#include <NewPing.h>
#define TRIGGER_PIN  6  // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN     5  // Arduino pin tied to echo pin on the ultrasonic sensor.
#define MAX_DISTANCE 50 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.

void setup() {
  Serial.begin(115200); // Open serial monitor at 115200 baud to see ping results.
}

void loop() {
  delay(100);                     // Wait 50ms between pings (about 20 pings/sec). 29ms should be the shortest delay between pings.
  //Serial.print("Ping: ");
  Serial.write(sonar.ping_cm()); // Send ping, get distance in cm and print result (0 = outside set distance range)
  //Serial.println("cm");
}