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Smoke sensors are akin to the smoke detectors that have been keeping us safe for years The only difference between these sensors and the round modules on every level of our homes (you do have one on every level of your home, don t you ) is that these sensors are connected to the security system control panel When smoke is detected, a message is sent to the control panel and the alarm is tripped
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A door/window magnetic contact is a two-piece unit, as shown in Figure 5-9, that consists of a reed switch and a magnet The reed switch is mounted to the wall, for instance, and the magnet is mounted to the door or window frame When the door or window is opened more than a couple inches, the contact is broken and a message sent to the control panel
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Figure 5-9
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Water sensors, like the one shown in Figure 5-10, sit on the floor and are used to detect the presence of water For example, you could place a water sensor next to your sump If the water sensor detects water coming over the top of your sump, it sends a message to the control panel indicating that there is trouble
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Figure 5-10
Water sensor
5
WaterCop, shown in Figure 5-11, is a specialized type of water sensor In this case, it is used to detect whether your washing machine is overflowing WaterCop is connected to the water pipes going into the washing machine and another sensor is located on the floor The presence of water on the floor not only triggers the sensor, but it causes the valve to shut off, stopping more water from flooding onto the floor
Figure 5-11
WaterCop water sensor (Photo courtesy Smarthomecom)
Temperature
Temperature sensors do just what their name suggests: they sense temperature You can install these sensors inside or outside These sensors aren t going to detect a burglar, but they can be important when you are trying to integrate certain behaviors of your Smart Home
Outdoor Infrared Beam Sensors
These sensors create an invisible fence around your yard A transmitter is positioned at each corner of your yard with a receiver positioned on another corner This creates an infrared boundary that, if the beam is broken, sends a signal to your control panel to take action Maybe you just have an exterior light set to activate, or maybe you are tired of the neighbor kids throwing beer cans in your
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yard, and you want the neighborhood to wake up the next time they do it Beam sensors are weatherproof, and even manage to maintain 99 percent of their functionality in crummy weather
Combination
Like the all-in-one devices we talked about in the last chapter for computer networking, security systems are able to combine two or more sensors into one unit For instance, Smarthome sells a combination PIR and glassbreak detector for US$6999 If either of the sensors is tripped, a message is sent to the control panel Combination sensors are good solutions if you want to add more functionality to your system but don t have any more zones available on your control panel
System Design
Now that you understand the more prevalent sensors and components of security systems, let s look at how you can connect all these components to make a security system to fit your needs First, we ll talk about evaluating what you need in your Smart Home, and then we ll cover overall system design 30 MINUTES
Evaluating Needs
Before heading off to the store and picking up a bag of sensors and some security cabling, it s a good idea to understand your needs This will help you when you do decide to go to the store you ll know what types of sensors you need and how many spools of cabling to pick up
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