Two Arduinos!

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hi everyone,

i posted little earlier charlieplexing problems, have had new idea.

i have inherited uno friend, theoretically 10 led meter tutorial @ http://arduino.cc/en/tutorial/bargraph 2 arduinos , therefore twenty leds? or 24 if bring pins 12 , 13 in play!

does have advice how go doing that?

would increase array @ beginning of code e.g:

int ledpins[] = {
  2, 3, 4, 5, 6, 7,8,9,10,11 }; 

what numbers use follow 11 if wanted next led connected pin 2 of next arduino?

also, hook 2 arduinos using rx tx , grd?

thanks!

a single max7219 display driver chip using spi (3 or 4 pins) can control 64 leds , uses 1 resistor set led current. 


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