Arduino Uno Quick Start Manual page 210

Chapter 11. Creating a Burglar Alarm with Email Notification 194
Figure 28 A typical SMTP session on the Arduino
Off-the-shelf sensors hide these details, so you can use a single digital pin to
check whether someone is moving in the sensor s field of view. The Parallax
6
PIR sensor is a good example of such a device, and we can use it as the basis
of our burglar alarm.
Figure 29 Top and bottom of a passive infrared sensor
6. http://www.parallax.com/product/555-28027
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