#include <LiquidCrystal.h>
int rs = 6;
int en = 7;
int d4 = 8;
int d5 = 9;
int d6 = 10;
int d7 = 11;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
int echoPin = 3;
int triggerPin = 2;
float tT;
int st = 100;
float dist; //distance meters
float distI; //distance inches
float conv = (6.2 / 10000); //convert from meters to miles
float sS = 343.; //speed of sound
float sConv = 1000000.*2.; // convert from microseconds to seconds and halve the time
float convI = 39.37;
int dt = 3000;
int buttonPin = 13;
int buttonNew;
int buttonOld = 1;
int i;

void setup() {
  lcd.begin(16, 2);
  pinMode(echoPin, INPUT);
  pinMode(triggerPin, OUTPUT);
  pinMode(buttonPin, INPUT);
  digitalWrite(buttonPin, HIGH);
  Serial.begin(9600);
}
void loop() {
  buttonNew = digitalRead(buttonPin);
  //Serial.println(buttonNew);
  lcd.setCursor(0,0);
  lcd.print("Place the target");
  lcd.setCursor(0,1);
  lcd.print("Press to measure");


  if (buttonOld == 0 && buttonNew == 1) {
    for (i = 0; i < 1; i++) {
      digitalWrite(triggerPin, LOW);
      delayMicroseconds(st);
      digitalWrite(triggerPin, HIGH);
      delayMicroseconds(st);
      digitalWrite(triggerPin, LOW);

      tT = pulseIn(echoPin, HIGH);
      dist = (tT / sConv) * sS;
      distI = (dist * convI);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Distance(m) = ");
      lcd.setCursor(0, 1);
      lcd.print(dist);
      lcd.print("m ");
      delay(dt);
      
    }
  }
  buttonOld = buttonNew;
}