#include <LiquidCrystal_I2C.h>  // Library to Run I2C LCD LiquidCrystal I2C Library by Frank de Barbander 1.1.2

// We are using I2C 16x2 alphanumeric LCD with HD44780 controller
LiquidCrystal_I2C lcd(0x27, 16, 2);  // Format -> (Address,Columns,Rows )

// define trigger and Echo pin for Ultrasonic sensor
const int TriggerPin = 3;
const int EchoPin = 2;
long distance = 0;

void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("Distance =");
  pinMode(TriggerPin, OUTPUT);
  pinMode(EchoPin, INPUT);
  digitalWrite(TriggerPin, LOW);  // set trigger pin to LOW
  delay(500);
}

void MeasureDistance(void) {
  long TimeinMicroseconds;
  // send a trigger pulse to the sensor of 10 us
  digitalWrite(TriggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(TriggerPin, LOW);
  TimeinMicroseconds = pulseIn(EchoPin, HIGH);
  // speed of sound = 340 m/sec = 0.034 cm/microseconds
  distance = ((0.034) * (TimeinMicroseconds));
  // Here time duration is calculated forward + back time hence to get object distance from sensor divide by 2
  distance = distance / 2;
}
void loop() {
  MeasureDistance();              // This function is used to measure Distance

  // Below Lines are used to Display Data on LCD
  // write column, row and counting starts from zero so 0th Colum and 1st row
  lcd.setCursor(0, 1);
  lcd.print("            ");
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0)
  lcd.setCursor(0, 1);
  lcd.print(distance);
  lcd.print(" cm");

  // provide some time between readings
  delay(100);
}