Since I have no electronic knowledge and this is the very first assigment about the electronics. I have decided to copy exactly the same that
chris de vries  have in his page.

here is my eagle files
sch
board



here is the codes
makefile
ccode



I have managed to program the board but the led have never worked... I suppose the value of the resister that I have used for  R2 (499ohm) is too big for the led and the led is broken.
I have also tried to change the led and the resistor to 1kohm but it seems I did something wrong when desoldering because later I did never manage to reprogram the board again.
Tried to change attiny44 but did not make sense-to difficult... During the process I forgot taking photos. Here is the last situation of my led board...a mess...