What Is PIR Motion Sensor And How Do They Work

Have you ever wondered how electrical systems and various security systems, such as CCTV cameras or certain types of lamps or light bulb, work and why they detect signals and help keep us safe? The answer is that these devices have technology called Motion Sensors, which are sensors designed to detect the movement of objects when they move within a specified area. Electronic devices labeled as having Motion Sensor technology are most often PIR (Passive Infrared) sensors. Simply put, they are sensors that detect infrared rays. How does this type of sensor work? We invite you to read this article!

How the PIR Motion Sensor works

Infrared: These are rays that cannot be seen but can be felt, so they are also called heat rays. For example, the heat felt from the sun is infrared or even humans emit infrared rays. Therefore, there is the application of infrared radiation in detectors for us to use.
PIR Sensor : An abbreviation for Passive Infrared Sensor. It is a device that detects infrared radiation that spreads from people or animals while moving to a device called Pyroelectric and converts heat energy into electrical energy. As a result, many brands of CCTV cameras and sensor lamps have widely applied PIR Motion Sensor technology.

Using the PIR Motion Sensor

A PIR Sensor with a Pyroelectric device, when it is installed in various electronic devices, can detect the heat of living things in that area or not. To send signals or send various commands according to the functionality of that device. For example:
- Lamps, lighting: When people walk past the PIR Motion Sensor, the sensor will automatically turn on the lights.
- CCTV cameras: Used for the home's security system when someone breaks in or passes by in an unwanted area. The sensor will immediately notify the homeowner.
- Use with pets: Whoever has pets in their homes, PIR Motion Sensor technology is also used in this section, such as an infrared detector that will detect the movement of dogs, cats, or pets within the house. Or a sensor lamp for lighting when dogs and cats eat food, etc.

In addition to the PIR Motion Sensor that detects infrared rays, other types of Motion Sensors also include Microwave, which is a sensor that detects the movement of objects that uses the principle of reflection of microwave waves. Nowadays, microwaves have been applied in many technologies, such as automatic doors in department stores. And Ultrasonic is a sensor that detects the movement of objects in order to calculate distance based on the principle of reflection of sound frequencies through the release of ultrasonic waves to hit objects and measure the reflection of the waves. Commonly used in industry, such as water level measuring devices, workpiece detection, object thickness detection in production, etc.

Benefits of Motion Sensors

Enhance the work of CCTV cameras: Nowadays, CCTV cameras have modern technology. Both accurately capture images and comfortably shoot in dark places. If there is a Motion Sensor, it will automatically turn on the spotlight when there is an intrusion, making it possible to capture more clear images.
Reduce energy consumption: For example, sensor lamps or street lamps illuminate if there are no people within the sensor's area at a given time. The sensor will automatically turn off the light, helping to save energy and electricity bills as well.
Increase Safety: Motion Sensors help increase safety and help notify homeowners of abnormalities. Such as sensor lamps that automatically turn on when there is abnormal movement in areas where no one is around. This will help people in the house be ready to deal with unexpected situations in a timely manner.

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