Motion in the dark focuses on arduino programming and techniques to induce motion or vibration through sensors in the dark. The system includes the use of breadboard, a motor, a battery, and a sensor.
The typical IR motion detectors (like the things with the little milky-white “window” on security lights) emit no light or infrared of their own; they rely on picking up infrared radiation given off by people. So, yes, they work just fine in complete darkness.

They “view” the scene through a special type of Fresnel lens and an aperture grill that is something like a picket fence. These are arranged so that as a person crosses the area “seen” by the detector, the IR they give off alternately comes through and does not come through the vertical openings in the grill, so it alternately reaches and does not reach the sensor. Thus movement across the field results in a changing output of the sensor. The sensor does not need to see anything like images – all it detects is changes in the level of received IR. A sensor with an ordinary lens and no grill would NOT detect any changes as someone moved across the field.

These sensors do, however, rely on the people being *alive.* A dead body will, within a few days at most, cool to the temperature of its surroundings, after which its movement through the area will produce no change in the motion detector’s sensor.

So, these passive IR motion detectors will be useless as perimeter or zone sensors during the forthcoming zombie apocalypse.

Ultrasonic motion detectors do emit something: ultrasonic sound. They work by detecting changes in the resulting standing wave field caused by reflections of this ultrasonic “sound” from moving objects. They work in complete darkness as well. And they WILL work on zombies.

however, this particular programming works on the generation of light activating sensors that will induce vibrations. might be useful as an innovative burglary prevention system, as the burglar cannot start any form of light as it will alarm the sensor.


vishnu jadia