/*
  MSJ Researchers World
  Date - 18th NOV 2024
  Mentor - Mr. Siranjeevi M
  Contact - 7373771991
*/

// Define pins for Ultrasonic Sensor
const int trigPin = 9;  // Trigger pin
const int echoPin = 10; // Echo pin

// Variable to store the duration and distance
long duration;
int distanceCm;
float distanceIn;

void setup() 
{
  // Initialize serial communication
  Serial.begin(9600);

  // Set pin modes
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() 
{
  // Send a 10-microsecond pulse to trigger pin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echo pin and calculate the duration
  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance in cm and inches
  distanceCm = duration * 0.034 / 2; // Speed of sound = 0.034 cm/μs
  distanceIn = distanceCm * 0.393701; // 1 cm = 0.393701 inches

  // Print the distance in cm and inches to the serial monitor
  Serial.print("Distance: ");
  Serial.print(distanceCm);
  Serial.print(" cm, ");
  Serial.print(distanceIn);
  Serial.println(" in");

  // Wait before the next measurement
  delay(500);
}