Obstacle avoiding robot

1#include <Servo.h>
2 
3Servo myservo;
4 
5int pos = 0;
6 
7void  setup()
8{
9  myservo.attach(9);
10}
11 
12void loop()
13{
14  for(pos  = 0; pos < 180; pos += 1)
15  {
16    myservo.write(pos);
17    delay(15);
18  }
19  for(pos = 180; pos>=1; pos-=1)
20  {
21    myservo.write(pos);
22    delay(15);
23  }
24}

1#include <Servo.h>
2 
3Servo myservo;
4 
5int pos = 0;
6 
7void
8  setup()
9{
10  myservo.attach(9);
11}
12 
13void loop()
14{
15  for(pos
16  = 0; pos < 180; pos += 1)
17  {
18    myservo.write(pos);
19    delay(15);
20
21  }
22  for(pos = 180; pos>=1; pos-=1)
23  {
24    myservo.write(pos);
25    delay(15);
26
27  }
28}

1#define echopin  8 // echo pin
2#define trigpin 9 // Trigger pin
3
4
5int  maximumRange = 30;
6long duration, distance;
7
8void setup() {
9  Serial.begin  (9600);
10  pinMode (trigpin, OUTPUT);
11  pinMode (echopin, INPUT );
12  pinMode  (4, OUTPUT);
13  pinMode (5, OUTPUT);
14  pinMode (13, OUTPUT);
15  pinMode (6,  OUTPUT);
16  pinMode (7, OUTPUT);
17}
18
19void loop ()
20{
21
22  {
23    digitalWrite(trigpin,LOW);
24    delayMicroseconds(2);
25    
26    digitalWrite(trigpin,HIGH);
27    delayMicroseconds(10);
28    
29    duration=pulseIn (echopin,HIGH);
30    
31    distance= duration/58.2;
32    delay (50);
33    Serial.println(distance);
34  }
35  
36  if (distance >= 30 ){
37    digitalWrite(4,HIGH);
38    digitalWrite(5,HIGH);
39    digitalWrite(6,LOW);
40    digitalWrite(7,LOW);
41    delay (200);
42  }
43  
44  else if (distance >=15 && distance <= 25) {
45    digitalWrite (4,HIGH);
46    digitalWrite (5,LOW);
47    digitalWrite (6,LOW);
48    digitalWrite (7,LOW);
49    delay (1000);
50  }
51 else if (distance < 15){
52   digitalWrite (4, LOW);
53   digitalWrite (5, LOW);
54   digitalWrite (6,HIGH);
55   digitalWrite (7,HIGH);
56   delay (1000);
57   digitalWrite (4,LOW);
58   digitalWrite (5,HIGH);
59   digitalWrite  (6,LOW);
60   digitalWrite (7, LOW);
61   delay (1000);
62   
63     
64 }
65
66}
67