#include <LiquidCrystal.h> // Include LiquidCrystal library for LCD display functionality
//LiquidCrystal lcd(RS, E, D4, D5, D6, D7);
LiquidCrystal lcd(2, 4, 9, 10, 11, 12); // Initialize the arduino pins connected to LCD


#define PIN_TRIG A3 // Define the pin connected to the trigger pine of the ultrasonic sensor
#define PIN_ECHO A4 // Define the pin connected to the echo pine of the ultrasonic sensor

void setup() {
  Serial.begin(115200); // Begin serial comunication at a baud rate of 115200
  pinMode(PIN_TRIG, OUTPUT); // Set the trigger pin as an output
  pinMode(PIN_ECHO, INPUT); // Set the echo pin as an input
  lcd.begin(16, 2); // Initialize the LCD with 16 columns and 2 rows
  lcd.print("Distance in:"); // print the charecters  on the first row
}

void loop() {
  // Start a new measurement:
  digitalWrite(PIN_TRIG, HIGH); // set the trigger pin high to send a pulse
  delayMicroseconds(10); // wait for 10ms
  digitalWrite(PIN_TRIG, LOW); // set the trigger pin low to end the pulse

  // Read the result:
  int duration = pulseIn(PIN_ECHO, HIGH); // mesure the duration ot pulse on echo pin
  
  double distance = (duration * 0.0343) / 2; // calculate the distance in cm based on the duration devided by to becuse the pulse send from sensore and again reflection form object and recive

  // lcd.clear(); // clear the LCD
  
  // these code print on lcd
  
  lcd.setCursor(0, 1); // move the cursor to the secend row
  lcd.print(distance); // print the distance
  lcd.print("  CM  "); // print "CM"
  
  // these code print on serial monitor like computer
  Serial.print(distance); // print the distance on computer
  Serial.println("  CM"); // print "CM" on computer

  delay(700); // wait for 700ms
}