PIR sensor modules are one of the most popular electronic components used in today’s electronic projects.
PIR stands for “Passive Infrared”, and these sensors work by detecting infrared radiation emitted by objects in their field of view. When an object moves within the field of view, the PIR sensor detects the change in infrared radiation and triggers an output signal.
PIR sensor modules are commonly used in burglar alarms, security systems, and automatic lighting control applications. However, with a little creativity, they can be used for all sorts of interesting projects. In this article, we’ll explore some of the ways you can use PIR sensor modules in your next project.
Table of Contents
What is a PIR sensor module?
A PIR sensor module is a type of infrared sensor that is used to detect movement. PIR sensors are often used in security systems and can be found in many homes and businesses.
PIR sensor modules typically have three pins: power, ground, and signal. The power pin is used to supply power to the sensor, the ground pin is used to connect the sensor to ground, and the signal pin is used to output a signal when motion is detected.
Its applications
PIR sensors are most commonly used in security and burglar alarm systems, as well as automatic lighting control systems. PIR-based motion detectors are also used in some computer peripherals, such as gaming mice and keyboards.
Its working principle
When infrared radiation falls on the surface of the pyroelectric sensor, it generates a minute voltage across the element. This generated voltage is proportional to the incident radiation intensity. The output of Pyroelectric IR sensor mainly depends on three parameters:
- Frequency of incident radiation
- Area of exposed surface
- Temperature
Its features
PIR sensor module is an affordable and easy-to-use sensor that can detect the presence of an object. It can be used to detect the presence of a person, animal, or vehicle. PIR sensor module is often used in security systems and in motion-activated lighting.
How to use it?
PIR motion sensors are used to detect movement of people or animals. They are often used in security systems and can be found in homes, office buildings, and retail stores. PIR sensors can also be used to automatically turn lights on when someone enters a room, and to turn lights off when no one is present.
To use a PIR sensor module, first connect the power supply and ground wires to the appropriate terminals on the module. Then, connect the output wire to the input of the device that will be triggered by motion (such as an alarm system or a light switch). Finally, point the sensor in the desired direction and test it by moving around in front of it.
Advantages and disadvantages
PIR modules are used in a variety of applications, from automatic lighting controls to burglar alarms. PIR sensors are also relatively inexpensive and easy to find. However, there are some disadvantages to using PIR sensors.
One disadvantage is that PIR sensors can be triggered by any moving object, not just people. This means that false positives are possible. Another disadvantage is that PIR sensors only work in a limited range (usually around 15 feet). This means that they may not be suitable for all applications.
Conclusion
PIR sensor module is a low-cost infrared sensor used to detect the presence of human beings in an area. It is commonly used in burglar alarms and automatic lighting systems. PIR sensor module can be powered by either 3V or 5V power supply. It has three pins: ground, trigger, and output. The working principle of a PIR sensor is very simple. When there is no human movement in the detection range, the infrared receiver (the black component in the above image) does not receive any infrared radiation.