The Knock Box: Build a Knock-Sensitive Power Strip

The Knock Box is a power strip with superpowers - it turns on your lamp whenever you knock on your nightstand. You get two outlets, individually controlled by knock-knock-knocking on a nearby hard surface. It's great for hitting the lights when it's pitch dark, but if an appliance can plug into the wall, you can toggle it! Control your lamp, turn on your fan, kill your alarm clock, or start the music in sty ...

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