4-Digit Combination Lock - DEC Keypad

Can you guess my password? :D Operating Instructions Below! - The switches represent a decimal numerical keypad in this order: 1 2 3 4 5 6 7 8 9 0 The last switch to the right of the 0 switch is the circuit clock (CLK) signal. Instructions: How to enter a number: 1) Select a logical switch from the numeric keypad and enable it to 1 (HIGH). 2) Select the clock (CLK) switch and set it to 0 (LOW), wait for the number to appear on the displays. 3) Select the CLK switch again to disable it with value 1 (HIGH) and the selected keypad switch to 0 (LOW). When the correct 4-digit number is entered, the red LED will switch off and the green LED will switch on! Congratulations :D 4) Profit????? Notes: - Zoom in so that all four 7SDs are in view along with the logical switches in the bottom left corner for easier switching. - The top right side of the simulation contains a shift register, bottom right contains a DEC to BCD converter, and the bottom middle contains the correct password logic.

published 9 years ago