Core2duino (Updated)

Step 2 Download and print the .brd file

You need a Laser printer. Don't try it with an Inkjet as it will not work.  I have heard bad things about Brother laser printers using strange toner that doesn't transfer to copper, but I use a Brother 7020 and it works great. I have tried several different types of magazine paper and i'm sure that most will work, but if in doubt, use Cosmopolitan. It works well and if you know any women, you should find quite a few of them nearby.

1. Download the  .zip file and EagleCad if you don't already have it.
2. Unzip the .zip file to your computer.
3. Open the .brd file with Eagle.
4. Select the "Layers" option and de-select the "top" layer, leaving the other options as they are.
5. Select Print, make sure you check the boxes "Black" and "Solid" under Options. Then Print to magazine paper.

Carefully cut the printed design to the size of your copper clad. Use a razor blade or scissors, just be sure not to touch the toner with your fingers.

Comments

[Asuraku]

In revision 4, the one without the extras, what is the value for the capacitor? And I assume that the resistor is for the LED and not a diode or something.

[johndavid400]

the capacitor is probably not even needed, unless you are going to be flashing a bunch of LED's or something that might draw excess current from the base Arduino. I put it there to give the core2duino some extra juice if needed... so I would use a short (in height) electrolytic capacitor, whatever value you have between 50uf and 250uf (10v or higher). You want the capacitor to be about the height of the female headers, so you can add a shield on top later if you like. Also, I would use either a 1/8w or 1/4w, 330ohm resistor and a 3.5mm LED for the power light.

hope this helps,
~jd

[johndavid400]

also, not sure if said much about the Eagle file, but:

The red lines are jumper wires. There should be a 10k resistor underneath the 28pin dip-socket for the Atmega168 (it is the pull-up resistor for the reset button).
The reset button goes above the atmega (I put 2 sets of holes for different size buttons). The 16mhz crystal oscillator goes to the left of the atmega, orientation does not matter. The 2 holes to the right of the LED resistor should be populated with (2) .1" male shrouded breakaway headers (these are the VIN selector jumper pins and are only needed if planning on using the power input from the Core2duino). The outer-most set of Arduino pins on each side should have the stackable headers. The inner-most set of pins use the regular female headers.

Again, you will want to solder the stackable headers first! you will be able to more easily access them with the soldering iron.