PIR Sensor
Principle
The PIR Sensor (Passive Infrared Radiation Sensor) is an electronic component based on the NS612 pyroelectric digital intelligent sensor. It is capable of detecting infrared radiation emitted by moving infrared sources (such as the human body), thereby sensing the presence of the infrared source.
Specifications
Item |
Description |
|---|---|
Name |
PIR Sensor |
Code |
B0020028 |
Dimensions |
28×24×12 mm |
Voltage |
5V－DC |
Data Type |
Analog Signal |
Data Range |
0 or 1 |
Ports |
Grove |
Usage
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|---|---|---|
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Side View |
Front View |
Side View |
PIR Sensor Connection Diagram |
The PIR sensor can connect to the I²C interface of the micro:bit hub. In the coding environment, the sensor values can be read:
When the sensor detects a moving infrared source, the blue LED indicator lights up and outputs a signal value of 0.
If no moving infrared source is detected, the blue LED turns off and outputs a signal value of 1.
The PIR sensor is equipped with a linear potentiometer located on the back for fine sensitivity adjustments:
Rotate the potentiometer clockwise to increase sensitivity and extend the detection range.
Rotate it counterclockwise to decrease sensitivity and shorten the detection range.
Modular Coding
In the MakeCode coding software, by adding the micro:bit extension, you can code the system to read the PIR sensor signal from the P0 port and visualize the data on the micro:bit’s LED display.