Re: gEDA-user: how to add a rat to a via?

[Dave N6NZ <n6nz@xxxxxxxx>]

Lope De Vega wrote:
> Hello,
> 
> I've got a chip on my layout. In gscheme I didn't bind
> some of it's pins, though I'd like to, once in pcb,
> add a via and connect the pin to it, How do you use to
> do this?

Are you trying to add "break out" pads so that you can get to the pins 
in a prototyping area?  The cleanest solution to that problem that I've 
come up with is to insert a very simple symbol into the schematic, and 
assign it a footprint that is just a pin with an appropriate drill and 
annulus.  That way everything appears in the netlist and all tools are 
happy.  You can turn off DRC and force the trace, but I'd rather not try 
to outsmart DRC.

This symbol consists of one pin and a circle.  The refdes is in under 
sized text to keep clutter off the schematic, but you could easily tweak 
that.

$ more protopad-1.sym
v 20060123 1
T 300   0 5  5 1 1 0 1 1
refdes=P?
T 300 600 5 10 0 0 0 0 1
device=PROTOPAD
T 300 800 5 10 0 0 0 0 1
uselicense=unlimited
T 300 1000 5 10 0 0 0 0 1
distlicense=GPL
T 300 1200 5 10 0 0 0 0 1
description=Prototyping pad
T 300 1400 5 10 0 0 0 0 1
numslots=0
T 300 1600 5 10 0 0 0 0 1
footprint=proto22pad
T 300 1800 5 10 0 0 0 0 1
author=DB Curtis n6nz@xxxxxxxx
T 300 2000 5 10 0 0 0 0 1
copyright=(C) 2006 David B. Curtis
P 0 0 125 0 1 0 0
{
T 100 20 5 8 0 1 0 3 1
pinnumber=1
T -200 320 5 8 0 0 0 6 1
pinseq=1
T -1100 320 5 8 0 0 0 6 1
pintype=pas
}
V 200 0 75 3 0 0 0 -1 -1 0 -1 -1 -1 -1 -1


Here's a pad to go with it, I have several:

Element(0x10 "Prototyping pad, #22 wire" "" "" 200 200 0 100 0 100 
0x00000000)
(
     # 11-Jun-2007
     # hand generated
     # clearance 8 mil
     # mask relief 4 mil
     # Slightly oversize pad for easier soldering, but
     # should allow two 8 mil tracks between pads on 100 mil ctrs.
     Pin(0 0 58 16 66 35 "" "1" 0x00000001)
)

-dave


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