![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg9TJ91GH6ZkoFRaJwBe8gk1tol8Dxo_Urlc-FqUwUq4n6nSvo0UfCMecev5IQg2wNNOpfnFwaVjxn5eh1oRoX7sv3GlkkEVY-Id5OFBTmMIkenbWpe1VyIBG2iBnXyZCv7dkkA3vzH0No/s320/WP_000212.jpg)
- enter 4 digits, only one set of combination will be correct(hence password)
- if the incorrect combination is entered, a red LED will light up, followed by a warning buzz
- if the correct combination is entered, a green LED will lit up, followed by a victory song
- resets after each trial
- includes 10 buttons, where each represents a digit(0-9)
- yellow LED's indicates the number of digits entered
- red LED is the warning light
- green LED is the "victory" light
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgAbzrNMqE8Mu1PEd5otsdgsFjIMCX7TNW4UYblzjKhwoSliLpXKqdjz5K2MkyZdZmvqGn1-gKL8qoIo3BFyJMuQyYCGSFD5FYsusQyciUhfORI0BJSwCGE6z0_Ogt6rhBTrZco_DnqnTWK/s320/WP_000214.jpg)
parts:
- 1x 74HC595 shift registers
- 4x yellow LED's
- 1x green LED
- 1x red LED
- 10x buttons
- 10x 10k ohm resistor
- 6x 330 ohm resistor
- 1x buzzer