The Arduino social - distancing sensor

1int trigger_pin = 2;
2
3int echo_pin = 3;
4
5int buzzer_pin =  10; 
6
7int time;
8
9int distance; 
10
11
12
13
14void setup ( ) {
15
16        Serial.begin (9600); 
17
18        pinMode (trigger_pin, OUTPUT); 
19
20        pinMode (echo_pin, INPUT);
21
22        pinMode (buzzer_pin, OUTPUT);
23
24        pinMode(13, OUTPUT);
25
26
27
28}
29
30
31
32
33void loop ( ) {
34
35    digitalWrite (trigger_pin, HIGH);
36
37    delayMicroseconds (10);
38
39    digitalWrite (trigger_pin, LOW);
40
41    time = pulseIn (echo_pin, HIGH);
42
43    distance = (time * 0.034) / 2;
44
45    
46
47  if (distance <= 50) 
48
49        {
50
51
52        Serial.print (" Distance= ");              
53
54        Serial.println (distance);        
55
56        digitalWrite(13, HIGH);
57
58        delay (500);
59
60        }
61
62  else {
63\\
64
65        Serial.print  (" Distance= ");              
66
67        Serial.println (distance);        
68
69        digitalWrite(13, LOW);
70
71        delay (500);        
72
73  } 
74
75  }

1int trigger_pin = 2;
2
3int echo_pin = 3;
4
5int buzzer_pin =
6  10; 
7
8int time;
9
10int distance; 
11
12
13
14
15void setup ( ) {
16
17
18        Serial.begin (9600); 
19
20        pinMode (trigger_pin, OUTPUT); 
21
22
23        pinMode (echo_pin, INPUT);
24
25        pinMode (buzzer_pin, OUTPUT);
26
27
28        pinMode(13, OUTPUT);
29
30
31
32}
33
34
35
36
37void loop ( ) {
38
39
40    digitalWrite (trigger_pin, HIGH);
41
42    delayMicroseconds (10);
43
44
45    digitalWrite (trigger_pin, LOW);
46
47    time = pulseIn (echo_pin, HIGH);
48
49
50    distance = (time * 0.034) / 2;
51
52    
53
54  if (distance <= 50) 
55
56
57        {
58
59
60        Serial.print (" Distance= ");              
61
62
63        Serial.println (distance);        
64
65        digitalWrite(13, HIGH);
66
67
68        delay (500);
69
70        }
71
72  else {
73\\
74
75        Serial.print
76  (" Distance= ");              
77
78        Serial.println (distance);        
79
80
81        digitalWrite(13, LOW);
82
83        delay (500);        
84
85  } 
86
87
88  }