ultrasonic distance calculator

#define trigPin 13

#define echoPin 12

#define led 11

#define led2 10

void setup()

{ Serial.begin (9600);

pinMode(trigPin, OUTPUT);

pinMode(echoPin, INPUT);

pinMode(led, OUTPUT);
pinMode(led_, OUTPUT);

}

void loop()

{ long duration,distance,distmeter ;

digitalWrite(trigPin, LOW);

delayMicroseconds(2);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);


distance = (duration/2) / 29.1;
distmeter = distance/100;

if (distance < 50)

{ digitalWrite(led,HIGH);

}

else {

digitalWrite(led,LOW);

}
if (distance<10)
{
  digitalWrite(led_,HIGH);
  Serial.print("The object is very close!!!!!!!");
  
}
else{
  digitalWrite(led_,LOW);
}

Serial.print("The distance of the object is: ");
Serial.print(distance);

Serial.println(" cm");
Serial.println(distmeter," meter");



delay(500);

}