Automated Rail Crossing System | Sheekar Banerjee

1//the code is entirely created by: SHEEKAR BANERJEE (at December 2017)
2//Dept.  of CSE, IUBAT
3//AI-ML-IOT Solution Engineer and Researcher
4
5
6#include<Servo.h>  //This calls the Header of the repository containing the library files of Servo  Motor Driver Modules
7#define trigPin 2  //This initializes the Trig pin of HC-05  Ultrasonic Sensor to the pin no. 2 of Arduino Microcontroller
8#define echoPin  3 //This initializes the Echo pin of HC-05 Ultrasonic Sensor to the pin no. 3 of  Arduino Microcontroller
9
10Servo sm;     //Servo is a Class which is providing  an independent data type // sm is a variable which is representing the servo motor
11
12int  sound=250;
13
14void setup() {
15 Serial.begin(9600); //Streaming 9600 bits of  sensor data per second
16 
17 pinMode(trigPin,OUTPUT); //Here, Trig pin triggers  the electrical impulses into the sensor as an output
18 
19 pinMode(echoPin,INPUT);  //Here, Echo pin inputs the reflective signals into the sensor
20 
21 sm.attach(9);   //Servo motor data pin is attached to Arduino Digital Pin 9 
22}
23
24void  loop() {
25  long duration, distance;
26  digitalWrite(trigPin, LOW);
27  delayMicroseconds(2);        // It will wait for 2 microseconds after every single electrical implulse  of Trig pin if it is sending LOW(less than 1.6V) signal
28  
29  digitalWrite(trigPin,  HIGH); 
30  delayMicroseconds(10);       //It will wait for 10 microseconds after  every single electrical implulse of Trig pin if it is sending HIGH(greater than  1.6V) signal
31  digitalWrite(trigPin, LOW);
32
33
34  duration=pulseIn(echoPin,  HIGH);  //Sensor inputs the signal through the Echo pin
35  distance=(duration/2)/29.1;       //Calculation of distance
36 
37 if(distance<10)    //According to the  reflection time calculation, if the distance is less than 10 cm  
38 {
39   sm.write(80);      
40 }
41 else { 
42   sm.write(0); //The Servo Motor will rotate for 80  degrees     
43} 
44}