So what have we learned? First, while all motion sensors work the same way in principle, when you put them into security ...

The components, which can include door/window sensors, motion sensors, cameras, smoke detectors, glass-break sensors, panic buttons and more, work together to keep you and your home safe.

[Brad] was asked by his Sister to design a motion-based alarm that would help her catch ... What he came up with is a light-sensitive motion sensor that uses very little power.