For his sensor, [Felix] is using a Moteino, a very tiny Arduino compatible board with ... it transmits a code the base station where the ‘motion’ alert message is displayed.

This voltage can be read by an Arduino digital input and then the Arduino can act upon it. The PIR Motion Sensor on the left is made by Parallax and sold by Radio Shack. The one on the right comes ...

The Leap Motion controller is a rather impressive little sensor bar that is capable of ... The actual code being sent to the Arduino is pretty simple. The Leap Motion SDK does all the complex ...

Make sure the adjustment knobs for sensitivity and on-time for the motion sensor are facing up so you can modify how sensitive your device is and how long it stays on to signal your Arduino.

All you need is an Arduino, a motion sensor, a few wires and headers, and the code provided at the site below. Hit the link to see step-by-step instructions on how to put it together.