Guide to motion sensors and detectors for lighting

When it comes to motion detection, there are two main types: Microwave Sensors and Passive Infrared Motion Detectors. Both have their own benefits and drawbacks, so which one is right for you? In this blog post, we will discuss the difference between Microwave Sensors vs. Passive Infrared Motion Detectors, so you can make the best decision for your specific needs.

Topics that we will be covering:

  • How does motion sensor work and what are they used for?
  • What are the different type of sensors and how do they work?


Motion detection is a vital part of home security. When sensors detect motion, they send an alert to your control panel which then notifies the monitoring center and possibly records any events taking place at that time with camera surveillance equipment you may have in place as well!

Motion sensors are commonly used to:

  • When an intruder approaches your property or business, you may be able to spot him by monitoring your audio and video surveillance feeds.
  • People may enter restricted locations, so you’ll be alerted if they do. This might be the basement or the garage at home.
  • Save energy by powering lights in an area only when needed.


The two most widely used Motion Detectors are Microwave Sensors (MW) and Passive Infrared (PIR).

Microwave Sensor

What are Microwave Sensors? Microwave Sensors (MW) are devices used to detect and measure the presence of motion in a given area. They work by emitting microwaves into a space and then measuring the reflected signal. If there is any movement in the area, it will cause the reflected signal to change, which can be then be detected and measured.

Microwave sensors are an excellent choice for tracking moving objects, as they send out microwaves and measure reflections off of them. Microwave technology can cover a large area with little power while infrared trackers need more juice to work properly which makes it vulnerable in crowded areas or places subject on electric interference like laptop chargers nearby appliances where metal gets into its signal.

Passive Infrared Sensors (PIR)

What are Passive Infrared Sensors? Passive Infrared Sensors, or PIR sensors, are devices that detect infrared radiation. They are often used in security systems to detect movement. PIR sensors work by detecting the heat emitted by objects, which is why they are often called “heat-sensitive.”. When an object moves in front of the sensor, it interrupts the flow of infrared radiation and causes the sensor to activate.

A passive infrared sensor is the most widely used motion detector in home security systems. Infrared waves can detect temperature and motion sensors use this ability to sense if someone or something has passed by in their path which will then trigger an alarm for you when it happens; there’s even two different types within each camera – one detects ambient IR radiating from background objects like walls while another does not unless triggered by movement alone!

PIR sensors work by detecting the change in temperature that occurs when an object moves into or out of its field of view. This change in temperature is caused by the infrared radiation that is emitted by the object.

Passive Infrared Sensors are very reliable when used in low or moderate temperature environments. However, they can fail in high temperature environments.


Security systems with motion sensors aren’t just about having more bells and whistles; they’re a must-have. They are not only an additional feature of a security system, but they’re also absolutely necessary. There would be no way to detect intruders without sensors.

Hopefully, our article clarified the function of motion sensors in your house’s security, the various technologies used in motion detection, and how to choose the best one, we are here to be guide.