Automatic page turning machine

1// this coding provided by technical romboz 
2// tutorial video https://www.youtube.com/watch?v=53ykX3utPtw&t=28s
3
4#include  <Servo.h>
5#define echoPin 14
6#define trigPin 12
7#define motor 2 // relay  pin to operate motor 
8Servo myservo;  // create servo object to control a servo
9
10long  duration;
11int distance;
12void setup()
13{
14  Serial.begin(9600);
15  pinMode(trigPin,OUTPUT);
16  pinMode(echoPin,INPUT);
17  pinMode(motor,OUTPUT);
18  myservo.attach(5,500,2500);  // attaches the servo on pin 9 to the servo object
19
20}
21void loop()
22{
23  digitalWrite(trigPin,LOW);
24  delayMicroseconds(2);
25  digitalWrite(trigPin,HIGH);
26  delayMicroseconds(10);
27  digitalWrite(trigPin,LOW);
28  duration=pulseIn(echoPin,HIGH);
29  distance=(duration*0.034/2);
30  Serial.print("Distance : ");
31  Serial.print(distance);
32  Serial.println(" cm ");
33  delay(100);
34  
35  if (distance <=50)
36  {
37    digitalWrite(motor,LOW);
38    delay(1000);
39    myservo.write(180);  
40    delay(2000);
41    digitalWrite(motor,HIGH);
42    delay(1500);
43    myservo.write(0);  
44    delay(1000);          
45  }
46
47  else
48   digitalWrite(motor,HIGH);  
49}
50