View Single Post
Old 08-25-2009, 08:28 AM   #2 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location: ÿ
Posts: 5,038

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 158
Thanked 269 Times in 212 Posts
2 and 3 are the external interrupt pins, they are special because they can differentiate between a rising signal and a falling signal. So essentially one pin fires a tiny bit of code when the injector opens and one the other one fires a tiny bit of code when it closes.

This eliminates any guesswork in the interrupt.

The LCD wires were chosen because they were convenient for standard arduino layout and left some multi purpose pins open. Will probably change in the prebuilt code someday.
__________________
WINDMILLS DO NOT WORK THAT WAY!!!
  Reply With Quote
The Following User Says Thank You to dcb For This Useful Post:
nickdigger (08-25-2009)