Range Finder using Ultra Sonic Sensor and Arduino uno

 

Circuit Diagram 

Program Code

#include <LiquidCrystal.h>

LiquidCrystal lcd(11, 10, 9, 7, 6, 5, 4);

int pingPin = 13;

int inPin = 12;

int duration,inches,cm;

void setup() {

Serial.begin(9600);

lcd.begin(16, 2);

lcd.print("testing...");

}

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 ms or more

// Give a short LOW pulse beforehand to ensure a clean HIGH pulse:

pinMode(pingPin, OUTPUT);

digitalWrite(pingPin, LOW);

delayMicroseconds(2);

digitalWrite(pingPin, HIGH);

delayMicroseconds(10);

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(inPin, INPUT);

duration = pulseIn(inPin, HIGH);

// Convert the time into a distance

inches = microsecondsToInches(duration);

cm = microsecondsToCentimeters(duration);

lcd.clear();

lcd.setCursor(0, 0);

lcd.print(inches);

lcd.print("in, ");

lcd.print(cm);

lcd.print("cm");

delay(100);

  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 ms/in (i.e. sound travels at 1130 fps).

// This gives the distance traveled by the ping, outbound,

// and return, so divide by 2 to get the distance of the obstacle.

return (microseconds/74)/2;

}

long microsecondsToCentimeters(long microseconds) {

// The speed of sound is 340 m/s or 29 ms/cm.

// The ping travels out and back, so to find the distance

// of the object, take half of the distance traveled.

return (microseconds/29)/2;

}

Ultra Sonic Sensor HEX file:

https://drive.google.com/file/d/1PfmGSTwtQHo9-LgflN0eONYtiB1x3fPn/view?usp=sharing