Question

Has anyone worked on the SensorDump Android app before? I’m trying to get Accelerometer values from my phone and I’ve been able to dump it in to a CSV file on my computer. However, I’d like to add a timestamp to my values as well and SensorDump doesn’t provide for that.

I can’t find any documentation online ,and I was wondering if anyone had tried to modify it, or if there’s any other app out there that does the same (i.e. lets me write Sensor Values onto a file, with timestamp).

Thanks!

Answer 1

I wrote my own sensor dumper, in an activity with something like this in the onCreate:

    mStartTime = SystemClock.uptimeMillis()
        try {
                    f = new FileWriter("/sdcard/download/sensorlog.txt");
                    if (f != null) {
                        f.append("time;value0;value1;value2\r\n");
                    }
        } catch (IOException e1) {
        Log.e(TAG, "Cannot open sensorlog file..");
    }


mSensorManager = (SensorManager) this.getSystemService(Context.SENSOR_SERVICE);
    mStepListener = new SensorEventListener() {
    @Override
        public void onAccuracyChanged(Sensor arg0, int arg1) {  
        }

        @Override
        public void onSensorChanged(SensorEvent event) {

            Sensor sensor = event.sensor;
            if (sensor.getType() == Sensor.TYPE_ACCELEROMETER) {

                double value0 = event.values[0];
                double value1 = event.values[1];
                double value3 = event.values[2];

                long time = SystemClock.uptimeMillis() - mStartTime;


                try {
                    if (f != null) {
                        f.append(time+";"+value0+";"+value1+";"+value2 + "\r\n");
                    }
                } catch (IOException e) {
                    Log.e(TAG, "Cannot write to file");
                }

            }
        }

    };

This will give you a csv text file, with a timestamp and the 3 values.

ps. Don’t forget to ask for SD-card write permission.

Also declare this first:

    FileWriter f;
private SensorManager mSensorManager;
private SensorEventListener mStepListener;

And don’t forget to close the file..

try {
    f.close();
} catch (IOException e) {
    Log.e(TAG, "Cannot close file");
}