(:source http://github.com/arduino/Arduino/raw/master/build/shared/examples/06.Sensors/Ping/Ping.ino lang=arduino tabwidth=4:)

(:source http://github.com/arduino/Arduino/raw/master/build/shared/examples/6.Sensors/Ping/Ping.ino lang=arduino tabwidth=4:)

Ping Ultrasonic Range Finder

Examples > Sensors

• serial.begin()

• return

The Ping))) is an ultrasonic range finder from Parallax. It detects the distance of the closest object in front of the sensor (from 2 cm up to 3m). It works by sending out a burst of ultrasound and listening for the echo when it bounces off of an object. The Arduino board sends a short pulse to trigger the detection, then listens for a pulse on the same pin using the pulseIn() function. The duration of this second pulse is equal to the time taken by the ultrasound to travel to the object and back to the sensor. Using the speed of sound, this time can be converted to distance.

The Ping))) is an ultrasonic range finder from Parallax. It detects the distance of the closest object in front of the sensor (from 2 cm up to 3m). It works by sending out a burst of ultrasound and listening for the echo when it bounces off of an object. The Arduino board sends a short pulse to trigger the detection, then listens for a pulse on the same pin using the [Reference/PulseIn | pulseIn()]] function. The duration of this second pulse is equal to the time taken by the ultrasound to travel to the object and back to the sensor. Using the speed of sound, this time can be converted to distance.

• delayMicroseconds()

The Ping))) is an ultrasonic range finder from Parallax. It detects the distance of the closest object in front of the sensor (from 2 cm up to 3m). It works by sending out a burst of ultrasound and listening for the echo when it bounces off of an object. The Arduino board sends a short pulse to trigger the detection, then listens for a pulse on the same pin. The duration of this second pulse is equal to the time taken by the ultrasound to travel to the object and back to the sensor. Using the speed of sound, this time can be converted to distance.

Hardware Required

• Arduino Board
• (1) Ping Ultrasonic Range Finder
• hook-up wire

See Also:

• pinMode()
• delayMicroseconds()?
• pulseIn()
• digitalWrite()
• serial.Begin()
• serial.print()

• ADXL3xx - read a ADXL3xx accelerometer.
• Ping - detect objects with an ultrasonic range finder.
• Memsic2125 - two-axis acceleromoter.
• Knock - detect knocks/impacts with a piezo element

(:source http://github.com/arduino/Arduino/raw/master/build/shared/examples/6.Sensors/Ping/Ping.pde lang=arduino tabwidth=4:)

(:source http://github.com/arduino/Arduino/raw/master/build/shared/examples/Sensors/Ping/Ping.pde lang=arduino tabwidth=4:)

 (:source http://github.com/arduino/Arduino/raw/master/build/shared/examples/Sensors/Ping/Ping.pde language=arduino tabwidth=4:)

 (:source http://github.com/arduino/Arduino/raw/master/build/shared/examples/Sensors/tonePitchFollower/tonePitchFollower.pde language=arduino tabwidth=4:)

(:divend:)

image developed using Fritzing. For more circuit examples, see the Fritzing project page

(:div class=code :)

 /* Ping))) Sensor
   
    This sketch reads a PING))) ultrasonic rangefinder and returns the
    distance to the closest object in range. To do this, it sends a pulse
    to the sensor to initiate a reading, then listens for a pulse 
    to return.  The length of the returning pulse is proportional to 
    the distance of the object from the sensor.
      
    The circuit:
 	* +V connection of the PING))) attached to +5V
 	* GND connection of the PING))) attached to ground
 	* SIG connection of the PING))) attached to digital pin 7

    http://www.arduino.cc/en/Tutorial/Ping
    
    created 3 Nov 2008
    by David A. Mellis
    modified 30 Jun 2009
    by Tom Igoe

  */

 // this constant won't change.  It's the pin number
 // of the sensor's output:
 const int pingPin = 7;

 void setup() {
   // initialize serial communication:
   Serial.begin(9600);
 }

 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);
   delayMicroseconds(2);
   digitalWrite(pingPin, HIGH);
   delayMicroseconds(5);
   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);

   Serial.print(inches);
   Serial.print("in, ");
   Serial.print(cm);
   Serial.print("cm");
   Serial.println();

   delay(100);
 }

 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: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
   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;
 }

(:divend:)

/* Ping))) Sensor

   This sketch reads a PING))) ultrasonic rangefinder and returns the
   distance to the closest object in range. To do this, it sends a pulse
   to the sensor to initiate a reading, then listens for a pulse 
   to return.  The length of the returning pulse is proportional to 
   the distance of the object from the sensor.

   The circuit:
	* +V connection of the PING))) attached to +5V
	* GND connection of the PING))) attached to ground
	* SIG connection of the PING))) attached to digital pin 7

   http://www.arduino.cc/en/Tutorial/Ping

   created 3 Nov 2008
   by David A. Mellis
   modified 30 Jun 2009
   by Tom Igoe

 */

// this constant won't change. It's the pin number // of the sensor's output: const int pingPin = 7;

void setup() {

  // initialize serial communication:
  Serial.begin(9600);

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);
  delayMicroseconds(2);
  digitalWrite(pingPin, HIGH);
  delayMicroseconds(5);
  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);

  Serial.print(inches);
  Serial.print("in, ");
  Serial.print(cm);
  Serial.print("cm");
  Serial.println();

  delay(100);

}

long microsecondsToInches(long microseconds) {

click the image to enlarge

Schematic:

click the image to enlarge

The Ping))) is an ultrasonic range finder from Parallax. It detects the distance of the closest object in front of the sensor (up to 3m). It works by sending out a burst of ultrasound and listening for the echo when it bounces off of an object. The Arduino board sends a short pulse to trigger the detection, then listens for a pulse on the same pin. The duration of this second pulse is equal to the time taken by the ultrasound to travel to the object and back to the sensor. Using the speed of sound, this time can be converted to distance.

The Ping))) is an ultrasonic range finder from Parallax. It detects the distance of the closest object in front of the sensor (up to 3m). It works by sending out a burst of ultrasound and listening for the echo when it bounces off of an object. The Arduino board sends a short pulse to trigger the detection, then listens for a pulse on the same pin. The duration of this second pulse is equal to the time taken by the ultrasound to travel to the object and back to the sensor. Using the speed of sound, this time can be converted to distance.

The 5V pin of the PING))) is connected to the 5V pin on the Arduino, the GND pin is connected to the GND pin, and the SIG (signal) pin is connected to digital pin 7 on the Arduino.

The Ping))) is an ultrasonic range finder from Parallax. It detects the distance of the closest object in front of the sensor. It works by sending out a burst of ultrasound and listening for the echo when it bounces off of an object.

Circuit

Ping Ultrasonic Range Finder

Code

int pingPin = 7;

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  long duration, inches, cm;

  // The PING))) is triggered by a HIGH pulse of 2 or more microseconds.
  // We give a short LOW pulse beforehand to ensure a clean HIGH pulse.
  pinMode(pingPin, OUTPUT);
  digitalWrite(pingPin, LOW);
  delayMicroseconds(2);
  digitalWrite(pingPin, HIGH);
  delayMicroseconds(5);
  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);

  Serial.print(inches);
  Serial.print("in, ");
  Serial.print(cm);
  Serial.print("cm");
  Serial.println();

  delay(100);
}

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: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf
  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;
}