security system for a bank using AVR

security system for a bank consists of:

- LCD (4-bit mode)

- Keypad

- buzzer

-Leds

at first, a welcome message will be appeared on LCD, and then you will be asked to enter password

you will enter the password via keypad, and every time you press a button on keypad it will appear on LCD

=> if password is correct a message will appear on LCD, and a green led will turn on.

==> else (password not correct), you have 3 chances to enter the password

-- if you entered the password wrong 3 times A bomb will explode (the buzzer will make a sound and a red led will blink)

when you press a button on keypad it will appear as (*) on LCD

when you enter password 3 times wrong, a 7-seg will count down from 9 to 0 before explosion