AVR-Chat

I find the eagle autorouter to be pretty dumb.  While you can control 
it via a fairly complex set of options, it still makes some pretty 
stupid decisions and will run some very circuitous traces. Also, it 
only routes 100% for the simplest boards.  

I use autorouting to see if my placement is reasonable and then ripup 
the routing and do it manually.   I am able to get much tighter 
layouts and shorter average traces with manual routing.  Also, you 
can see how to make changes in the schematic or layout to get a 
simpler board.  Pin swap is particularly useful to simplify routing.  
I've gotten single-sided boards where the autorouter gives up at like 
70%.

--- In AVR-Chat@yahoogroups.com, "Dave Miller" <dave@c...> wrote:
> Hello,
> 
>  
> 
> The Autorouter option is only available if you have a netlist.  A 
netlist
> can either be imported or created when you draw the schematics.  I 
have
> always used Eagle to draw my schematics then create a PCB from my
> schematics.  This will create the necessary netlist file that will 
allow
> autorouting.
> 
>  
> 
> Thanks,
> 
> Dave Miller
> 
> Cipherlab
> 
> 888.825.7713
> 
>  
> 
>  
> 
>   _____  
> 
> From: jay marante [mailto:jaythesis@y...] 
> Sent: Tuesday, July 06, 2004 7:30 AM
> To: AVR-chat@yahoogroups.com
> Subject: [AVR-Chat] OT: Eagle 4.11 layout editor
> 
>  
> 
> sorry for the OT. i just don't know where to ask these questions.
> 
> i know a little about the eagle lay-out editor. i do manual tracing 
of PCB.
> but i know there is this "auto-routing" thing where the PC routes 
the tracks
> for you, like the protel design systems'. 
> i don't know if i understand what i've read correctly, but, am i 
right that
> you can write a program (text) in eagle for all the connections or 
the
> components to be connected like in VHDL instead of dragging 
components and
> connect them yourself? if ever, how do i do that?
> also, how do i auto-route?
> and, how can i make a "gerber" (right spelling???) file for me to 
download
> it into a milling machine?
> or maybe, can someone lead me to a tutorial site?
> 
> thanks for the help...
> 
> -jay
> 
>  
> 
> 
>  
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