When the katana rests within it's scabbard, it releases a signal light to show that the armory rests. However, war is no longer won purely through honor, as thievery and schemes conquer the battlefield. Should a light be out, The blade keeper can react to something amiss amongst the base camp.
My teammate and I (Anthony Caruso and John Collera) created a sword which completes a current when resting in its scabbard. We used masking and electrical tape to cover the conductive parts of the scabbard, and stuck tin foil on opposite sides of the scabbard entrance. We used a 9V battery so the sword wouldn't have to be tethered. The LED used has a voltage of 2V and a current of 0.02 amps. We deduced that the desired resistance was 350 ohms, which was achieved with 4 100 ohm resistors.
We then wired a breadboard so that there would be contact with the aluminum foil on both sides of the scabbard, but the current would only be able to travel when conductive material bridges both pieces of aluminum foil (intended for katana).
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