Infrared Human Body Motion Sensor(HC-SR501)

Infrared PIR Sensor, a Passive Infrared Sensor.

It detects objects within its range that emit infrared radiation.

It can detect the faint infrared radiation emitted by humans, and allows for adjustments in detection distance and delay time.

Specifications

Operating Voltage: 4.5V ~ 20V
Quiescent Current: 50uA
Detection Angle: 110 degrees
Delay Time: 3 seconds ~ 300 seconds
Detection Distance: 3m ~ 7m

Required Hardware

Infrared Human Body Motion Sensor
Arduino

Connection

The following is the circuit used in the example code.

If using the Infrared Human Body Motion Sensor by itself, an LED is not necessary.

Instead of an LED, other modules can be applied and utilized.

Human Detection Sensor	Resistor	LED	Arduino
VCC			5V
OUT			D7
GND		-	GND
	Connection	+
	Connection		D8

Example Code

This is an example that uses the Infrared Human Body Motion Sensor to light up an LED.

#define PIR 7     //Define motion sensor pin
#define LED 8     //Define LED pin for verification
int state = 0;     //Variable for storing state
void setup()
{
  pinMode(PIR, INPUT);
  pinMode(LED, OUTPUT);
  digitalWrite(LED, LOW);
}

void loop(){      //Code to light up the LED when motion is detected
//  state = digitalRead(PIR);
  if(digitalRead(PIR))
  {
    digitalWrite(LED, HIGH);
    delay(1000);
  }
  digitalWrite(LED,LOW);
}

Execution Result