const int trigPin = 5;
const int echoPin = 18;
//define sound speed in cm/uS
#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701
long duration;
float distanceCm;
float distanceInch;
void setup() {
 Serial.begin(115200); // Starts the serial communication
  pinMode(trigPin, OUTPUT); // Sets the trigPinas an Output
   pinMode(echoPin, INPUT); // Sets the echoPin as an Input
   }
   void loop() {
    // Clears the trigPin
     digitalWrite(trigPin, LOW);
      delayMicroseconds(2);
       // Sets the trigPin on HIGH state for 10 micro seconds
        digitalWrite(trigPin, HIGH);
         delayMicroseconds(10);
          digitalWrite(trigPin, LOW);
           
            // Reads the echoPin, returns the sound wave travel time in microseconds
             duration = pulseIn(echoPin, HIGH);
              
               // Calculate the distance
                distanceCm = duration * SOUND_SPEED/2;
                 
                  // Convert to inches
 distanceInch = distanceCm * CM_TO_INCH;
  
   // Prints the distance in the Serial Monitor
    Serial.print("Distance (cm): ");
     Serial.println(distanceCm);
      Serial.print("Distance (inch): ");
       Serial.println(distanceInch);
        
         delay(1000);
         }