Abstract:
The proposed system is intended to protect electrical appliances with a simple lock system. As for passcode, a 4 bit binary number is used. To input the pass code, four two state switches are utilized. The pass code is stored in a memory. It can be changed after unlocking the lock system using valid pass code. We use D type flip-flops as memory. The comparator unit compares input codes with the stored code to generate the signal required to open the lock. The system is hardware implemented and has the versatility in application.
