Contactless Doorbell

1#include <Servo.h>  
2#define trigPin 3  
3#define echoPin 2  
4Servo  servo;  
5// int sound = 250; 
6int pos = 0;  
7int led = 5;
8void setup()  {  
9Serial.begin (9600);  
10pinMode(led, OUTPUT);
11pinMode(trigPin, OUTPUT);  
12pinMode(echoPin, INPUT);  
13servo.attach(4);  
14}  
15void loop() {  
16long  duration, distance; 
17 
18digitalWrite(trigPin, LOW);  
19delayMicroseconds(2);  
20digitalWrite(trigPin, HIGH);  
21delayMicroseconds(10);  
22digitalWrite(trigPin,  LOW);  
23duration = pulseIn(echoPin, HIGH);  
24distance = (duration/2) / 29.1;  
25if (distance < 10) {  
26Serial.println("the distance is less than 10");  
27for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
28    // in steps of 1 degree
29    servo.write(pos);  
30    digitalWrite(led,  HIGH);// tell servo to go to position in variable 'pos'
31    delay(5
32    );                       // waits 15ms for the servo to reach the position
33  }
34  for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
35    servo.write(pos); 
36    digitalWrite(led, LOW);// tell servo to go to position  in variable 'pos'
37    delay(5);                       // waits 15ms for the servo  to reach the position
38  } 
39}  
40else {  
41servo.write(0);  
42}  
43if  (distance > 60 || distance <= 0){  
44Serial.println("The distance is more than  60");  
45}  
46else {  
47Serial.print(distance);  
48Serial.println(" cm");  
49}  
50delay(500);  
51}     
52

1#include <Servo.h>  
2#define trigPin 3  
3#define echoPin 2  
4Servo
5  servo;  
6// int sound = 250; 
7int pos = 0;  
8int led = 5;
9void setup()
10  {  
11Serial.begin (9600);  
12pinMode(led, OUTPUT);
13pinMode(trigPin, OUTPUT);
14  
15pinMode(echoPin, INPUT);  
16servo.attach(4);  
17}  
18void loop() {  
19long
20  duration, distance; 
21 
22digitalWrite(trigPin, LOW);  
23delayMicroseconds(2);
24  
25digitalWrite(trigPin, HIGH);  
26delayMicroseconds(10);  
27digitalWrite(trigPin,
28  LOW);  
29duration = pulseIn(echoPin, HIGH);  
30distance = (duration/2) / 29.1;
31  
32if (distance < 10) {  
33Serial.println("the distance is less than 10");
34  
35for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
36
37    // in steps of 1 degree
38    servo.write(pos);  
39    digitalWrite(led,
40  HIGH);// tell servo to go to position in variable 'pos'
41    delay(5
42    );
43                       // waits 15ms for the servo to reach the position
44  }
45
46  for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
47
48    servo.write(pos); 
49    digitalWrite(led, LOW);// tell servo to go to position
50  in variable 'pos'
51    delay(5);                       // waits 15ms for the servo
52  to reach the position
53  } 
54}  
55else {  
56servo.write(0);  
57}  
58if
59  (distance > 60 || distance <= 0){  
60Serial.println("The distance is more than
61  60");  
62}  
63else {  
64Serial.print(distance);  
65Serial.println(" cm");
66  
67}  
68delay(500);  
69}     
70