The CBSE Regional Science Exhibition 2019 was held at Bhavan’s B.P. Vidya Mandir, Nagpur on 29-30th November, 2019. Constructed by Vidyasagar Academy Akola.

Arduino railway crossing automatic gate system

/*
 * Railway crossing automatic gate system to avoid accidents
 * Emerald School, Akola
 * Date: 22.11.2019
 */

#include <Servo.h> 
Servo servo1,servo2; 

int const trigPin=10;
int const echoPin=9;
int buzzer=2;

/* 
int i;

void buzzpulse()
{
  for(i=0;i<10;i++)
  {
  digitalWrite(buzzer,HIGH);
  delay(150);
  digitalWrite(buzzer,LOW);
  delay(150);
  }
} 
*/

  void setup()
  {
    pinMode(trigPin,OUTPUT); 
    pinMode(echoPin,INPUT); 
    pinMode(buzzer,OUTPUT); 
    servo1.attach(3);
    servo2.attach(11);
  }

  void loop()
  {
    int duration,distance;
  
    digitalWrite(trigPin,HIGH); 
    delay(1);
  
    digitalWrite(trigPin,LOW);
  
    duration=pulseIn(echoPin,HIGH);
  
    distance=(duration/2)/29.1;
  
      if(distance<=6 && distance>=2) 
      {   
        servo1.write(180); // gate-1 close
        servo2.write(180); // gate-2 close
        digitalWrite(buzzer,HIGH);
        delay(3000);
      } 
        
      else 
      {
        servo1.write(0); // gate-1 open
        servo2.write(0); // gate-2 open
        digitalWrite(buzzer,LOW);
        delay(1000);
      }
  
  }