Wokwi - Online ESP32, STM32, Arduino Simulator

[Tiny Tapeout Puzzles](https://tinytapeout.com/digital_design/)

Set a code for your precious safe!

**Controls**
* Switches 1 to 7 are used to enter the code
* Switch 8 sets the code to the current entry (i.e. value of switches 1 to 7)
* Reset locks the safe
* Entering the correct code unlocks the safe

The 7-segment display shows "L" if the safe is locked and "U" if unlocked.

### To begin

Press the green button in the top left of the pane to begin the simulation.

Set the clock to free-running mode (move the switch towards the "10k" signal).

Enter your desired code using switches 1 to 7.

Turn ON switch 8 (to set the code), then turn it OFF.

Change the switches 1 to 7 (to avoid instantly unlocking the safe).

Push the RESET button (to lock the safe).

Start entering codes on the switches 1 to 7.
The safe should unlock when you enter the corrent code.

Setting the code?

Code bit 1

Bit 1 wrong?

Code bit 2

Code bit 3

Code bit 4

Code bit 5

Code bit 6

Code bit 7

Bit 2 wrong?

Bit 3 wrong?

Bit 4 wrong?

Bit 5 wrong?

Bit 6 wrong?

Bit 7 wrong?

Bit 1 or 2 wrong?

Bit 3 or 4 wrong?

Bit 5 or 6 wrong?

Any of bits 1-4 wrong?

Any of bits 5-7 wrong?

Any bit wrong?

All bits correct?

Unlock the safe

Safe is unlocked

Lock the safe

Reset

Lock state

Setting the code?