I am having trouble designing a 4 by 4 key pad circuit with an 8 bit output. I am using a straight ring counter as the shift register and either a 74LS273 or 74C922 latch for the outputs. I am having trouble connecting my logic gates (andor) to the columns for the key press detect. Any help would be grateful even just a point in the right direction.
$12 is a GREAT deal as far as I'm concerned. Digikey's least expensive 4x4 keypad is $13.66 and NONE of them have the right legend - alphanumerics for hex entry, arrow keys for the cursor (I use multline LCDs with menus), clear, entry, and even a damn "Help" button! (I include "help" files on my test fixtures so the techs won't bug me so much)