Contact sensors, often known as door or window sensors, use magnets to sense open or closed states. You can use this information and the changing of these states to do all sorts of neat things in your ...

It’s pricey and likely won’t work with an existing non-Hue security system, but the Philips Hue Secure contact sensor still ranks as one of the best door and window sensors we’ve tested. Signify-owned ...

Basic safety systems are typically hardwired as normally closed safety switches and sensors using two redundant circuits, which are monitored by a safety relay. Although this method has been used for ...