EJBlogger's Accellerologger code

accellerologger.ino

#include <SparkFun_ADXL345.h>
#include <SD.h>
#include <SPI.h>

//ADXL345 adxl = ADXL345(10); For SPI Cumunication
ADXL345 adxl = ADXL345();
File myFile;
const int threshold = 1499;
const int switchPin = 7;
int switchState;
int ctr = 0;
int pinCS = 10;
int x, y, z;
int sumX, sumY, sumZ;

void setup() {
  Serial.begin(9600);
  Serial.println();
  pinMode(pinCS, OUTPUT);
  pinMode(switchPin, OUTPUT);

  adxl.powerOn();

  adxl.setRangeSetting(16);

  adxl.setSpiBit(0);
  myFile = SD.open("test.txt", FILE_WRITE);
}


void loop() {
  //define int x, y, z in setup instead
  // also define int sumX, sumY, sumZ in setup
  adxl.readAccel(&x, &y, &z);
  sumX += x;
  sumY += y;
  sumZ += z;

  switchState = digitalRead(switchPin);

  if (switchState == HIGH) {
    ctr++;
    if (ctr > threshold) {
      if (myFile) {
        myFile.print(sumX / threshold); myFile.print(",");
        myFile.print(sumY / threshold); myFile.print(",");
        myFile.println(sumZ / threshold);
      }
      else {
        Serial.println("error opening test.txt");
      }
      
      Serial.print(sumX / threshold); Serial.print(",");
      Serial.print(sumY / threshold); Serial.print(",");
      Serial.println(sumZ / threshold);
      
      sumX = 0;
      sumY = 0;
      sumZ = 0;
      ctr = 0;
    }

  } else //switchState != HIGH
  {
    myFile.close();
    Serial.println("closed");
  }
}