By: Advanced Tech, Fredericton, NB

The first types of motion sensors used were the ones that used ultrasound or radio waves or only a simple IR detector. They had no intelligence what so ever and caused lots of false alarms. Squirrels, mice, spiders, or even a fly could set your alarm off.

Now with the modern chips and better sensors, the motion sensor recognizes what moves in front of it, just by looking at…