#include <LiquidCrystal_I2C.h>
#include <NewPing.h>

int lcdColumns = 20;
int lcdRows = 4;

LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);

// Ultrasonic sensor pins
const int trigPin = 13;
const int echoPin = 12;

// Maximum distance to measure in centimeters
const int maxDistance = 400;

NewPing sonar(trigPin, echoPin, maxDistance);

void setup() {
  // Initialize LCD
  lcd.init();
  // Turn on LCD backlight
  lcd.backlight();
}

void loop() {
  // Measure distance using the ultrasonic sensor
  int distance = sonar.ping_cm();

  // Set cursor to first column, first row
  lcd.setCursor(0, 0);

  // Print distance measurement and duration
  lcd.print("Distance: ");
  lcd.print(distance);
  lcd.print(" cm");

  // Calculate duration from distance (assuming speed of sound is 343 m/s)
  float duration = distance / (343.0 / 100.0); // Convert cm to m and calculate duration in seconds

  // Print duration
  lcd.setCursor(0, 1);
  lcd.print("Duration: ");
  lcd.print(duration); // Convert seconds to milliseconds
  lcd.print(" s");

  delay(1000);
  lcd.clear();
}