TI-Nspire & Arduino、超音波距離計 1、サンプルスケッチを試す

The following sketch drives an Ultra Sonic range measurement module - Sensor - Seeed Studio to measure distances.

.ino

/***************************************************************************/
//  Function: Measure the distance to obstacles in front and print the distance
//        value to the serial terminal.The measured distance is from
//        the range 0 to 400cm(157 inches).
//  Hardware: Ultrasonic Range sensor
//  Arduino IDE: Arduino-1.0
//  Author:  LG
//  Date:    Jan 17,2013
//  Version: v1.0 modified by FrankieChu
//  by www.seeedstudio.com
//
//  This library is free software; you can redistribute it and/or
//  modify it under the terms of the GNU Lesser General Public
//  License as published by the Free Software Foundation; either
//  version 2.1 of the License, or (at your option) any later version.
//
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//  Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with this library; if not, write to the Free Software
//  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
//
/*****************************************************************************/
#include "Arduino.h"
class Ultrasonic
{
  public:
    Ultrasonic(int pin);
    void DistanceMeasure(void);
    long microsecondsToCentimeters(void);
    long microsecondsToInches(void);
  private:
    int _pin;//pin number of Arduino that is connected with SIG pin of Ultrasonic Ranger.
    long duration;// the Pulse time received;
};
Ultrasonic::Ultrasonic(int pin)
{
  _pin = pin;
}
/*Begin the detection and get the pulse back signal*/
void Ultrasonic::DistanceMeasure(void)
{
  pinMode(_pin, OUTPUT);
  digitalWrite(_pin, LOW);
  delayMicroseconds(2);
  digitalWrite(_pin, HIGH);
  delayMicroseconds(5);
  digitalWrite(_pin, LOW);
  pinMode(_pin, INPUT);
  duration = pulseIn(_pin, HIGH);
}
/*The measured distance from the range 0 to 400 Centimeters*/
long Ultrasonic::microsecondsToCentimeters(void)
{
  return duration / 29 / 2;
}
/*The measured distance from the range 0 to 157 Inches*/
long Ultrasonic::microsecondsToInches(void)
{
  return duration / 74 / 2;
}

Ultrasonic ultrasonic(7);
void setup()
{
  Serial.begin(9600);
}
void loop()
{
  long RangeInInches;
  long RangeInCentimeters;
  ultrasonic.DistanceMeasure();// get the current signal time;
  RangeInInches = ultrasonic.microsecondsToInches();//convert the time to inches;
  RangeInCentimeters = ultrasonic.microsecondsToCentimeters();//convert the time to centimeters
  Serial.println("The distance to obstacles in front is: ");
  Serial.print(RangeInInches);//0~157 inches
  Serial.println(" inch");
  Serial.print(RangeInCentimeters);//0~400cm
  Serial.println(" cm");
  delay(100);
}