PIR (motion) sensor ID: 189 - $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Adafruit Industries, Unique & fun DIY electronics and kits PIR (motion) sensor ID: 189 - PIR sensors are used to detect motion from pets/humanoids from about 20 feet away (possibly works on zombies, not guaranteed). This one has an adjustable delay before...