const int trigPin = 5;

const int echoPin = 18;

#define SOUND_SPEED 0.034 //define sound speed in cm/us

#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 trigpin as an Output

pinMode (echoPin, INPUT); // Sets the trigpin as an Output

}

void loop() {

digitalWrite(trigPin, LOW);  // Clears the trigpin

delayMicroseconds (2);

digitalWrite(trigPin, HIGH); // Sets the trigPin on HIGH state for 1

delayMicroseconds (10);

digitalWrite (trigPin, LOW);

duration = pulseIn (echoPin, HIGH); 

distanceCm = duration * SOUND_SPEED/2;
// Calculate the distance

distanceInch = distanceCm * CM_TO_INCH;

Serial.print ("Distance (cm): "); // Prints the distance in the Serial monitor

Serial.println(distanceCm);

Serial.print ("Distance (inch): ");

Serial.println(distanceInch);

delay(1000);

}