What The Window or Door Sensor, How They Work & 6 Unexpected Uses

Entrances and exits are the home’s weakest points-and also to a thief, a window or door sensor is sort of a big “WELCOME” sign. This is exactly why door sensors-also referred to as “entry sensors,” “window sensors,” or “contact sensors”- are the most widely used security alarm devices. The first electronic home alarm system was entirely comprised of door sensors-if somebody opened up a window or door, it triggered a large vibrating bell inside a central area of the home. Fortunately, technologies have improved since that time, and homeowners have to face several choices. Here’s all you need to learn about today’s door sensors: the way they work, cooking techniques, and the way to design the very best setup for your house.

So How Exactly Does A Door Sensor Work?

Just about all window and door sensors make use of a “reed switch” to find out whenever a protected area continues to be breached. Reed switches came to be in Bell Telephone Laboratories in 1936, and therefore are utilized in from pedal keyboards to laptops (ever question the way your computer knows to visit sleep whenever you close the lid? This is a reed switch working!). A reed switch includes a group of electrical connectors placed slightly apart. Whenever a magnetic field is positioned parallel towards the electrical connectors, it pulls them together, closing the circuit.

Door sensors get one reed switch and something magnet, developing a closed circuit. If a person opens an armed window or door, the magnet is pulled from the switch, which breaks the circuit and triggers a celebration. Based on your setup and just what mode the body is within, this may be a discreet text, a chime alert, or perhaps a full-blown alarm.


Since the technology in an entry sensor is really elegant, you can use it in many creative ways-particularly if you can program different responses for alarm occasions. Some security companies, for example SimpliSafe, allow people to decide whether a triggered sensor means a complete-on alarm response, a security response having a detailed event report delivered to your email or phone (a good Alert), or perhaps a private text or email, with no public alarm event (a Secret Alert). SimpliSafe calls their door sensors “entry sensors” because they may be used in a number of situations.

Here are a few ways to benefit from individuals features and obtain the most from your entry sensors.

– Doorbell: Your SimpliSafe entry sensor doubles like a doorbell: In case your product is off, it’ll still seem a chime if a person triggers a sensor. Fantastic way to know whenever your husband has finally introduced home dinner-or maybe your child has were able to open a window in the room.

– “Virtual Bouncer”:Entry sensors don’t merely repel the outdoors world – they are able to warn you about breaches in your home, too. Stick one around the entrance towards the game room or even the door towards the liquor cabinet. Rig up having a Secret Alert in order that it only informs you when the seal is damaged – so that you can crack lower on individuals rule-breakers.

– 24/7 Lifeguard: Have curious kids who always wish to open the swimming pool gate or have fun with the cleaning utility caddy? Install some entry sensors, and obtain immediate and detailed Smart Alerts sent right to your phone whenever you have to arrived at the save.

– Spy: Savvy SimpliSafe worker Ryan K. positioned his TV exactly where he wants it, stuck with an entry sensor, after which generate a Secret Alert. “Now we all know if anybody moves it,” he states. If only I’d done such like with my small-fridge attending college.

– Party Fails: Want guaranteed entertainment at the next house party? Put an entry sensor on the medicine cabinet inside your bathroom and generate a Secret Alert. You will get a text each time someone peeks, and you will finally know which of the buddies can’t control their curiosity.

– Protecting Your Outside Stuff: Entry sensors will also be ideal for protecting outside equipment that you simply can’t keep within your stronghold-an in-window ac, for instance. Stick half from the sensor in your Air conditioner and yet another around the windowsill, and anybody who attempts to nab it will likely be attributed. TIP: Although entry sensors are electronics and should not get wet, wrap one out of saran wrap or perhaps a plastic bag and it’ll still work all right.

Read more: Choosing The Best Security System and Home Alarm Services



1. Basically crack my window to allow inside a breeze while I am away, will my entry sensor set off?

For added versatility with window and door positioning, just use a second magnet. This way the entry sensor has two “safe” positions-say, “window closed” or “window open 6 inches”-and when it’s moved from either of individuals it’ll trigger a security.

2. Will my entry sensor use my unusual door/window?

Before deciding what type of door sensor to purchase, its smart to check on its technical specifications to make certain they fit where you need to place it. A SimpliSafe Entry Sensor’s flexible design ensures that it’ll use nearly any kind of window or door, including sliding doorways, double doorways, and swinging home windows. Get more information at specialized entry sensor installation tips. (For several situations-for example doorways with very deep frames-a motion sensor might have better protection.)

3. Must I install my entry sensors inside a certain direction?

SimpliSafe entry sensors work all right upside lower, sideways, diagonally-take your pick. As lengthy because the magnet is under 2 ” in the sensor, it does not matter the way the sensor lies.

4. Can there be anywhere I should not install an entry sensor?

Certain metals can, with time, modify the magnets inside the sensors. If you’re searching to place an entry sensor on the metal object, a skinny plastic buffer placed between your metal and also the sensor will make sure it remains unaffected.

5. Could an burglar disable my entry sensor together with his own magnet?

Although technically possible, this is extremely unlikely. “The thief would want an costly, effective magnet,” states SimpliSafe Customer Support Manager Ryan K., “and they might have to know in which the entry sensor is within the door. If a person would do this, it might be somebody that had recently been in your house and seen where situations are.” Even when a thief attempted, he’d likely trip the alarm along the way, because reed switches are extremely sensitive. As Deves, an expert security alarm servicer and SimpliSafe customer, highlights, “it’s very simple to disturb the reed switches and cause a security whenever you attempt to utilize a secondary magnet from outdoors-it always disturbs the magnetic field and results in a security.”

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