A motion sensor is a device that detects moving objects with an emphasis on detecting people. It is often used as the linchpin of your home security system, as it can be used to detect people who are in or around your home when they shouldn’t be. Essentially, the main purpose of a motion sensor is to alert home owners or alarm system operators to intruders. The main styles are active sensors and passive sensors. Active sensors emit energy to identify motion in the surrounding area such as sound waves, microwave radiation, or infrared light. Passive sensors, on the other hand, do not emit energy, and instead read changes in energy in the area.

Products Available

There are many different manufacturers of motion sensors. If you want the best of the best, you can’t go wrong with SadoTech Wireless PIR. While it is a bit expensive, it will cost you less than an entire home security system, and is doorbell activated. It operates at a range of over 500 feet and alerts you for several scenarios, including when a certain perimeter is breached, a door or window is opened, your mailbox is opened, or when someone approaches your driveway or door. Reviewers love its different chime volumes and choice of tone, and how easy it is to install. Aeon Labs also produces a popular model, which can be used both indoors and outdoors. It comes equipped with a motion sensor, but also detects changes in temperature, lighting, and humidity. Some reviewers complained about the initial set-up process-you need to update the AEON sensor driver before you can access the light, humidity, and temperature sensors-but overall praised its ease-of-use and battery life. If you are looking to save some money and only want a motion detector for interior use, try the PIR725 Motion Sensing Light Socket. It provides light when you enter a room and immediately turns off when you exit. This helps save you money because the light doesn’t get left on when no one is in the room, helping to cut costs on electricity bills. It senses movement in a 360 degree radius and is incredibly easy to install – all you have to do is screw the bulb into the fixture. The only downside is that it doesn’t come with a light sensor, meaning it still turns on during the day even if you don’t need the light.

Pros & Cons

Motion sensors provide an extra layer of security for your home. They can help detect if intruders or unwanted visitors are near your home, and are much more affordable than fancy alarm systems. They can also be used in your home to turn on lights when you enter a room. The light then turns off after you have left the room. This is perfect if you have children who may forget to turn lights off after they have left a room, and can help lower your electricity bill, saving you money.

Price Range

While not dirt cheap, motion sensors are certainly affordable, and are much cheaper than home alarm systems. The SadoTech Wireless PIR model, for example, costs around $50The Aeon Labs Aeotec Z-Wave Multi-Sensor also costs around $50. For an interior model, the First Alert PIR725 model is extremely affordable at only $20.