Ultrasonic security system

This is a distance sensitive alarm made with ultrasonic sensor

Apr 11, 2021

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46483 views

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8 respects

Components and supplies

Arduino UNO

Jumper wires (generic)

Buzzer

Breadboard (generic)

Ultrasonic Sensor - HC-SR04 (Generic)

Project description

Code

Ultrasonic Security Alarm

c_cpp

1//Security Alarm with Ultrasonic Sensor//
2
3#define trigPin 6  
4#define   echoPin 5
5#define buzzer 2
6float new_delay; 
7
8
9void setup() 
10{
11   Serial.begin (9600); 
12  pinMode(trigPin, OUTPUT); 
13  pinMode(echoPin, INPUT);
14   pinMode(buzzer,OUTPUT);
15  
16}
17
18
19void loop() 
20{
21  long duration,   distance;
22  digitalWrite(trigPin, LOW);        
23  delayMicroseconds(2);              
24   digitalWrite(trigPin, HIGH);
25  delayMicroseconds(10);           
26  digitalWrite(trigPin,   LOW);
27  duration = pulseIn(echoPin, HIGH);
28  distance = (duration/2) / 29.1;
29   new_delay= (distance *3) +30;
30  Serial.print(distance);
31  Serial.println("   cm");
32  if (distance < 50)
33  {
34   digitalWrite(buzzer,HIGH);
35   delay(new_delay);
36    digitalWrite(buzzer,LOW);
37 
38  }
39  else
40  {
41    digitalWrite(buzzer,LOW);
42
43   }
44  
45 delay(200);
46}
47

//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);
}

Ultrasonic Security Alarm

c_cpp

1//Security Alarm with Ultrasonic Sensor//
2
3#define trigPin 6  
4#define  echoPin 5
5#define buzzer 2
6float new_delay; 
7
8
9void setup() 
10{
11  Serial.begin (9600); 
12  pinMode(trigPin, OUTPUT); 
13  pinMode(echoPin, INPUT);
14  pinMode(buzzer,OUTPUT);
15  
16}
17
18
19void loop() 
20{
21  long duration,  distance;
22  digitalWrite(trigPin, LOW);        
23  delayMicroseconds(2);              
24  digitalWrite(trigPin, HIGH);
25  delayMicroseconds(10);           
26  digitalWrite(trigPin,  LOW);
27  duration = pulseIn(echoPin, HIGH);
28  distance = (duration/2) / 29.1;
29  new_delay= (distance *3) +30;
30  Serial.print(distance);
31  Serial.println("  cm");
32  if (distance < 50)
33  {
34   digitalWrite(buzzer,HIGH);
35   delay(new_delay);
36   digitalWrite(buzzer,LOW);
37 
38  }
39  else
40  {
41    digitalWrite(buzzer,LOW);
42
43  }
44  
45 delay(200);
46}
47

//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);
}

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