In Reply to: how to design security system using microcontroller and telephone line posted by mohd ariffanan mohd basri on 07/01/02 at 3:59 AM:
Can anyone help me with the assembly code for a security system by using a 68HC11 microcontroller in expanded mode.
The requirement is as follow:
"Design an electronic safe that unlocks when the correct 4 digit code is entered. Disable the system for 10 seconds after 3 unsuccessful attempts. The door is opened and closed by pressing buttons. Use a visual indicator to show the status of the door. There should be audible feedback for the various operations. An LCD displays appropriate messages."
Pls, reply me A.S.A.P. I need it urgently.