Unconventional Switch: X-ACTO Knife

For our unconventional switch, we have created a circuit that lights a blue LED when an X-ACTO knife has its cap on. When you separate the knife from its cap, the LED turns off. As the cap is made of nonconductive plastic, we had to cover it in aluminum foil. We used a Circuit Playground Bluefruit with a USB as our power supply, making the power source 5V. We originally had a 220Ω resistor, but we had switched to a 100Ω one after finding the desired resistance for our switch circuit. The main idea behind the switch is to have the light shine to show you that the X-ACTO knife is safe and protected.