assignment
redraw the echo hello-world board, add (at least) a button and LED (with current-limiting resistor), check the design rules, and make it.

the PCB HELLO.2012
A small PCB driven by an AVR ATtiny44 with 1 button, 1 RGB LED, 1 simple LED.

the design
For the design of the board I used the program EAGLE Layout Edition. Its a freware version that you can download from the EAGLE website.
I used the Fab library (Fab.lbr) and two comercial libraries from SparkFun (SparkFun.lbr) and AdaFruit (adafruit.lbr).
The board button is attached to PB2 , The RGB LED is attached to PA7, PA3, PA2. The simple LED is attached to PA5, also connected to the MISO pin. I had done a double jumper to connect one of the resonators pin to the microcontrollerbecouse it was impossible to fit the traces better.