Warning:

This mod is out of date and unsupported, sorry!

Motion Detector

The motion detector is a multipurpose redstone output. You can use it to trigger automatic doors, traps, lights, just about anything. There are two different types of MotionDetector: one created with wood that triggers when any living creature is nearby, and one created with more stone that only triggers when the player is nearby. You can change the range of the MotionDetector by right clicking it.

The recipe is shown in the video.Visit the minecraft forum thread for discussion and feedback.
You must first read the installation instructionsOnly works on Minecraft Version 1.5.1Download