The PIR (Passive Infrared) Sensor detects motion by sensing changes in infrared radiation from nearby objects. It is commonly used in security systems, lighting automation, and occupancy detection. The sensor is energy-efficient, easy to integrate, and responds quickly to movement, making it ideal for applications that require reliable motion detection.
PIR SENSOR
A PIR Sensor (Passive Infrared Sensor) is an electronic sensor that detects motion by measuring infrared (IR) radiation emitted by objects in its field of view. It is commonly used in motion detectors for security systems, automatic lighting systems, and other motion-sensing applications.
Key
Features of a PIR Sensor:
Passive Detection:
The PIR sensor does not emit any energy for detection;
it only detects the IR radiation emitted by surrounding objects, hence it
is called "passive."
Motion Detection:
The PIR sensor is primarily used for detecting motion
by sensing the infrared radiation changes in its environment caused by
moving objects, such as humans or animals.
Dual IR Elements:
Inside a PIR sensor, there are usually two slots made
of pyroelectric material. When a warm object (such as a person)
moves across the sensor’s field of view, the amount of IR radiation
striking the two slots changes, and this triggers a detection.
Field of View:
PIR sensors typically have a wide detection angle,
usually between 100° to 180° horizontally and 10 to 60 feet
in range, depending on the model and application.
Low Power Consumption:
PIR sensors consume very little power, making them
ideal for battery-operated devices.
PIR sensors typically operate at 3.3V to 5V,
Range:
Detection range can vary from 10 to 30 feet or more, depending
on the sensor and its configuration.
Delay Time: PIR sensors can have adjustable delay times for how
long they remain active after detecting motion, ranging from a few seconds to
several minutes.
Sensitivity Adjustment: Some PIR
sensors allow adjustment of sensitivity, affecting the detection range and how
sensitive the sensor is to small movements.
Applications:
Security Systems:
Automatic Lighting Systems:
Smart Home Devices:
SPECIFICATION
Detection range: up to 7 meters
Detection angle: 110 degrees
Operating voltage: DC 4.5V - 12V DC
Output signal: 3.3V digital output
Delay time: adjustable from 0.3 seconds to 5 minutes
