     

    once all the components are placed you will have a mess of AirWires all over use the Ratsnest tool to optimise airwires. and the rotation tool if you feel that reduced the clutter. then start by routing the most obvious traces that are shortest and absolutely straightforward.

     

    As a general Advice,

     

         1.     I would recommend atleast 6-8mil traces even if the manufacture says 5 mil as min, and power rails to have a 12-20mil trace . Just to be safe.

     

         2.     Have a Min trace clearance of 8-10 mils should be fine.

     

         3.     Having a smaller drill size id not a very good option as it will be difficult to rework on the board if you make a mistake so 0.34 seams fine.

     

         4.     have a min of 12Mil drill bit clearance.

     

     

     

    Finally the above guidelines are for beginners and if you are comfortable with getting closer and you trust your manufacturer then go for the above mentioned values.

     

     

     

    Hope this helps,

     

    Regards,

     

    GS Gill

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