#define pin_trig 11
#define pin_echo 10

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(pin_trig , OUTPUT);
pinMode(pin_echo, INPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(pin_trig,HIGH);
delayMicroseconds(10);
digitalWrite(pin_trig , LOW);
int duration = pulseIn(pin_echo,HIGH);
float distance = duration * 0.017;
Serial.println("distance in cm: ");
Serial.println(distance);
delay(1000);
}