It's a loop circuit on a shoe. I put copper tape around the shoe and finally put the battery on the bottom. Because there is a small gap underneath the sole of the shoe, the light won't come on when it's not on (no pressure). This is because the battery and the copper tape do not fit together. The light comes on when the person is wearing it or in the shoe based on pressure sensation. So when a person puts on the shoes, the light does not come on when the foot is lifted, but it comes on when the foot is dropped.
The reason I made this is because I wanted to have an illumination feature for people walking at night or in darker times. This design can be more energy efficient. Of course, if you want it to stay on all the time, you can stick a sponge on the ground where the battery touches the ground. Then there will be no gap between the battery and the copper tape.
This design puts the wiring on the latch, and the circuit can be formed by placing copper tape and tin foil in the center of the latch and locking pin, respectively. Since there is a distance between them, tin foil is used instead of copper tape because the tin foil is thicker, so it allows them to be connected together. I folded the tin foil into a thick layer and placed it between the gaps. This design allows the light to come on when the door is unlocked and not when the door is closed and locked.
The reason for this design is that I wanted to remind people to turn on the light when the door is unlocked. This way you can clearly see and confirm that the door is fully closed. My intention was to make this item as useful as possible rather than just looking good. So I think this lock design is a useful one.
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