Smart Car Barrier System Project Data

Components

Arduino uno 

Ultrasonic sensor 

Servo SG90

Jumper Wires

9V Battery with connector

Cardboard

Paper clips

Circuit Diagram

Code

#include <Servo.h>   //servo library

Servo servo;     

int trigPin = 5;    

int echoPin = 6;   

int servoPin = 7;

long duration, dist, average;   

long aver[3];   //array for average

void setup() {       

    Serial.begin(9600);

    servo.attach(servoPin);  

    pinMode(trigPin, OUTPUT);  

    pinMode(echoPin, INPUT);  

    servo.write(0);         //close cap on power on

    delay(100);

    servo.detach(); 

} 

void measure() {  

digitalWrite(trigPin, LOW);

delayMicroseconds(5);

digitalWrite(trigPin, HIGH);

delayMicroseconds(15);

digitalWrite(trigPin, LOW);

pinMode(echoPin, INPUT);

duration = pulseIn(echoPin, HIGH);

dist = (duration/2) / 29.1;    //obtain distance

}

void loop() { 

  for (int i=0;i<=2;i++) {   //average distance

    measure();               

   aver[i]=dist;            

    delay(10);              //delay between measurements

  }

 dist=(aver[0]+aver[1]+aver[2])/3;    

if ( dist<50 ) {

//Change distance as per your need

 servo.attach(servoPin);

  delay(1);

 servo.write(0);  

 delay(3000);       

 servo.write(150);    

 delay(1000);

 servo.detach();      

}

Serial.print(dist);

}

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