Automatic Faucet (Touchless) Using Arduino for COVID-19

1// 66. AUTOMATIC FAUCET(TOUCHLESS) USING ARDUINO
2// ARDUINO PROJECTS  BY R
3// AUTHOR: RUCKSIKAA RAAJKUMAR
4#define trig 5
5#define echo 4
6const  int Relay = 6;
7long duration;
8int distance;
9void setup() {
10  pinMode(trig,  OUTPUT); // Set the trigger pin as OUTPUT
11  pinMode(echo, INPUT); // Set the  echo pin as INPUT
12  pinMode(Relay, OUTPUT); // Configure the pin of the relay  module as OUTPUT
13  Serial.begin(9600); // Set baud rate as 9600
14}
15void  loop() {
16  digitalWrite(trig, LOW);
17  delayMicroseconds(5);
18  digitalWrite(trig,  HIGH);
19  delayMicroseconds(10);
20  digitalWrite(trig, LOW);
21  duration =  pulseIn(echo, HIGH); // Calculate time taken (in microseconds) for the pulse emitted  by the trigger pin to reach the echo pin.
22  distance = (duration/2) * (331.3/10000);  // Calculate the distance from the sensor to the obstacle in cm, using the speed  of sound in air(m/s) and the time taken (stored in duration variable)
23  Serial.println(distance);
24  if(distance>1 && distance<10){ 
25    digitalWrite(Relay, HIGH); //Turns on the  submersible water pump or solenoid water valve
26  }else{
27    digitalWrite(Relay,  LOW); //Turns off the submersible water pump or solenoid water valve
28   }
29   delay(2000); // Set a delay period of 2 seconds to prevent the clicking of the  relay module
30}
31