How to Tell If a Door Has Been Opened (The Reliable Way)

If you are wondering how to tell if a door has been opened, for any door or window, I have the answer for you.

By installing smart sensors, it provides you with a very reliable and precise method to know immediately when it happens.

How to tell if a door has been opened

open door illustration and how to tell if a door has been opened

When a sensor has been triggered, a notification will be directly sent to your mobile device.

A log will also be made with a date and time stamp, so you know exactly when it was opened. So you can look back at any time later and look at all the triggered events.

So you could be anywhere in the world, and know exactly when something has been opened.

You can easily integrate these sensors with an alarm system, so if they are triggered, your alarm goes off instantly.

What else could smart sensors be used for?

outdoor shed

The reason I use these kinds of products is to simply trigger other smart devices when a something has been opened.

For example, when my front door opens during certain hours, I like my living room lights to turn on. It helps me not only see where I’m going, but it also provides me with a sense of surety knowing that I will always have my lights come on anytime I walk in the front door after 6 pm and before 7 am.

If you don’t have a smart garage door opener, you can use it to tell whether or not, you have left your garage open after driving away from your house.

The same thing can apply for other doors and windows. Knowing that everything is shut, is one less worry in the back of your mind throughout your day.

It’s really easy to check that everything is closed before you leave your home. It will save you from having to go around your entire home to make sure all the windows have been shut.

But this can also be useful for your garden shed. It’s annoying if it was left open and it was raining. This is a way to eliminate that annoyance from ever happening again.

How do wireless smart sensors work?

A sensor usually comes with two small components that attach to a frame and door or window.

Each one is usually constructed with plastic housing, sometimes has mounting holes for screws. Some of them require you to stick it in the desired location, using the two-way tape they provided.

A magnet is usually used in the smaller of the two sensor components. This magnetic field is detected by the other larger sensor piece.

When the two small sensors come into close proximity with each other, the door or window is considered to be closed. When they are past a certain distance from each other, they are considered to be open.

The larger of the two sensor components is the half that has all of the electronics, battery and WiFi capability.

It reports when it has been triggered, so you can have a detailed log or immediate alert, as to when the anything was opened.

How much do they cost?

wallet with bills

You could purchase a complete kit, with multiple sensors and some surveillance products bundled with it, or you could buy single set.

If you are planning to buy sensors only, it is relatively inexpensive and will only cost around $20 – $30. This is a perfect way to keep things within your budget, by purchasing one or more whenever you can. You can eventually have all your doors and windows completely fitted out.

A kit would most commonly cost anywhere between $70 – $300. Kits come with a variety of extras. Some include motion sensors, but this is all up to your vision of what you want to achieve.

Conclusive thoughts

So there is no need to try an employ various techniques that don’t let you know straight away when anything has been opened.

Having the event logs is very handy. One usage is to check whether the kids have come home at the right time, after school. Maybe the same method can be applied for your cleaner etc.

This method, in my opinion, is the most sensible solution on how to tell if a door has been opened.