“The goal of this instructable is to create a simple lockable box that can be opened by solving a puzzle. The puzzle must be interesting, easy to understand and it must be possible to solve it with the help of a pen and paper (or straight from the head). The system will be controlled by arduino.
This project is inspired by the game Submachine 1: The Basement, created by Mateusz Skutnik. It’s a logical adventure, released in 2005 and I’ve enjoyed the whole series since I was a kid.
Original version is very simple. There are four bells and four cubes in the room. The ringing of each bell interacts with a different combination of cubes. If a cube is down, it will rise when the bell rings, and if it is raised, it will fall. (So the bell changes the state of the assigned cubes.) The goal is to find a combination that picks up all the cubes and then, the secret compartment opens. In my variant, the bells will be replaced by buttons and cubes will be replaced by LEDs. Contestants who approach will receive a single instruction - use the buttons to light up all 9 LEDs!
BOM:
9x LED
9x LED holder
9x 1k resistor
6x push switch
6x 10k resistor
arduino nano
9v battery
9v battery connector
2x 1n4148 diode (or 1n4001)
spst switch
dc connector (3 pin)
cable wires 5v relay (Omron G5V-1)
solenoid, electromagnet or servo
dcdc buck converter
(if you want to use bicolor leds, you will need an extra 9x 2n3906 transistor and another 18x 1k resistors)”