Project V - 5. Anti Theft Alarm (Arduino Based)

Anti Theft Alarm

Ultrasonic sensors installed in the passage are roughly passed by people. Can be fenced or front door. If anyone passes, then it will cut the sensor measuring distance and detected as a thief. Alarm in the form of buzzer will be active. Set the position of the sensor with the distance between the sensor with the wall or a 2.5 m barrier.

Hardware Requirement

Ultrasonic Sensor HC-SR04
16 x 2 LCD Module
A Buzzer
Power supply +5 Volt
Jumper

Ultrasonic Sensor HC-SR04 | Source Buzzer | Source

Block Diagram

Schematics

Arduino - LCD Wiring

Arduino - Ultrasonic Sensor Wiring

Arduino - Buzzer

Source Code/Sketch

#define TRIGPIN 8
#define ECHOPIN 9
#include <LiquidCrystal.h>
LiquidCrystal lcd(2, 3, 4, 5,6,7);
unsigned int jarak, timer;
void setup(){
lcd.begin(16, 2);
lcd.print(" ALARM ");
lcd.setCursor(0, 1);
lcd.print(" ANTI MALING ");
delay(2000);
lcd.clear();
lcd.print("Kondisi=");
pinMode(ECHOPIN, INPUT);
pinMode(TRIGPIN, OUTPUT);
pinMode(11, OUTPUT);
}
void loop(){
digitalWrite(TRIGPIN, LOW);
delayMicroseconds(2);
digitalWrite(TRIGPIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIGPIN, LOW);
timer = pulseIn(ECHOPIN, HIGH);
jarak= timer/58;
if(jarak<200) {
lcd.setCursor(8, 0);
lcd.print("Bahaya");
while(1){
digitalWrite(11,1);
delay(50);
digitalWrite(11,0);
delay(50);
}
}
else{
lcd.setCursor(8, 0);
lcd.print("Aman");
delay(500);
}
}

How it Works

1. Connect the Arduino with Peripherals needed
2. Plug in the Power Source on the device
3. Compile and upload the script program above to your arduino
4. First initial LCD display

5. After 2 seconds the ultrasonic sensor instantly reads the distance and displays its condition, If the
distance between object with sensor is greater than 250 cm (distance> 250cm) then buzzer does
not ring and LCD shows "Condition = Secure".