Hi Guys, I am trying to make a codepad access system for one of the doors at the office. Does anyone know of a way to store numerous four digit codes within the Arduino or external memory and have them checked instantly?
Ideally when the user types in there code, the Arduino compares that there code to the stored codes and if there is a match then the door is released.
I am not even sure where to start on this one so any help would be greatly appreciated.
Thanks in advance, Alex