Touchless Hand Sanitizer using HC SR04

1 
2#include <Servo.h>
3
4const int trigPin = 7; // Trigger Pin of   Ultrasonic Sensor
5const int echoPin = 6; // Echo Pin of Ultrasonic Sensor
6Servo   Myservo;
7
8
9void setup() 
10{
11Serial.begin(9600); // Starting Serial   Terminal
12
13Myservo.attach(5);  // Signal Pin of Servo      
14                                       
15pinMode(trigPin,   OUTPUT);
16pinMode(echoPin, INPUT);
17Serial.print("  Distance    ");
18Serial.print("   Measurement  ");
19delay(1000);
20delay(1000);
21Serial.print("Made By :");
22
23Serial.print("   OverAll Technical Gyan");
24delay(2000);
25
26}
27
28void loop()
29{
30   long duration, cm;
31  pinMode(trigPin, OUTPUT);
32  digitalWrite(trigPin, LOW);
33   delayMicroseconds(2);
34  digitalWrite(trigPin, HIGH);
35  delayMicroseconds(10);
36   digitalWrite(trigPin, LOW);
37
38  pinMode(echoPin, INPUT);
39  duration =   pulseIn(echoPin, HIGH);
40  cm = microsecondsToCentimeters(duration);
41  
42
43Serial.print("Distance:");
44   Serial.print(cm);
45  Serial.print("cm");
46  delay(100);
47  
48    if(cm   >= 20){
49Myservo.write(0);
50}
51else {
52Myservo.write(90);
53
54
55}
56
57   Serial.println();
58delay(100);
59
60}
61
62
63long microsecondsToCentimeters(long   microseconds)
64{
65   return microseconds / 29 / 2;
66}

1 
2#include <Servo.h>
3
4const int trigPin = 7; // Trigger Pin of  Ultrasonic Sensor
5const int echoPin = 6; // Echo Pin of Ultrasonic Sensor
6Servo  Myservo;
7
8
9void setup() 
10{
11Serial.begin(9600); // Starting Serial  Terminal
12
13Myservo.attach(5);  // Signal Pin of Servo      
14                                       
15pinMode(trigPin,  OUTPUT);
16pinMode(echoPin, INPUT);
17Serial.print("  Distance    ");
18Serial.print("  Measurement  ");
19delay(1000);
20delay(1000);
21Serial.print("Made By :");
22
23Serial.print("  OverAll Technical Gyan");
24delay(2000);
25
26}
27
28void loop()
29{
30  long duration, cm;
31  pinMode(trigPin, OUTPUT);
32  digitalWrite(trigPin, LOW);
33  delayMicroseconds(2);
34  digitalWrite(trigPin, HIGH);
35  delayMicroseconds(10);
36  digitalWrite(trigPin, LOW);
37
38  pinMode(echoPin, INPUT);
39  duration =  pulseIn(echoPin, HIGH);
40  cm = microsecondsToCentimeters(duration);
41  
42
43Serial.print("Distance:");
44  Serial.print(cm);
45  Serial.print("cm");
46  delay(100);
47  
48    if(cm  >= 20){
49Myservo.write(0);
50}
51else {
52Myservo.write(90);
53
54
55}
56
57  Serial.println();
58delay(100);
59
60}
61
62
63long microsecondsToCentimeters(long  microseconds)
64{
65   return microseconds / 29 / 2;
66}