#include <LiquidCrystal_I2C.h>      // liquidcrystal i2c
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows

int distance[6];

void setup() {
   Serial.begin(115200);

  lcd.init();                   // initialize the lcd
  lcd.backlight();              // Turn LCD light ON
  lcd.clear();                  // clear display
  lcd.setCursor(0, 0);          // move cursor to   (0, 0)
  lcd.print(" W    H    L    ");// print message at (0, 0)
  lcd.setCursor(0, 1);          // move cursor to   (0, 0)
  lcd.print(" Volume =      ");// print message at (0, 0)

  for (int i=15; i<=17; i++) {
    pinMode(i, INPUT);        // Set Pin2 as Input Pin  (connected to ECHO Pin)
  }
  pinMode(A0, OUTPUT);        // Set Pin3 as Output Pin (connected to TRIG Pin)
}

void loop() {

  int j = 2;
    // Start a new measurement:
  for (int i=15; i<=17; i++) {
    digitalWrite(A0, HIGH);          // Start sending the UltraSound Sound
    delayMicroseconds(10);          // Sending Duration 10uSec.
    digitalWrite(A0, LOW);           // End sending the UltraSound Sound

    // Read the result:
    distance[i] = pulseIn(i, HIGH) / 58; 
    lcd.setCursor(j, 0);          // move cursor to      (2, 1)
    lcd.print("   ");    // Clear The Screen at (2, 1)
    lcd.setCursor(j, 0);          // move cursor to      (2, 1)
    lcd.print(distance[i]);          // print message at    (2, 1)
    if (j <16) {j = j + 5; } else {j = 1;}
    delay(50); 
  }
    long Volume = distance[15] * distance[16] * distance[17];
    lcd.setCursor(10, 1);                           
    lcd.print("     ");// print message at (0, 0)           
    lcd.setCursor(10, 1);          // move cursor to   (0, 0)
    lcd.print(Volume);// print message at (0, 0)
    delay(100);      
}