How to auto-route in only .brd file

On 4/01/2018 12:57 p.m., Tanvir Ahmad wrote:

I have a .brd file with 100 pairs of through-hole vias (see the green vias in attached image). Each pair is supposed to be used as power and ground for micro-devices.

 

The via's outer diameter is .5 mm and the actual via hole is .15 mm. Since it is quite difficult to solder to such small vias to wires, I was thinking about routing traces from vias to pads for pin headers at the edge of the board.

 

The problem is since this is a .brd fle and there is no other components except vias I cannot use the autoroute function. Is there a way to auto-route the traces from vias to pads for external header connectors?

 

 

 

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Hi

I suspect your approach may not be the best.

A few questions:

Does there have to be a trace out to the header pin for every via?

That's 200 header pins. Or if they are power and ground can all the

grounds and power vias be connected and a single trace taken to a 2 pin

header?

Do your micro devices have wires that fit through the 0.15mm holes?

Perhaps they are surface mount devices.

Even when working with just the board it is usually preferable to use

packages from a library. That would give you a pad or smd to run a

signal between on the board an then the auto router will work.

Let us know

Warren

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Eagle must know the signal name of connected vias.

Name them, after there are unrouted "ribbons" between equal named vias (Layer 19).

Hi Warren,

Thanks for your feedback.

These microdevices are two terminal devices which need to be powered separately. I can try to tie all the grounds together into one pin, but I still need 100 power pins for independent operations of the microdevices.

On 4/01/2018 9:32 p.m., J. Martens wrote:

Eagle must know the signal name of connected vias.

 

So give them one and you see the connection as ribbon on layer 19 tha can be routed.

 

 

 

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When there is only the board, the above does not achieve the

airwires/nets/signals. Rememeber there is no schematic and hence there

are no known nets or connections.

When creating the SIGNAL it cannot be connected to the via but if the

signal is created first and then you name the via, it will pick up an

airwire.

The problem is, the OP talks of a header where one pad of which connects

to the via. To get the signal in the first place, the header pad needs

to connect to another pad or SMD. It cannot be established to a named

via. Once you have a signal between two pads, you can view the name of

the signal on the header pad and then name the respective via and an

airwire will appear. Then you can delete the unwanted airwire and the

other package that was used to get a pad temporarily for the first step.

HTH

Warren

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On 01/04/2018 05:24 PM, warrenbrayshaw wrote:

On 4/01/2018 9:32 p.m., J. Martens wrote:

Eagle must know the signal name of connected vias.

 

So give them one and you see the connection as ribbon on layer 19 tha

can be routed.

 

 

 

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To view any images and attachments in this post, visit:

https://www.element14.com/community/message/233082

 

 

When there is only the board, the above does not achieve the

airwires/nets/signals. Rememeber there is no schematic and hence there

are no known nets or connections.

 

When creating the SIGNAL it cannot be connected to the via but if the

signal is created first and then you name the via, it will pick up an

airwire.

 

The problem is, the OP talks of a header where one pad of which

connects to the via. To get the signal in the first place, the header

pad needs to connect to another pad or SMD. It cannot be established

to a named via. Once you have a signal between two pads, you can view

the name of the signal on the header pad and then name the respective

via and an airwire will appear. Then you can delete the unwanted

airwire and the other package that was used to get a pad temporarily

for the first step.

 

HTH

Warren

 

 

 

I would suggest that the OP create a simple schematic, then build the

board from that.  Taking the little bit of time to do this will greatly

reduce the probability of a wiring mistake being made.

Best regards,

    - Chuck