The switch that I made uses my bedroom door to turn on the blue LED. I used a 9V battery but I didn't have a battery cap so I used two alligator clips, a red for positive and black for negative. the negative was connected to the bread board directly and the positive was connected to a piece of tinfoil on the door. The second piece of tinfoil is connected to the doorframe and leads to the bread board where electricity flows to a 330 ohm resistor and then the blue LED. when the door is closed the two pieces of tinfoil connect and complete the circuit and the LED lights up.
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