Product Introduction #
Human infrared sensor is used to detect the infrared radiation emitted by the human or animal body module, when someone or other hot objects enter the sensor’s sensing range, the object will cause changes in the infrared radiation.
Its characteristic is that only when the external radiation causes its own temperature to change, it gives a corresponding electrical signal, when the temperature change tends to be stable, there will be no signal output, so it is only sensitive to the moving human body.
Application reference: human body sensor light, automatic door, automatic faucet, automatic stair lighting, etc.
Parameter Specification #
| Parameters | Value/Description |
| Operating voltage | 3.3V~5V |
| Operating temperature | -20°C~+85°C |
| Detection Angle | 100° |
| Detection range | 0~4m |
| Size | 3.16cm*2.38cm |
Wiring Diagram #
Note：Expansion board is attached to esp32 controller board.
| PIR Motion Sensor | ESP32 |
| VCC | 5V |
| GND | GND |
| Sign | Pin 32 |
Sample Code #
| void setup() {
pinMode(32,INPUT);//Set pin 32 to input mode Serial.begin(115200);//Set baud rate to 115200 } void loop() { Serial.println(digitalRead(32));//Read the state of pin 32 and print it to the serial monitor delay(1000); } |
Note: If you are using an Arduino board, then change the pin in the program to PIN7, set the baud rate to 9600, and then connect the hardware pin to PIN7 and upload the program.
Test Result #
After uploading the code to the controller board, open the serial port monitor of the Arduino IDE, set the baud rate to 115200, and switch to scroll mode.
When we move, the sensor returns data 1; When we are at rest, the sensor returns data 0.
Note: The module comes with a delay effect, so when the object is at rest, it will not send 0 data immediately, and it will wait for a period of time. If the serial port cannot display data normally, check whether the hardware connection interface is the same as the code interface.
Related Resources #
Get One Now #
B2B Business: info@acebott.com
Official Website: PIR Motion Sensor
