/*
  Title: Ultrasonic_sensor.ino
  Author: Lucas Lim 
  Date Created: 2/4/2019
  Last Modified: 4/4/2019
  Purpose: To activate Ultrasonic sensor and send data to computer

  Ultrasonic sensor Pins:
     VCC: +5V DC
     Trig : Trigger (INPUT) - Arduino Pin9 (PB1)
     Echo: Echo (OUTPUT) - Arduino Pin10 (PB0)
     GND: GND

  Original code created by Rui Santos, https://randomnerdtutorials.com
 */

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

 
int trigPin = 9;    // Trigger
int echoPin = 10;   // Echo
long duration, cm, inches;
 
void setup() {
  //Serial Port begin
  mySerial.begin (9600);
  //Define inputs and outputs
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}
 
void loop() {
  // The sensor is triggered by a HIGH pulse of 10 or more microseconds.
  // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
  digitalWrite(trigPin, LOW);
  delayMicroseconds(5);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
 
  // Read the signal from the sensor: a HIGH pulse whose
  // duration is the time (in microseconds) from the sending
  // of the ping to the reception of its echo off of an object.
  pinMode(echoPin, INPUT);
  duration = pulseIn(echoPin, HIGH);
 
  // Convert the time into a distance
  cm = duration/58;         // uS divide by 58 to give cm
  inches = duration/148;    // uS divide by 148 to give inches
  
  mySerial.print(inches);
  mySerial.print("in, ");
  mySerial.print(cm);
  mySerial.print("cm");
  mySerial.println();
  
  delay(250);
}