I will try as best as I can to explain what I want to do. I have got a 4 x 4 matrix keypad where is used for password insertion. I want to apply a restriction for the user.. The user will have a certain period of time (that I will set) to insert the password. After the passing of the set time the user wouldn't be able to insert the password anymore.
In other words what I want to do is a function that will be active for x seconds of time (where the user wIll be able to insert the password)
Any advice would be helpfull