Hey guys -
I was wrestling with the layout last week and here's what I came up with.
http://magicsmoke.downingterrazas.com/wp-content/uploads/2009/05/multiduino-2layout.jpg
There are a couple notable things which differ from my sketched layout:
- Still no DC jack, I've got one picked and that corner of the layout is pretty wide open
- Arrangement of the CPUs is different, there was just no way to fit them in a 2x2 stack with a 2-layer board
- Arrangement of the CPU2-4 pinouts, again, just turned into a rats nest of wires in the earlier arrangement. Everything is spaced on 0.1 intervals so it's breadboard friendly.
- CPU select switch has been moved towards the middle for easier routing
- Few silkscreen items still missing (header next to CPU1 analog in is for I2C out)
Overall size is 3.3x5.95 with a little bite out of the top left corner. Only mounting holes are the standard three from Decimilia.
Only SMT components are the FT232RL chip, most caps, resistors, and LEDs. Everything else is through hole.
Once I wrap up a few final details I was going to get a quote for probably about 50x boards and I'll probably have the PCB house procure and solder on the SMT components. Depending on the interest I may also get some fully built with all thru holes done or at least order parts so they could be kitted.
If you're interested in a bare PCB, board + SMTs soldered, board + SMT + other components kitted, or finished PCB let me know.