How anomaly ADXL345 data UART? needed help

[mantap]

Here is calibration of UART data using ADXL345.

and the data is followed by x, y & z value, for example x = -42, y = 20, z = 268. and then after calibrated 10x which is I got mean value from (x,y,z*10 of data)/10.0.. I've got x = -26237, y = -18, z = 278.

and my question is why the data of x value is large to calculated, perhaps it's just maybe around -45 (above/lower).

anyone who can explain to fix it..

here is the code:

int calibratex()
{
  int readings[3] = {0, 0, 0};
  led1=1;
  long int sum1  = 0;
  for (int i=0; i<10; i++)
 {
   accelerometer.getOutput(readings);
   xval[i]=(readings[0]);  //nilai x adxl345
   sum1 = yval[i]+sum1;
 }

  xavg=sum1/10.0;

  led1=0;     
  return xavg;
}
 int calibratey()
 {
  int readings[3] = {0, 0, 0};
  led1=1;
  long int sum2 = 0;
  for (int i=0; i<10; i++)
  {
   accelerometer.getOutput(readings);
    yval[i]=(readings[1]); //nilai y adxl345
   sum2 = yval[i]+sum2;
 }
   yavg=sum2/10.0;
   led1=0;     
   return yavg;
 }
  int calibratez()
  {
     int readings[3] = {0, 0, 0};

     led1=1;
     long int sum3 = 0;
     for (int i=0; i<10; i++)
     {
      accelerometer.getOutput(readings);
      zval[i]=(readings[2]); //nilai z adxl345
      sum3 = zval[i]+sum3;
  }

    zavg=sum3/10.0;
    led1=0;     
    return zavg;
 }

[MartinBL]

Not sure if this is the solution, but there is an inconsistency in your three calibration functions:

int calibratex()
{
	int readings[3] = {0, 0, 0};
	led1=1;
	long int sum1  = 0;
	for (int i=0; i<10; i++)
	{
		accelerometer.getOutput(readings);
		xval[i]=(readings[0]);  //nilai x adxl345
		sum1 = yval[i]+sum1;                                     // <- BUG???? Should it be xval?
	}

	xavg=sum1/10.0;

	led1=0;     
	return xavg;
}

[mantap]

do you mean like this one..

accelerometer.setPowerControl(0x08);   
 wait(0.1);
 int avg1 = calibratex();
 wait(0.1);
 int avg2 = calibratey();
 wait(0.1);
 int avg3 = calibratez();

I've tried before using while(1) for looping that measurenment data once. but it's look like the same problem..