#define trg A0
#define ech A1
int dis =0;
int t=0;
void setup() {
  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);
  // put your main code here, to run repeatedly:

}