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The locker is with uniform dimension of 13*8*1.2 in3. It has a modular design with three keyholes diameters (3, 2, and 1 in) while other designs keep the same. The locker is connected to the wall with four M6 screws on each corner. As for the player, they need to fit the hose with the right size into the keyhole. The RFID reader in the back of the locker would tell whether the hose matches exactly. One trick is to watch the LED clocks on the top side of the locker. The longer time gap is, the more money the locker is. When the hose matches the keyhole, digital signal transfers from the locker to the vacuum for further process.
Following are the front views of the three lockers. The hollow keyholes have uniform width of 0.2 in and thickness of 0.2 in. When in the game, the player needs to insert the hose into the keyhole and holds it till money is vacuumed from the locker. When the game ends, the hose drops to the ground since the keyholes are too hollow to hold. In this way holes and keyholes are auto-reset. A hose only has light LED circuits and a RFID button so it is robust for frequent drops when their components are covered and cushioned.
Textures of clocks and keypads are pasted on the locker surface. Although they are not functional, players could tell how much money inside the locker from the time gap between the two clocks. As mentioned above, four M6 thread holes are left for screws to fix the locker onto the wall.
The sides of all the lockers are the same. They all come with circular fillets with 0.2-in radius on the top surface to avoid injuries
The bottom side of the blocker has a uniform 8*6*0.8 in3 space to insert the RFID reader. A Gowoops RFID reader enclosed in the case is put inside space with wires connected to the Arduino controller through space between the walls.
