ultrasonic.ino

#include <LiquidCrystal.h> //Load Liquid Crystal Library
LiquidCrystal LCD(7, 6, 5, 4, 3, 2);  //Create Liquid Crystal Object called LCD

int trigPin = 11; //Sensor Trip pin connected to Arduino pin 11
int echoPin = 10; //Sensor Echo pin connected to Arduino pin 10
int myCounter = 0;  //declare your variable myCounter and set to 0
int servoControlPin = 6; //Servo control line is connected to pin 6
float pingTime;  //time for ping to travel from sensor to target and return
float targetDistance; //Distance to Target in centimeters
float speedOfSound = 776.5; //Speed of sound in miles per hour when temp is 77 degrees.

void setup() {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  LCD.begin(16, 2); //Tell Arduino to start your 16 column 2 row LCD
  LCD.setCursor(0, 0);  //Set LCD cursor to upper left corner, column 0, row 0
  LCD.print("Target Distance:");  //Print Message on First Row
}

void loop() {
  digitalWrite(trigPin, LOW); //Set trigger pin low
  delayMicroseconds(2000); //Let signal settle
  digitalWrite(trigPin, HIGH); //Set trigPin high
  delayMicroseconds(15); //Delay in high state
  digitalWrite(trigPin, LOW); //ping has now been sent
  delayMicroseconds(10); //Delay in high state

  pingTime = pulseIn(echoPin, HIGH);  //pingTime is presented in microseconds
  pingTime = pingTime / 1000000; //convert pingTime to seconds by dividing by 1000000 (microseconds in a second)
  pingTime = pingTime / 3600; //convert pingtime to hours by dividing by 3600 (seconds in an hour)
  targetDistance = speedOfSound * pingTime;  //This will be in miles, since speed of sound was miles per hour
  targetDistance = targetDistance / 2; //Remember ping travels to target and back from target, so you must divide by 2 for actual target distance.
  targetDistance = targetDistance * 2.54 * 100;    //Convert miles to centimeters by multiplying by 2.54 (centimeters per inch) and 100 to convert to centimeters.

  LCD.setCursor(0, 1);  //Set cursor to first column of second row
  LCD.print("                "); //Print blanks to clear the row
  LCD.setCursor(0, 1);   //Set Cursor again to first column of second row
  LCD.print(targetDistance); //Print measured distance
  LCD.print(" cm");  //Print your units.
  delay(250); //pause to let things settle
}