Smart lights, thermostats and security cameras are the heart of the smart home, think of smart sensors as the eyes, ears & nose. Or, if you prefer, the way the house environment communicates.
Many of the sensors used in a smart home today are wireless and battery-powered, allowing you to place them wherever you like. But the position of these sensors is key. If you’re going DIY, think about the locations that are going to be most effective but least likely to cause issues if you’re using them for security. Say you’re using a motion sensor, you’ll want to put it in a place an intruder is most likely to pass by, but not somewhere where it’s triggered by daily visits from pets. There are many sensors out on the market designed to fulfill different purposes: motion sensors, door/window sensors, temperature sensors, and plenty more. And there’s a huge range of different methods for how these sensors work and how they transmit data; Zigbee, Bluetooth, Wi-Fi and a whole lot more. We will concentrate only on these three.
Zigbee is an IEEE 802.15.4-based protocol for a high-level communication used to create personal area networks with small, low-power digital RF, low-bandwidth needs, designed for small scale projects which need wireless connection. Hence, Zigbee is a low-power, low data rate, and close proximity (i.e., personal area) wireless ad hoc network.
Bluetooth is a wireless technology standard used for exchanging data between fixed and mobile devices over short distances using radio waves in the radio bands, from 2.402 GHz to 2.480 GHz, and building personal area networks.
WIFI is a family of wireless network protocols, based on the IEEE 802.11 family of standards, which are commonly used for LAN and Internet access.
Sensors play a critical part in a smart home. Without them the term smart in smart home is redundant because the home can not think on its own and has to always be told what to do. You can tell a dog the fetch the ball or the dog can see you throw the ball and react. Which kind of smart home do you want?