Switching relay with Ultrasonic sensor

1const int trigPin = 2;
2const int echoPin = 3;
3const int relay =   10;
4long duration;
5int distance;
6int safetyDistance;
7
8void setup()   {
9  // put your setup code here, to run once:
10pinMode(trigPin, OUTPUT); //   Sets the trigPin as an Output
11pinMode(echoPin, INPUT);
12pinMode(relay, OUTPUT);//   Sets the echoPin as an Input
13Serial.begin(9600); // Starts the serial communication
14}
15
16void   loop() {
17  // put your main code here, to run repeatedly:
18
19
20// Sets   the trigPin on HIGH state for 10 micro seconds
21digitalWrite(trigPin, LOW);
22delayMicroseconds(2);
23
24digitalWrite(trigPin,   HIGH);
25delayMicroseconds(10);
26
27digitalWrite(trigPin,LOW);
28
29// Reads   the echoPin, returns the sound wave travel time in microseconds
30duration = pulseIn(echoPin,HIGH);
31//   Calculating the distance
32distance= duration*0.034/2;
33Serial.println(distance);
34delay(50);
35safetyDistance   = distance;
36if((distance>=25))
37  {
38    digitalWrite(relay, LOW);
39}
40    else if(distance<25)
41 {
42     digitalWrite(relay, HIGH);
43   }
44}
45

1const int trigPin = 2;
2const int echoPin = 3;
3const int relay =
4  10;
5long duration;
6int distance;
7int safetyDistance;
8
9void setup()
10  {
11  // put your setup code here, to run once:
12pinMode(trigPin, OUTPUT); //
13  Sets the trigPin as an Output
14pinMode(echoPin, INPUT);
15pinMode(relay, OUTPUT);//
16  Sets the echoPin as an Input
17Serial.begin(9600); // Starts the serial communication
18}
19
20void
21  loop() {
22  // put your main code here, to run repeatedly:
23
24
25// Sets
26  the trigPin on HIGH state for 10 micro seconds
27digitalWrite(trigPin, LOW);
28delayMicroseconds(2);
29
30digitalWrite(trigPin,
31  HIGH);
32delayMicroseconds(10);
33
34digitalWrite(trigPin,LOW);
35
36// Reads
37  the echoPin, returns the sound wave travel time in microseconds
38duration = pulseIn(echoPin,HIGH);
39//
40  Calculating the distance
41distance= duration*0.034/2;
42Serial.println(distance);
43delay(50);
44safetyDistance
45  = distance;
46if((distance>=25))
47  {
48    digitalWrite(relay, LOW);
49}
50
51   else if(distance<25)
52 {
53     digitalWrite(relay, HIGH);
54   }
55}
56

1const int trigPin = 2;
2const int echoPin = 3;
3const int relay =  10;
4long duration;
5int distance;
6int safetyDistance;
7
8void setup()  {
9  // put your setup code here, to run once:
10pinMode(trigPin, OUTPUT); //  Sets the trigPin as an Output
11pinMode(echoPin, INPUT);
12pinMode(relay, OUTPUT);//  Sets the echoPin as an Input
13Serial.begin(9600); // Starts the serial communication
14}
15
16void  loop() {
17  // put your main code here, to run repeatedly:
18
19
20// Sets  the trigPin on HIGH state for 10 micro seconds
21digitalWrite(trigPin, LOW);
22delayMicroseconds(2);
23
24digitalWrite(trigPin,  HIGH);
25delayMicroseconds(10);
26
27digitalWrite(trigPin,LOW);
28
29// Reads  the echoPin, returns the sound wave travel time in microseconds
30duration = pulseIn(echoPin,HIGH);
31//  Calculating the distance
32distance= duration*0.034/2;
33Serial.println(distance);
34delay(50);
35safetyDistance  = distance;
36if((distance>=25))
37  {
38    digitalWrite(relay, LOW);
39}
40   else if(distance<25)
41 {
42     digitalWrite(relay, HIGH);
43   }
44}
45