This circuit acts as a safe and can check the code that you insert.
It has 7 buttons. The horizontal ones allow you to insert the code. The vertical one allow you to check if the code inserted corresponds to the code setted by me. If it's right, you'll see that the green LED will work, otherwise the red one will light up. For set a code you have 6 buttons: two every display. The high one allows you to count up; instead, the other, counts down. Please, leave a comment if you like my work.
