#include <LiquidCrystal.h>

int trigPin=3;
int echoPin=2;
float pingTime;  //time for ping to travel from sensor to target and return
float targetDistance; //Distance to Target in cms
float speedOfSound=776.5; //Speed of sound in miles per hour when temp is 77 degrees.

const int rs = 12, en = 11, d4 = 4, d5 = 5, d6 = 6, d7 = 7;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
 
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  lcd.begin(16, 2);

}

void loop() {
  // put your main code here, to run repeatedly: 
  
  digitalWrite(trigPin, LOW); //Set trigger pin low
  delayMicroseconds(1000); //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 low state
  
  pingTime = pulseIn(echoPin, HIGH);
  pingTime=pingTime/1000000;
  pingTime=pingTime/3600;
  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*63360;    //Convert miles to inches by multipling by 63360 (inches per mile)
  
  Serial.print("Distance: ");
  Serial.print(targetDistance);
  Serial.println(" cms");
  delay(100); //delay tenth of a  second to slow things down a little.
}

void printOut()
 {
  lcd.clear();
    lcd.setCursor(0, 0); 
    lcd.print("Distance: ");
    lcd.setCursor(0, 1); 
    lcd.print(" cms");

 }