#include "Ultrasonic.h"
unsigned long distance = 0;
Ultrasonic ultrasonic(2, 3);

void setup() {
  // put your setup code here, to run once:
  pinMode(2, OUTPUT);
  pinMode(3, INPUT);
  pinMode(7, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  //digitalWrite(2, LOW);
  //delayMicroseconds(1);
  //digitalWrite(2, HIGH);
  //delayMicroseconds(10);
  //digitalWrite(2, LOW);
  //distance = pulseIn(3, HIGH, 10000);
  //delay(10000);
  distance = ultrasonic.read(CM);
  if(distance==0){
  digitalWrite(7, HIGH); }
}