1. Chris Bent

2.  Electronic sensor that measures infrared (IR) light  Do not detect motion; detect changes in temperature  Emits nothing; it’s “passive” ◦ Responds infrared energy radiated by the object

3.  Small  Inexpensive  Low-Power  Easy to Use  Don’t Wear Out

4.  Pyroelectric Sensor: detect levels of infrared radiation  Looks to detect motion (change) not average IR levels

5.  Humans skin temperature is about 93 ° F, and radiate infrared energy with a wavelength between 9 and 10 μ m ◦ The sensors are sensitive in the range of 8 to 12 μ m  Plastic Housing limits the wavelengths to 8- 14 μ m

7.  Suitable for Enclosed Spaces  Burglary Alarm Systems  Cameras  Office lighting PIR Camera

8. http://www.ladyada.net/learn/sensors/pir.html