Make Your Own Motion Activated Arduino Music Player With The Sparkfun MP3 Player Shield - YouTube
Amazon.com: SparkFun Sensor Kit, Reed Switch, 0.25" Magnet Square, Flex Sensor - 2.2" PIR Motion Sensor, Mini Photocell, Large Piezo Vibration Sensor - with Mass and More! : Electronics
SparkFun Launches Panasonic PIR Sensor Breakout Boards
PIR + LEDS + Pots. Not working passed 4.42v from the brightness pot - Sensors - Arduino Forum