Sensors
Introduction
Sensors are devices that detect motion, temperature changes, wind velocity, and other indoor and outdoor environmental changes in order to sound an alert, log an event, or trigger a device. The Global Positioning System (GPS) is a form of sensing system, in that it polls several signal sources to pinpoint the location of a device. But there are now sensors that can provide location information that don’t rely on satellites for the positioning data.
Cameras are sensors that detect light intensities and sometimes color frequencies, but since they are covered earlier, this chapter focuses on sensors in the nonvisible optical spectrum, such ...
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