Thursday, December 27, 2012

Parallax Rangefinder output to Parallax 2x16 Serial LCD

Da Code:

My Code:

const int TxPin = 2;
const int pingPin = 7;

#include <SoftwareSerial.h>
SoftwareSerial mySerial = SoftwareSerial(255, TxPin);

void setup() {
  // initialize serial communication:
  pinMode(TxPin, OUTPUT);
  digitalWrite(TxPin, HIGH);
  mySerial.write(12);                 // Clear             
  mySerial.write(17);                 // Turn backlight on
  delay(5);                           // Required delay
  mySerial.print("ShawnRobot 1.0");  // First line
  mySerial.write(13);                 // Form feed
  mySerial.print("second line test");   // Second line
  mySerial.write(212);                // Quarter note
  mySerial.write(220);                // A tone
  delay(3000);                        // Wait 3 seconds
  mySerial.write(18);                 // Turn backlight off
  mySerial.write(12);                 // Clear

void loop() 
  // establish variables for duration of the ping, 
  // and the distance result in inches and centimeters:
  long duration, inches, cm;
  // The PING))) is triggered by a HIGH pulse of 2 or more microseconds.
  // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:
  pinMode(pingPin, OUTPUT);
  digitalWrite(pingPin, LOW);
  digitalWrite(pingPin, HIGH);
  digitalWrite(pingPin, LOW);
  // The same pin is used to read the signal from the PING))): 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(pingPin, INPUT);
  duration = pulseIn(pingPin, HIGH);
  // convert the time into a distance
  inches = microsecondsToInches(duration);
  cm = microsecondsToCentimeters(duration);
  mySerial.write(12);                 // Clear
  mySerial.write(17);                // Turn backlight on
  mySerial.print("in ");
  mySerial.print("cm ");
long microsecondsToInches(long microseconds)
  // According to Parallax's datasheet for the PING))), there are
  // 73.746 microseconds per inch (i.e. sound travels at 1130 feet per
  // second).  This gives the distance travelled by the ping, outbound
  // and return, so we divide by 2 to get the distance of the obstacle.
  // See:
  return microseconds / 74 / 2;

long microsecondsToCentimeters(long microseconds)
  // The speed of sound is 340 m/s or 29 microseconds per centimeter.
  // The ping travels out and back, so to find the distance of the
  // object we take half of the distance travelled.
  return microseconds / 29 / 2;

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