Different types of motion sensors
There are different types of motion sensors available on the market, and each type has its own set of benefits and drawbacks. The two most common types are PIR sensor (passive infrared) and IR (infrared) motion sensors.
Passive infrared sensor (Pir Sensor)
The PIR motion sensors sense motion and turn lights on or off when there is motion detected. It can also be used in conjunction with some smart features that work with the Phillip Hue bridge, such as turning all of your lights off once you leave the house or returning them to their original state if motion is no longer detected after a determined amount of time.
PIR motion sensors work by detecting body heat, so they can be used to detect motion in both dark and light environments. They are also relatively affordable and easy to install. However, they can be susceptible to false positives or even triggering a false alarm if there is a lot of movement in the environment (e.g., if there is a dog or cat running around).
IR Motion Sensors
IR motion sensors work by detecting changes in the surrounding environment, so they can be used to detect motion in both dark and light environments. Unlike PIR motion sensors, they are not susceptible to false positives. This is because IR motion sensors only turn on their motion detection when motion is detected, thus, eliminating any motion that has already happened. Also unlike PIR motion sensors, the motion sensor must be able to “see” the motion in order for it to be detected. This means that motion can be detected behind walls, but motion cannot be detected around corners.
The Microwave sensor uses microwave motion sensors to detect motion. However, this type of motion sensor can be susceptible to false positives because they are not very accurate when motion is detected. They are mainly used in industrial settings, such as warehouses or airports, for motion detection.
Accelerometer motion sensors
The motion sensor uses this type of motion sensor to detect motion in the form of vibrations. It can be attached to an object and turned on once it has been set up with a specific threshold value. For example, you can attach the motion sensor to a door and configure it to turn on if there is a vibration that is stronger than a specific number of decibels (dB).
Accelerometer motion sensors are very accurate because they detect motion in one direction rather than through heat waves. This makes them ideal for use with doors or windows and motion detection. However, they can be susceptible to false positives if there is a lot of movement in the environment.
Inertial motion sensors
The motion sensor uses this type of motion sensor to detect motion by using micro-electro-mechanical systems technology (MEMS).