PIR Sensor

Z2M Part: EMS-00013-A

Detect motion using PIR sensor.

Circuit Diagram

Wire Connections & Pin Configuration

Wire Color Connections:

Yellow → Pin 2 to PIR OUT, Pin 12 to LED
Red → 5V to PIR VCC
Black → GND to PIR, LED cathode

Pin Configuration:

Arduino Digital Pin 2 → PIR sensor OUT
Arduino Digital Pin 12 → LED anode (via 220Ω resistor)
Arduino 5V → PIR sensor VCC
Arduino GND → PIR sensor GND, LED cathode

Arduino Code

Edit

int sensorinput = 2;   // PIR sensor connected to digital pin 2
int ledoutput = 12;    // LED connected to digital pin 12

void setup() {
  pinMode(ledoutput, OUTPUT);  // Set LED pin as output
  pinMode(sensorinput, INPUT); // Set sensor pin as input
  Serial.begin(9600);          // Initialize Serial Monitor
}

void loop() {
  int value = digitalRead(sensorinput);  // Read PIR sensor output
  Serial.println(value);                 // Print sensor reading for debugging

  if (value == HIGH) {                   // If motion detected
    digitalWrite(ledoutput, HIGH);       // Turn ON LED
    delay(100);                          // Short delay for visibility
  } else {
    digitalWrite(ledoutput, LOW);        // Turn OFF LED
  }
}

Instruction Details

Wiring: Connect PIR sensor VCC to 5V, GND to GND, OUT to Digital Pin 2. Connect LED anode to Digital Pin 12 via 220Ω, cathode to GND.
Library: Not required (built-in).
Upload Code: Tools → Board → Arduino Uno. Tools → Port → select your COM port. Click Upload button.
View Output: LED turns ON when motion detected. Open Serial Monitor at 9600 baud to see values. Adjust sensitivity/delay potentiometers on module.

How to Use

Connect the required components as per the Pin Configuration above
Open Arduino IDE and create a new sketch
Copy and paste the code above
Select your Arduino board and COM port from Tools menu
Click the Upload button to upload the code to your Arduino
Open Serial Monitor (if applicable) to see the output

Components Required

Arduino Uno
PIR Motion Sensor Module (HC-SR501)
LED
220Ω Resistor
Breadboard
Jumper Wires

Category: Sensors