This is a PING ultrasonic range finder with sound and display. I had to combine the LCD , a beeper's and the PING software. All you need are, Arduino board, LCD display, potentiometer, and a beeper.
The software;
/* Ping))) Sensor and LCD Readout and Beeper
http://arduino.cc/en/Tutorial/LiquidCrystal
Software modified to include LCD readout and sound beeper by Odunmbaku Abdulakeem
*/
// include the library code:
#include
// initialize the LCD library with the numbers of the LCD interface pins
LiquidCrystal lcd(12, 11, 10, 5, 4, 3, 2);
int backLight = 13; // pin 13 will control the backlight
// pin number of the sensor's output:
const int pingPin = 7; //Pin for Ultrasound sensor
int speakerPin = 9; //Pin for the beeper
void setup() {
pinMode(speakerPin, OUTPUT); //Set speaker Pin 9 as output
// set up the LCD's number of rows and columns:
lcd.begin(16, 2);
// set the cursor to column 0, line 0
lcd.setCursor(0, 0);
// Print inches to the LCD.
lcd.print("inches");
lcd.setCursor(0, 1);
// Print cm to the LCD.
lcd.print("cm");
// 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();
// set the cursor to column 8, line 0
lcd.setCursor(8, 0);
lcd.print(" ");
lcd.setCursor(8, 0);
lcd.print(inches);
// set the cursor to column 8, line 1
lcd.setCursor(8, 1);
lcd.print(" ");
lcd.setCursor(8, 1);
lcd.print(cm);
if(cm <= 5)
{
analogWrite(speakerPin,500);
delayMicroseconds(100);
//analogWrite(speakerPin, 0);
//delayMicroseconds(100);
}
else
{
analogWrite(speakerPin, 0);
delayMicroseconds(500);
}
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;
}
The beeper makes sound when the distance is less than or equal to 5c.m.
