Dustin Schie schie

## hc-sr04.ino
/* HC-SR04 Sensor
   https://www.dealextreme.com/p/hc-sr04-ultrasonic-sensor-distance-measuring-module-133696

   This sketch reads a HC-SR04 ultrasonic rangefinder and returns the
   distance to the closest object in range. To do this, it sends a pulse
   to the sensor to initiate a reading, then listens for a pulse
   to return.  The length of the returning pulse is proportional to
   the distance of the object from the sensor.

   The circuit:
	/* HC-SR04 Sensor
	https://www.dealextreme.com/p/hc-sr04-ultrasonic-sensor-distance-measuring-module-133696

	This sketch reads a HC-SR04 ultrasonic rangefinder and returns the
	distance to the closest object in range. To do this, it sends a pulse
	to the sensor to initiate a reading, then listens for a pulse
	to return. The length of the returning pulse is proportional to
	the distance of the object from the sensor.

	The circuit: