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GND plane

bdoubleu

I try to make a ground plane like in this video   https://youtu.be/CCTs0mNXY24?t=691  and I get it to make the plane fine.  I hit the ratsnest button and you can see the little lines connect my ground stuff to the plane, and it also shows the clearances and stuff around components like this video show.  but here's where the problem comes in.  If I auto route, I get no traces to the components... if I go delete all the work from the ground plane and auto route it routes just fine and it connects all the grounded components through this long and winding traces... so why won't it route with the ground plane... seems like that would be easier... am I missing a setting that allow it to route around and through this ground plane?  what gives?

 

EDIT:  Since I did not get any replies, I set the video to the time of when the ground plane is being made....so you don't have to watch the whole video to see what I'm getting at.  If you don't want to watch the video, basically, I draw a polygon, then rename it as GND (same as my grounds) and it makes the whole board a ground plane, then I ratsnest and autoroute and it won't autoroute anything... if I remove/undo the ground plane it autoroutes fine and connects a long ground trace to all of my grounds.  I supposed I don't have to have the ground plane but thought it would be nice.

 

thoughts?  note that I'm a rookie at this.. and this board is for educational purposes for my 12 year old son... trying to get him interested in programming and engineering.

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    well i think i got it... i changed the "effort" from low to high and it actually put traces down on the board.... so not sure why low wouldn't do it... don't even know what that setting does other than the obvious...

  • 0 in reply to bdoubleu

    On 26/08/15 01:17, Brandon Wilson wrote:

    well i think i got it... i changed the "effort" from low to high and it

    actually put traces down on the board.... so not sure why low wouldn't

    do it... don't even know what that setting does other than the

    obvious...

     

    I'm not a user of autorouting - it always produces bad layouts that take

    longer to fix than I would take routing by hand - but it seems to me

    that there would be occasions when you want to "have a go" at routing

    new airwires without major disruption of what's already there. If that

    fails, you may choose to manually help it along, rather than letting it

    randomly rip up everything until it hits on a poor solution. That could,

    I suppose, be described as "have a go but don't put much effort into

    it", so the "effort" setting could be for that.

     

    What you did by filling the ground plane before routing, was to block

    all the possible routes it could take. Then, by asking it not to put in

    much effort, you set an impossible task, which it failed at. Allowing

    more effort lets it rip up your ground plane to find a route.

     

    Now somebody who's actually used the autorouter will come along and

    correct all my misunderstandings.

     

     

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  • 0 in reply to bdoubleu

    On 26/08/15 01:17, Brandon Wilson wrote:

    well i think i got it... i changed the "effort" from low to high and it

    actually put traces down on the board.... so not sure why low wouldn't

    do it... don't even know what that setting does other than the

    obvious...

     

    I'm not a user of autorouting - it always produces bad layouts that take

    longer to fix than I would take routing by hand - but it seems to me

    that there would be occasions when you want to "have a go" at routing

    new airwires without major disruption of what's already there. If that

    fails, you may choose to manually help it along, rather than letting it

    randomly rip up everything until it hits on a poor solution. That could,

    I suppose, be described as "have a go but don't put much effort into

    it", so the "effort" setting could be for that.

     

    What you did by filling the ground plane before routing, was to block

    all the possible routes it could take. Then, by asking it not to put in

    much effort, you set an impossible task, which it failed at. Allowing

    more effort lets it rip up your ground plane to find a route.

     

    Now somebody who's actually used the autorouter will come along and

    correct all my misunderstandings.

     

     

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