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How Does a Motion Detector Work?

First developed for World War II, motion detectors have come a long way from the radar that pilots used way back then.
Android Authority

Philips Hue update fixes annoying motion sensor glitch for your smart lights

The latest Philips Hue firmware update fixes a motion sensor bug, ensuring lights return to their last on-state. The fix applies to the Hue Bridge rather than the motion sensor hardware and includes ...