This document describes a motion detection alarm system using an Arduino board, PIR motion sensor, and buzzer. It discusses connecting the sensors to the Arduino, implementing the logic in code to check for motion and activate the buzzer, and how the system works by detecting motion and triggering the buzzer until motion stops. The purpose is to detect movement and activate an audible alarm using a simple circuit and code.

1. Motion Detection
Using Arduino
By Ahmad Reshd & Sajad Ali

2. TABLE OF CONTENTS
01
03
02
04
INTRODUCTION Hardware Connection
How To Connect The
sensors.
Software
Implementation
Operation
What is The purpose of This
Project.
Implementation of the
Logic To Code.
How it Works.

3. INTRODUCTION
01
What is The purpose of This Project.

4. What is The purpose of
This Project.
The project is a motion-activated alarm system
using an Arduino board, a PIR (Passive Infrared)
motion sensor, and a buzzer. The purpose of the
project is to detect any movement within the
sensor's range and activate an alarm in the
form of a buzzer.

5. Hardware
Connections
02
How To Connect The sensors.

6. Hardware Connections
The PIR motion sensor is connected to a digital pin on the Arduino
board. In this project, it is connected to digital pin 2.
The buzzer is connected to another digital pin on the Arduino
board. In this project, it is connected to digital pin 3.

7. Hardware Connections
The PIR motion sensor is connected to a digital pin on the Arduino
board. In this project, it is connected to digital pin 2.
The buzzer is connected to another digital pin on the Arduino
board. In this project, it is connected to digital pin 3.

8. Software
Implementation
03
Implementation of the Logic To Code.

9. Software Implementation
The Arduino code sets up the necessary configurations in the
setup() function.
In the loop() function, it continuously checks for motion detected
by the PIR sensor.
If motion is detected, the buzzer is activated, producing a sound.
When no motion is detected, the buzzer remains silent.

10. Code…
#include <Adafruit_Sensor.h>
#include <Wire.h>
#include <Adafruit_MLX90614.h>
// Constants
#define PIR_PIN 2 // PIR motion sensor pin
#define BUZZER_PIN 3 // Buzzer pin
#define LED_PIN 4 // LED pin
// Variables
int pirState = LOW; // PIR sensor state
int alarmState = LOW; // Alarm state

11. Code…
// Initialize PIR motion sensor
int calibrationTime = 30;
long unsigned int lowIn;
long unsigned int pause = 5000;
boolean lockLow = true;
boolean takeLowTime;
int calibrationDelay = 5000;
// Initialize buzzer
const int buzzerFrequency = 2000; // Buzzer frequency in Hz
const int buzzerDuration = 2000; // Buzzer duration in milliseconds

12. Code…(void setup() )
void setup() {
// Initialize serial communication
Serial.begin(9600);
// Set pin modes
pinMode(PIR_PIN, INPUT);
pinMode(BUZZER_PIN, OUTPUT);
pinMode(LED_PIN, OUTPUT);
// Calibrate PIR motion sensor
digitalWrite(PIR_PIN, LOW);
delay(calibrationDelay);
lowIn = digitalRead(PIR_PIN);
delay(calibrationTime);

13. Code…(void setup())
// Initialize the buzzer
tone(BUZZER_PIN, buzzerFrequency);
delay(buzzerDuration);
noTone(BUZZER_PIN);
// Print initialization message
Serial.println("Motion Detection Alarm System Initialized");
Serial.println("----------------------------------------");
}

14. Code…(void loop())
// Read PIR motion sensor state
int pirReading = digitalRead(PIR_PIN);
if (pirReading == HIGH && pirState == LOW) {
// Motion detected
pirState = HIGH;
alarmState = HIGH;

15. Code…(void loop())
// Activate alarm
digitalWrite(LED_PIN, HIGH);
tone(BUZZER_PIN, buzzerFrequency);
Serial.println("Motion Detected! Alarm Activated");
Serial.println("----------------------------------------");
} else if (pirReading == LOW && pirState == HIGH) {
// Motion stopped
pirState = LOW;
alarmState = LOW;

16. Code…(void loop())
// Deactivate alarm
digitalWrite(LED_PIN, LOW);
noTone(BUZZER_PIN);
Serial.println("Motion Stopped! Alarm Deactivated");
Serial.println("----------------------------------------");
}
if (alarmState == HIGH) {
// Print alarm status
Serial.println("Alarm is active");
} else {
// Print alarm status
Serial.println("Alarm is inactive");
}
delay(100);
}

17. Operation
04
How The Project Works.

18. Operation
When the PIR sensor detects motion, it sends a
signal to the Arduino board.
The Arduino board receives the signal and
triggers the buzzer to produce sound.
The buzzer continues to produce sound until the
motion is no longer detected.
Once the motion is no longer detected, the
buzzer stops producing sound.

19. Continue…
This project can be used as a simple security system to detect
unauthorized movement in a specific area. It can be placed in a
room, hallway, or any other location where motion detection is
desired. The buzzer serves as an audible alert to draw attention to
the detected motion.

20. THANKS!
DO YOU HAVE ANY QUESTIONS?
Reshad@goldenlight.Af
AhmadSajad@gmail.com