Movement Detection Using PIR Sensor and Arduino

OBJECTIVE

The objective of this project is to detect human movement using a PIR sensor and Arduino to trigger a response such as lighting an LED .

MODULES REQUIRED

Arduino uno
Pir motion sensor
LED

SCHEMATIC DIAGRAM

SCHEMATIC CONNECTION

Connect pir :

Connect the +ve (vcc) of the pir sensor to the 5V pin on the Arduino .

Connect the D(signal)pin of the pir sensor to the D9 pin on the Arduino.

Connect the -ve (GND )pin of the pir sensor to the Gnd pin on the Arduino .

Connect led:

Connect the +ve pin of the led to the D8 pin on the Arduino.

Connect the -ve pin of the led to the GND pin on the Arduino

To begin your project, click this template link:

Simulate on Wokwi

ARDUINO CODE


int led = 8;
int pir = 9;
int state = LOW;
int val = 0;
void setup() {
pinMode(led, OUTPUT);
pinMode(pir, INPUT);
Serial.begin(9600);
}
void loop(){
val = digitalRead(pir);
if (val == HIGH) {
digitalWrite(led, HIGH);
delay(100);
if (state == LOW) {
Serial.println("Movement detected!");
state = HIGH;
}
}
else {
digitalWrite(led, LOW);
delay(200);

if (state == HIGH){
Serial.println("No movement!");
state = LOW;
    }
  }
}

INSTRUCTIONS

Assemble the circuit by connecting all components as shown in the schematic diagram.

On the left side of the screen, open sketch.ino and write your Arduino code.

After completing the circuit and writing the code, click the green Play button to start the simulation.

When the motion is detected, the LED will turn ON. The serial monitor shows movement activated. There is no motion detected; the LED turns OFF, the serial monitor shows no movement

WORKING PRINCIPLE

The PIR sensor detects motion and sends a signal to the Arduino, which turns ON the LED and displays "Movement Activated"; if no motion is detected, the LED turns OFF and "No Movement" is shown.

Project Link

for your reference.