Or...SX1509 which has built-in keypad scanning!
Or about $0.65 each for the 2 shift registers at Digikey.com
Plus all the mounting including those bypass capacitors.
I didn't say, cheaper, I said easier, neater and using fewer pins which may already be shared with other devices. 
Well, we've certainly given @roland345 plenty of options.
This topic was automatically closed 120 days after the last reply. New replies are no longer allowed.