int Trig;
int Echo;

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

}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(Trig, HIGH);
delayMicroseconds(1);
digitalWrite(Echo, LOW);
delayMicroseconds(10);

}