#include <LiquidCrystal.h>
#define trg A0
#define ech A1
int dis =0;
int t=0;
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
void setup() {
  lcd.begin(16, 2);
  lcd.print("distance: ");
  Serial.begin(9600);
  pinMode(trg, OUTPUT);
  pinMode(ech, INPUT);
}
void loop() {
  digitalWrite(trg, LOW);
  delayMicroseconds(5);
  digitalWrite(trg, HIGH);
  delayMicroseconds(10);
  digitalWrite(trg, LOW);
  t=pulseIn(ech,HIGH);
  dis=t/57;
  dis=(dis*.975)+1;//معامل تصحيح الاشاره
  Serial.println(dis);
  delay(200);
  lcd.setCursor(9,0);
  lcd.print(dis);
  lcd.print("  ");
  if(dis<=10){
    lcd.setCursor(0,1);
    lcd.print("warnning");
  }else{
    lcd.setCursor(0,1);
    lcd.print("         ");
  }
  }