An Embedded System Project using ATmega32 Microcontroller

The main function is enabling the user to put the valuable things in a locker and put a password that isn't deleted even if the Micro-controller power is off.

1. Buzzer.
2. Keypad.
3. LCD.
4. Microcontroller(Using ATmega32).

1. First time the saved password is 0000.
2. User should enter 0000 to open locker at the first time.
3. To change the password:
   • The locker must be open(And if the locker is closed already and you try to press on B button, The system will reject that action and output a message on the LCD to inform you).
   • The user should press on B button then enter the new 4 digits password.
     • If he entered less than 4 digits, The system will reject that password and output a message on the LCD to inform him that's password too short.
     • If he entered more than 4 digits, The system will reject that action before pressing on B button and output a message on the LCD to inform him that's password too long.
   • The user must press on B button again To save the new password.
   • The Buzzer will be ON for 3 second then OFF once the user press on B button.
4. Pressing on any button will make the Buzzer ON for 100msec.
5. To close the locker:
   • The user should press only on C button.
   • And if the locker is closed already and he tries to press on C button, The system will reject that action and output a message on the LCD to inform him.
6. To open the locker:
   • The user should enter the 4 digits password then press only on D button.
   • And if the locker is open already and you try to enter the password, The system will reject that action and output a message on the LCD to inform you.
   • If you enter a wrong 4 digits, The buzzer will be ON for 3 second then OFF.
   • If you enter less than 4 digits, The system will reject that password and output a message on the LCD to inform you that's password too short.
   • If you enter more than 4 digits, The system will reject that action before pressing on D button and output a message on the LCD to inform you that's password too long.
7. To reset the password, If the user forgot it:
   • If the locker is open:
     • Pressing on '0' for 5 second.
   • If the locker is closed:
     • The developer should flash the software again.
     • If the user presses on '0' button for 5 second, The system will reject that action and output a message on the LCD to inform him).