Project 2 - Measuring distance of an object using ultrasonic sensor (HC-SR04)

// P2: Using Ultrasonic sensor measure the distance *//

static int Eco=8;
static int Trig=9;
static int Switch=10;

void setup()                // setup fuction to set mode of pins
{
  Serial.begin(9600);      // Baud rate that means amout of bits transfer per second
  pinMode(Eco,INPUT);      // declare Eco pin as INPUT pin
  pinMode(Trig,OUTPUT);    // declare Trig pin as OUTPUT pin
  pinMode(Switch,INPUT);   // declare Switch pin as INPUT pin
}

void loop()                    // continuous folling loop after start program
{
  if(digitalRead(Switch)==1);   // swich to activate utrasonic sensor
  {
  int count,Distance;           // variable to store mesured distance
  digitalWrite(Trig,LOW);      // make Trig pin as LOW
  delay(5);
  digitalWrite(Trig,HIGH);    // making Trig pin as HIGH to pass signal
  delay(10);
  digitalWrite(Trig,LOW);    // make Trig as LOW
  count=pulseIn(Eco,HIGH);   // waite to catch that bounceback that signal
  Distance=(count/2)*0.0343;  // calculate the exact distance using formula
  Serial.print("Distance=");  // print string on serial monitor
  Serial.print(Distance);     // print distance on serial monitor
  }
}