Big Dome PIR Motion Detection Sensor Module HC-SR501

The HC-SR501 PIR (Passive Infrared) Motion Sensor is a low-cost and widely used module for detecting motion. It detects changes in infrared radiation, typically caused by moving objects like humans or animals.

Technical Specifications

Power Supply: 5V to 12V DC
Output Voltage: 3.3V logic signal (high when motion is detected)
Detection Range: 3 to 7 meters (adjustable)
Delay Time: 5 seconds to 5 minutes (adjustable)
Trigger Modes: Single Trigger (default) and Repeat Trigger
Lens Angle: About 120 degrees

Pinouts:

Connection with Arduino:

Module	Arduino UNO
VCC	5V
GND	GND
OUT	Pin 2

Sample code:

const int pirPin = 2; // HC-SR501 output pin

void setup() {

pinMode(pirPin, INPUT); // PIR sensor as input

Serial.begin(9600); // Start serial communication

}

void loop() {

int motionDetected = digitalRead(pirPin); // Read PIR output

if (motionDetected == HIGH) {

Serial.println("Motion Detected!");

} else {

Serial.println("No motion Detected!");

}

delay(100); // Small delay to reduce noise

}

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