Published April 12, 2021 © GPL3+

Ultrasonic security system

This is a distance sensitive alarm made with ultrasonic sensor

BeginnerShowcase (no instructions)8,387

Things used in this project

Hardware components

Ultrasonic Sensor - HC-SR04 (Generic)

Buzzer

Arduino UNO

Breadboard (generic)

Jumper wires (generic)

Story

Hello everyone,

This project is an ultrasonic based security alarm. It is distance sensitive, so the buzzer beeps faster if the object is near and it beeps slowly if the object is far.

I first mounted the buzzer and ultrasonic sensor on the breadboard. Take two wires from the Arduino one for 5V and the other of GND and connect it to the breadboard. Then I connected the ultrasonic sensor in the following manner-

Trig pin - pin 6 of Arduino

Echo pin - pin 5 of Arduino

GND - GND pin

And in the end I connected the positive terminal of the buzzer to pin 2 and negative terminal to GND. After all the breadboard connections were done I connected the USB cable. Upload the sketch and check the distance on the serial monitor.

Hope you guys like this project. Experiment with the value of the delay and try out what works best for you. Don't forget to have fun with your project

Code

Ultrasonic Security Alarm

//Security Alarm with Ultrasonic Sensor//

#define trigPin 6  
#define echoPin 5
#define buzzer 2
float new_delay; 


void setup() 
{
  Serial.begin (9600); 
  pinMode(trigPin, OUTPUT); 
  pinMode(echoPin, INPUT);
  pinMode(buzzer,OUTPUT);
  
}


void loop() 
{
  long duration, distance;
  digitalWrite(trigPin, LOW);        
  delayMicroseconds(2);              
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);           
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;
  new_delay= (distance *3) +30;
  Serial.print(distance);
  Serial.println("  cm");
  if (distance < 50)
  {
   digitalWrite(buzzer,HIGH);
   delay(new_delay);
   digitalWrite(buzzer,LOW);
 
  }
  else
  {
    digitalWrite(buzzer,LOW);

  }
  
 delay(200);
}

Credits

nimishac

3 projects • 2 followers

Ultrasonic security system

Things used in this project

Hardware components

Story

Schematics

Connections

Code

Ultrasonic Security Alarm

Credits

nimishac

Comments

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Ultrasonic security system

Ultrasonic security system

Things used in this project

Hardware components

Story

Schematics

Connections

Code

Ultrasonic Security Alarm

Credits

nimishac

Comments

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