Ryan from Googlemarks brought us the NERF Rifle a short time ago. Well he is back at it, this time he has built a microcontroller based capacitive sensor.
“Capacitive sensors have historically been regarded with fear and hostility among hobbyists. They’re notoriously flaky, unreliable, and difficult to design. Further, they traditionally fall in the “analog domain” which is something the casual microcontroller hobbyist can sometimes wince at. They usually require fancy shielding, and are unsettlingly sensitive to changes in things like temperature, humidity, air pressure, cosmic radition, my girlfriends feelings, and the mushroom kingdom stock market index.”