Available Languages

Introduction 

In this tutorial we will show you how to use the PIR Motion Sensor with the Arduino UNO board. PIR sensors are used to detect motion from pets or human from about 6 meters away. 

​

So let's see how it works!

What you will need - Hardware


​For this tutorial you will need:

The Circuit

The connections are easy, see the image above with breadboard circuit schematic.
  • Vcc  pin to Arduino 5V Pin
  • GND   pin to Arduino GND
  • Out pin to Arduino 2 Pin

The code

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
/*
 * PIR sensor tester
 */
 
int inputPin = 2;               // choose the input pin (for PIR sensor)
int pirState = LOW;             // we start, assuming no motion detected
int val = 0;                    // variable for reading the pin status
 
void setup() {
  pinMode(inputPin, INPUT);     // declare sensor as input
  Serial.begin(9600);
}
 
void loop(){
  val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    if (pirState == LOW) {
      // we have just turned on
      Serial.println("Motion detected!");
      // We only want to print on the output change, not state
      pirState = HIGH;
    }
  } else {
    if (pirState == HIGH){
      // we have just turned of
      Serial.println("Motion ended!");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }
}
Download the code from here and open it with Arduino IDE.
pir_sensor.zip
File Size: 0 kb
File Type: zip
Download File
Serial Monitor

Well done!

You have successfully completed one more Arduino "How to use the PIR Motion Sensor "

I hope you liked this, let me know in the comments.

Search Engine

Licence 

Help us to grow up!