Here is the minimum amount of sketch you need to use the Newping library.
#include <NewPing.h>
#define TRIGGER_PIN 12 // Arduino pin tied to trigger pin on ping sensor.
#define ECHO_PIN 13 // Arduino pin tied to echo pin on ping sensor.
#define MAX_DISTANCE 200 // 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.
unsigned int pingSpeed = 50; // How frequently are we going to send out a ping (in milliseconds). 50ms would be 20 times a second.
unsigned long pingTimer = 75; // Holds the next ping time, start at 75ms to give time for the Arduino pins to stabilize.
void setup() {
}
void loop() {
// Notice how there's no delays in this sketch to allow you to do other processing in-line while doing distance pings.
if (millis() >= pingTimer) { // pingSpeed milliseconds since last ping, do another ping.
pingTimer += pingSpeed; // Set the next ping time.
int cm = sonar.ping_cm(); // Send out the ping, get the results in centimeters.
}
}
This is the part that saves the results to a variabable named "cm". You could change "cm" to distance, length, or fred if it makes you happy.
int cm = sonar.ping_cm(); // Send out the ping, get the results in centimeters.