Simple Ultrasonic Distance Measurer With LCD Display

1#include <LiquidCrystal.h> //Load Liquid Crystal Library
2LiquidCrystal  LCD(12, 11, 5, 4, 3, 2);  //Create Liquid Crystal Object called LCD
3 
4int  trigPin=9; //Sensor Trip pin connected to Arduino pin 9
5int echoPin=7;  //Sensor  Echo pin connected to Arduino pin 7
6int myCounter=0;  //declare your variable  myCounter and set to 0
7int servoControlPin=6; //Servo control line is connected  to pin 6
8float pingTime;  //time for ping to travel from the sensor to the target  and return
9float targetDistance; //Distance to Target in Centimeters
10float  speedOfSound=776.5; //Speed of sound in miles per hour
11 
12void setup() {
13  
14Serial.begin(9600);
15pinMode(trigPin, OUTPUT);
16pinMode(echoPin, INPUT);
17LCD.begin(16,2);  //Tell Arduino to start your 16x2 LCD
18LCD.setCursor(0,0);  //Set LCD cursor to  upper left corner, column 0, row 0
19LCD.print("Distance:");  //Print Message  on First Row
20}
21 
22void loop() {
23  
24  digitalWrite(trigPin, LOW); //Set  trigger pin low
25  delayMicroseconds(2000); //Let signal settle
26  digitalWrite(trigPin,  HIGH); //Set trigPin high
27  delayMicroseconds(15); //Delay in high state
28  digitalWrite(trigPin, LOW); //ping has now been sent
29  delayMicroseconds(10);  //Delay in high state
30  
31  pingTime = pulseIn(echoPin, HIGH);  //pingTime  in microceconds
32  pingTime=pingTime/1000000; //convert pingTime to seconds by  dividing by 1000000 (microseconds in a second)
33  pingTime=pingTime/3600; //convert  pingtime to hours by dividing by 3600 (seconds in an hour)
34  targetDistance=  speedOfSound * pingTime;  //This will be in miles, since we declared the speed of  sound as kilometers per hour; although we're going to convert it back to centimeters  
35  targetDistance=targetDistance/2; //Remember ping travels to the target and  back from the target, so you must divide by 2 for actual target distance.
36  targetDistance=  targetDistance*160934,4;    //Convert miles to centimeters by multipling by 160934,4  
37
38 
39  
40  LCD.setCursor(0,1);  //Set the cursor to the first column of  the second row
41  LCD.print("                "); //Print blanks to clear the  row
42  LCD.setCursor(0,1);   //Set Cursor again to the first column of the second  row
43  LCD.print(targetDistance); //Print measured distance
44  LCD.print("  centimeters");  //Print your units
45  delay(250); //Pause to let things settle
46  
47}