Published December 5, 2017 © GPL3+

PROXIMITY_ALARM

Proximity Alarm with increasingly faster beeping like 'SONAR Radar'.

BeginnerFull instructions provided1,274

Things used in this project

Hardware components

Arduino UNO

Ultrasonic Sensor - HC-SR04 (Generic)

Buzzer

LED (generic)

9V DC Battery Connector

9V DC Battery

Jumper wires (generic)

Software apps and online services

Arduino IDE

Story

Ultrasonic sensor HC-SR04 is one of the most easiest and helpful of all sensors. Various codes for this sensor are available online and beginners can use these codes, manipulate and modify them according to their project requirements.

INTRODUCTION

PROXIMITY_ALARM is my first Arduino project. It quite easy to make and can be used in a wide variety of applications including home security, obstacle avoiding robots,distance measurements etc.

For this project I have used Arduino Uno, but it can easily work with almost any Arduino board with slight modifications. Apart from this I have also used a piezoelectric buzzer to produce sound, some jumper wires, a LED for indication and a 9V DC battery for power.

One of the great advantage of this project is that it is cost effective. If you have Arduino and sensors, you don't have to spend money on anything. For project's main body, I have used an old plastic bottle and cut it according to my requirements, which both 'environment friendly' and 'innovative' - two ideas that will definitely fetch you good points in any developing competition, if you made such a project.

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HOW TO MAKE ?

Use the circuit diagram to make connections. Attach Arduino, piezoelectric buzzer to the bottle with nut-bolts. Make holes for adding Ultrasonic sensor and LED. Use electric tape to join wires (no soldering required!).

THE CODE

After making connections, upload the code (given below).

Just copy paste the code to your Arduino IDE and upload the code to Arduino Uno. The code does not uses any external libraries, so you don't have to download any thing!

WORKING

It works on principle of SONAR. As the object approaches near the sensor, the rate of beeping from buzzer increases, acting like a Radar. Also every time you power the Arduino, a tone is played, thus giving the feel of a cool starting music !

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If you have any queries or suggestions, please write them in the comment section below.

Code

PROXIMTY_ALARM_CODE

#define trigPin 13
#define echoPin 12
int buzz=8;
int b;
int led=7;
int a=2;
int count =15;
//int j;
//#define led 11
//#define led2 10

void setup() {
  Serial.begin (9600);
  
  pinMode(led,OUTPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  //pinMode(led, OUTPUT);
 // pinMode(led2, OUTPUT);
}

void loop() {

  for(int i=0;i<2;i++)
  { while(count>0)
     {tone(buzz,500*count,300);
      // j=(rand()%10);
       delay(count*10);
       count--;
     }
  }
  long duration, distance;
  digitalWrite(trigPin, LOW);  // Added this line
  delayMicroseconds(2); // Added this line
  digitalWrite(trigPin, HIGH);
//  delayMicroseconds(1000); - Removed this line
  delayMicroseconds(10); // Added this line
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;
 // if (distance < 4) {  // This is where the LED On/Off happens
 //   digitalWrite(led,HIGH); // When the Red condition is met, the Green LED should turn off
//  digitalWrite(led2,LOW);
//}
 // else {
   // digitalWrite(led,LOW);
    //digitalWrite(led2,HIGH);
 // }
  if (distance >= 300 || distance <= 0){
   // Serial.println("Out of range");
 }
  else {
    //Serial.write(distance);
    //Serial.println(" cm");
    b=distance/10;
 tone(buzz,10000,50);
 digitalWrite(led, HIGH);
 digitalWrite(led, LOW);

 delay(b*70);
  }
 // delay(500);
}

Credits

PIYUSH_K_SINGH

3 projects • 1 follower

PROXIMITY_ALARM

Things used in this project

Hardware components

Software apps and online services

Story

INTRODUCTION

HOW TO MAKE ?

THE CODE

WORKING

Schematics

PROXIMTY_ALARM_CIRCUIT

Code

PROXIMTY_ALARM_CODE

Credits

PIYUSH_K_SINGH

Comments

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PROXIMITY_ALARM

PROXIMITY_ALARM

Things used in this project

Hardware components

Software apps and online services

Story

INTRODUCTION

HOW TO MAKE ?

THE CODE

WORKING

Schematics

PROXIMTY_ALARM_CIRCUIT

Code

PROXIMTY_ALARM_CODE

Credits

PIYUSH_K_SINGH

Comments

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