Contact Less Hand Sanitizing Machine Using Arduino Nano

Contact Less Hand Sanitizing Machine Using  Arduino Nano

Code

long t; // To store Transit Time 

float x; // To Store Se sing Distance

void setup() {

  // put your setup code here, to run once:

  pinMode (3,OUTPUT);

  pinMode (4,INPUT); 

  pinMode (2,OUTPUT);

}

void loop() {

  // put your main code here, to run repeatedly:

  digitalWrite(3,LOW);

  delayMicroseconds(2);

  digitalWrite(3,HIGH);

  delayMicroseconds(10);

  digitalWrite(3,LOW);

  delayMicroseconds(2);

  t=pulseIn(4,HIGH);

  x=t*343/20000;

   if (x<11 )

  {digitalWrite (2,HIGH);}

  else

  {digitalWrite (2,LOW);}

}