/*
Fenil Chandarana
Fab Academy 2022
Webpage link: https://fabacademy.org/2022/labs/vigyanashram/students/fenil-chandarana/
*/

#include <SoftwareSerial.h>
SoftwareSerial mySerial(1, 0); // RX, TX

#define trigPin 8
#define echoPin 9

void setup() {
  mySerial.begin (57600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  long duration, distance;
  digitalWrite(trigPin, LOW); 
  delayMicroseconds(2); 
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;

  if (distance >= 200 || distance <= 0){
    mySerial.println("Out of range");
  }
  else {
    mySerial.print(distance);
    mySerial.println(" cm");
  }
  delay(500);
}