NewPing Library: HC-SR04, SRF05, SRF06, DYP-ME007, Parallax PING))) - v1.7

Using Arduino Sensors
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Here is the code that I normally use:

#include <NewPing.h>

#define TRIGGER_PIN  12
#define ECHO_PIN     13
#define MAX_DISTANCE 200  // In Centimeters (200cm = 78.7") It will not keep waiting for a return if past this value

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);

void setup() {
  Serial.begin(9600);
}

void loop() {
  float uS = sonar.ping_median(5);
  Serial.print(uS / US_ROUNDTRIP_IN);
  Serial.print("a");
}