Free 4-layer PCB software?

FlyingFishFinger

We can probably do our project with two layers, but I'd rather not cause it'd get bigger than we want. This is a core processing unit about the size of a Basic Stamp, modelled after an Arduino Nano.
However, the free version of Eagle (which our team lead is familiar with) and the free version of DipTrace (which I have used) both only can do two layers. Is there any good PCB software out there that can do 4 layers?
Thanks

Rafael

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UC Berkeley '12 EECS
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Duffer

ExpressPCB: http://www.expresspcb.com/·can create both 2-layer and 4-layer boards. It's free, but the files created are only usable for board fabrication·by ExpressPCB and cannot be used by other PCB manufacturers.

Duffer

FlyingFishFinger

Yeah I've played with that before, not such a fan. Our team has a deal with AC circuits though, we get free fab. So it'd be nice to be able to send designs to them...

Raf

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UC Berkeley '12 EECS
CalSol: Berkeley Solar Car team
www.calsol.berkeley.edu
KJ6AWU

Leon

The Advanced Circuits software is nicer. It's actually a special version of Number One Systems' Easy-PC. I think that they give you the Gerber's etc. if you order a second board.

Leon

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VIRAND

This might be a dumb idea because I thought about, but never ever actually needed a 4 layer board,
but maybe you can use 2-layer board software to make 2 or 3 thin boards with the same holes and then build on
all of them stacked together. It seems like the most obvious way to me to manufacture one at this moment.

Another idea maybe having 2 boards stacked with pins and headers. I can't imagine why anyone would think
they need 4 layers while using a free trial version of board software, unless it's stuffed with BGAs or has
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FlyingFishFinger

Well I don't know if we NEED 4 layers to make it work, but seeing as the Arduino we're basing the design off of needed 4 layers to fit in the footprint... we're adding / removing a few components but it's essentially the same thing. We're trying not to increase the footprint too much because it's supposed to be quick-swappable CPU unit on our boards..
Nice font btw [noparse];)[/noparse]

Raf

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UC Berkeley '12 EECS
CalSol: Berkeley Solar Car team
www.calsol.berkeley.edu
KJ6AWU

Harrison.

I would definitely use Advanced Circuit's PCB Artist. It's pretty good when compared to other free packages handed out by PCB manufacturers (the DRC and consistency check features are excellent). I've used it during a class project and found it to be much better than ExpressPCB.

There are some 'hidden' problems with using PCB Artist though. It is a pretty unstable piece of software (although it has been getting better with the later versions). It can crash randomly, so save very often. The built in libraries are also much less reliable than Eagle's (in fact, there were a number of parts totally wrong in the libraries, which we were lucky to catch before manufacturing). If you do choose to use PCB Artist, I would recommend you make every part by hand, except for maybe resistors and capacitors.

RickB

Free PCB. 16 layers

http://www.freepcb.com/

mctrivia

use eagle to design 2. 2layer boards. then rename the gerber files on the 1 board 2 be the inner 2 layers. this will work if all wholes and vias are in same spot

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24 bit LCD Breakout Board now in. $21.99 has backlight driver and touch sensitive decoder.