////////////// كود الاردوينو لمشروع الالتراسونيك
///////////// Ultrasonic Distance Meter By Ahmed Fayed www.etqan.sa
const int trigPin = 2;
const int echoPin = 3;
#include 
// the LCD I2C Module contains A0,A1,A2 to change the address.
// so we make 3 addresses as below
// lcd1 address 0x27  because A0,A1, and A2 not soldered
// I2C module connected to A4 from arduino (SDA) and A5 (SCL)
LiquidCrystal_I2C lcd1(0x27, 16, 2); // LCD1
// defines variables
long duration;
int distance;
void setup() {
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
  lcd1.init();                      // initialize the lcd
  lcd1.backlight();
  lcd1.setCursor(3, 0);
  lcd1.print("UltraSonic");
  lcd1.setCursor(1, 1);
  lcd1.print("Distance Meter");
}
void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.017;
  if (distance >= 4 && distance <= 350)
  { lcd1.setCursor(0, 1);
    lcd1.print("Distance=");
    lcd1.setCursor(9, 1);
    lcd1.print("      ");
    lcd1.setCursor(9, 1);
    lcd1.print(distance);
    lcd1.print("cm");
  }
  else
  { lcd1.setCursor(0, 1);
    lcd1.print("Distance=");
    lcd1.setCursor(9, 1);
    lcd1.print("      ");
  }
  delay(500);                    
}