are popular when it comes to and are also energy efficient. You can connect them to a burglary alarm and a , which activate after the sensors detect motion in the vicinity. It’s a great way to save energy as the lights only go off when they sense motion and shut down soon after the trigger goes away.
There are three types of motion sensors and are all useful both in private homes and businesses. They can detect passersby with infrared rays and perform one or another action depending on how you program them.
Types of Motion Sensors
The most common types of sensors are passive infrared (PIR), microwave, and dual tech or hybrid. Let’s look at each one of them in more detail.
Passive Infrared Sensors
This , commonly known as PIR is the one you might’ve seen outside a restroom or an office space. They’re usually white and also small, low power, cheap, and easy to use. It senses movement through the changes in the temperature between a given background and a living body. This kind of sensor is known as pyroelectric and can detect levels of infrared radiation coming from anything that has some level of it. Most animals, including humans, emit a good amount of heat.
The two slots of the passive infrared sensors are made of a special material that’s sensitive to infrared energy. Thus, the sensor senses a differential change between the two slots and causes a pulse, and thus, detects “movement.”
The white plastic on this kind of is known as a Fresnel lens, which gives the PIR sensor a larger detection area so it’s more efficient. Read more