re: resistor values, 220ohms as per the tutorial.
I prefer sinking current when driving LED's.
ah, i need to this in the software to tell the 595 to sink, right? thanks, will read up some more.
you've been very helpful, the 595's are a very cheap option. I got a lot of 10 for ~P 132 from ebay. can i find them cheaper in local stores?
EDIT: looks like i have to use ULN2803 or some other transistor array to make sinking happen. kala ko pwede sa software.