Detecting movement

As I wrote in an other post, I want to detect movement of the device. As of now I'm not interested in the direction[*], just that the device is moving. I'm using the following code, and it seems to work. Is there a better way?

Code:

#include <Wire.h>
#include <FXOS8700CQ.h>


static FXOS8700CQ accMagSensor = FXOS8700CQ(0x1E);

static float factor;

void setup() {
  Serial.begin(115200);
  Wire1.begin();
  accMagSensor.init(); 
  factor = accMagSensor.getAres();
}



void loop() {
  static unsigned long nextDisplay = 0;
  const unsigned long now = millis();


  if (accMagSensor.isAccelDataRdy()) {
    accMagSensor.readAccelData();

    if (now >= nextDisplay) {
      float f = factor * sqrt(pow(accMagSensor.accelData.x,2) +
        pow(accMagSensor.accelData.y,2) +
        pow(accMagSensor.accelData.z,2));

      if (f < 0.995 || f > 1.015) {
        Serial.println(f);
      }
      nextDisplay = now + 500;
    }
  }
}

[*] I don't need it for my idea, but still.... I'd like to know how to do that

 

I am in the know that @estebanSannin developed a similar demo with UDOO Neo some time ago.
In this demo, UDOO Neo tweets whenever you move it.
Esteban, can you point @Maurice in the right direction?

 

Here is the code for automatic detection:
http://www.slideshare.net/maubau/udoo-iot-platform
We've uploaded the presentation of the demo I were talking about.