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1Instructables1,239Views2CommentsSan Francisco Bay AreaJoined January 2nd, 2016

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  • Standalone Intelligent Sensor System

    We have thought about using SIS for security, but we have reservations about the cheap sensors. These sensors are, in fact, sold on E-Bay as part of a security system, but they do not broadcast a low battery conditions. We think that the low price is worth it if the application is monitoring Grandma to see if she is OK at home (but not emergency response!). If a sensor battery dies, you would see a change in Grandma's daily pattern that would consistently leave out some room, in which case you would be inclined to check on the sensor's battery (and Grandma!).Another reservation is that the separation sensors only trip when a door or window is opened. Most professional alarm systems keep track of door and window state so that you don't arm the alarm system with the back door or a win...see more »We have thought about using SIS for security, but we have reservations about the cheap sensors. These sensors are, in fact, sold on E-Bay as part of a security system, but they do not broadcast a low battery conditions. We think that the low price is worth it if the application is monitoring Grandma to see if she is OK at home (but not emergency response!). If a sensor battery dies, you would see a change in Grandma's daily pattern that would consistently leave out some room, in which case you would be inclined to check on the sensor's battery (and Grandma!).Another reservation is that the separation sensors only trip when a door or window is opened. Most professional alarm systems keep track of door and window state so that you don't arm the alarm system with the back door or a window left open and then a burgler enters the house without tripping the alarm. Likewise, in SIS we cannot tell if Grandma closed (and locked) her door when she left the house, but we do know that she went out and is not at home.

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