One of the most common uses for smart home tech is to make the lights in your home turn on and off. Smart bulbs are reasonably affordable and simple to install, and combined with switches, can make your lights easy to control. There are three other smart home sensors that can make your smart home even better.
Presence sensors
Don’t get left in the dark
One of the simplest home automations to set up involves combining a motion sensor and a smart bulb. You set up the bulb to turn on when motion is detected. When you walk into the room where the motion sensor is, the light will automatically turn on.
The problems start when you want the light to turn off again. It’s simple enough to create another automation that will turn off the light when motion is no longer detected. The light should turn off once you’ve left the room.
The trouble is that a motion sensor can only tell when something is moving in a room. If you sit still, the motion sensor no longer detects motion, the automation runs, and the lights turn off, leaving you sitting in the room in the dark.
An effective solution to this problem is to use a presence sensor. As the name suggests, a presence sensor detects your presence rather than simply detecting motion. Some mmWave presence sensors are sensitive enough to be able to detect the rise and fall of your chest as you breathe, so they can detect your presence even when you’re sitting still.
Using a presence sensor, your lights should stay on as long as you’re in the room, and only turn off when you leave. Some presence sensors also allow you to set up zones so that you can do things such as have a lamp turn on when someone sits down in a specific armchair.
- Compatibility
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ESP Home
- Weight
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40g
Featuring multi-target tracking, support for zones, light level sensing, Bluetooth proxy and support for multiple different mmWave sensors, the Lite offers next level features for a more pocket-friendly point.
Lux sensors
Your lights don’t always need to be on
Another problem with using a simple automation that turns on the light when motion is detected by a motion sensor is that it will work at any time, night or day. In the evening, when the room is dark, having the light turn on when you walk in is ideal. In the daytime, when the room is full of sunlight, turning on the light is unnecessary.
That’s where a lux sensor can help. A lux sensor measures light levels, and you can use this to ensure that your lights only turn on when it’s dark enough to warrant it. You can add a simple condition to your automation that will only turn the lights on when the light level is below a certain threshold.
A lux sensor is also very useful for making your lights turn on automatically. I have an automation in my home office that turns the lights on when the light level drops below a certain value. It still feels like magic each day when the light automatically turns on in the late afternoon as the light levels in my room start to drop. Combined with a presence-based automation, I haven’t had to touch the light switch in my home office for months; the light is always on when I need it and off when I don’t.
You can buy dedicated lux sensors, but many motion sensors and presence sensors include lux sensors in the device. You can then use the data from both sensors in combination to make your automations even more accurate.
They can do more than you realize
Contact sensors could be the most underrated sensors there are. The obvious uses for contact sensors are to determine whether a door or window is open or closed, and they’re excellent for that purpose. There’s so much more you can do with them, however.
A contact sensor on the door of a room can help to turn on your lights before you even enter the room. While a motion sensor in the room won’t be triggered until you cross the threshold, a contact sensor can turn your lights on as soon as the door to the room starts to open.
As well as your main doors, you can use them on the doors of cabinets or closets to make internal lights turn on. You can track when your front door is opened and closed to help determine when someone returns to or leaves the house, or have your heating or cooling temporarily pause if your windows are open.
A contact sensor on your mailbox can alert you when your mailbox has been opened, and a contact sensor on your attic hatch door can turn on the lights in the attic as soon as the hatch is opened. You can even stick the magnet from a contact sensor to the back of your controller and the other half to the charging dock. When you take your controller out of the dock, an automation can fire up the TV, power on your console, switch to the right TV input, and dim the lights so you’re ready to play.
5 wild smart home sensors you can integrate with Home Assistant
Great gifts for the smart home nerd in your life.
These sensors can make your smart home better
Some smart home automations can be frustrating and fail to work properly when you need them. These sensors can help to reduce these frustrations. They give you incredibly useful signals that can make your automations react when they’re supposed to and stop them from reacting when they’re not.





