So I'm building this glass table, and i'm going to put a few led's around the edges so i can light up the table if i need to find something in the dark (like while watching a movie). and I want a cool way to turn on the light, so I was thinking about making a circuit that when you tap the table fairly hard it would light up for a few seconds and then slowly fade to off. I'm a mechanical engineer so my knowledge of circuits is limited. the problem with using a microphone is that it will pick up other loud sounds, like a slamming door etc. so if you have any ideas let me know.