Ferocildo

the following code create all directories but the last! why?

using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.IO;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.NetduinoPlus;
//using LoveElectronics.Sensors.Accelerometers;

namespace ADXL345_test
{
    public class Program
    {
        private static StreamWriter sw;
        private static FileStream fs;

        public static void Main()
        {
            OutputPort led = new OutputPort(Pins.ONBOARD_LED, false);
            InputPort Switch1 = new InputPort(Pins.ONBOARD_SW1, true, Port.ResistorMode.Disabled);

            while (!Switch1.Read())
            {}

            led.Write(true);

            Directory.CreateDirectory(@"SD\Netduino");

            fs = new FileStream(@"SD\Netduino\test.txt", FileMode.Create, FileAccess.Write, FileShare.None, 512);

            Directory.CreateDirectory(@"SD\Netduino1");

            sw = new StreamWriter(fs);

            Directory.CreateDirectory(@"\SD\Netduino2");
            sw.WriteLine("test");

            Directory.CreateDirectory(@"\SD\Netduino3");
            sw.Close();

            Directory.CreateDirectory(@"\SD\Netduino4");
            fs.Close();

            Directory.CreateDirectory(@"\SD\Netduino5");

        }

    }
}

Well, The problem was the FAT file system ( default windows formatting ). Using FAT32 I could write thousands of file on the same directory.. however writing times degrade with increasing number of files on the same directory

@Bendage

Here: https://www.loveelec...how-to-use-them

you can find anything you need to get ADXL345 working.

Anyway, to reach 1 KHz sampling rates I made some tweaks

using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.IO;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.NetduinoPlus;
using LoveElectronics.Sensors.Accelerometers;

namespace ADXL345_test
{
    public class Program
    {
        private const int nSamples = 2048;

        private static byte[] bufArray = new byte[nSamples * 6];
        private static byte[] buffer = new byte[6];
        private static byte[] addrbuffer = new byte[] { 0x32 };

        private static I2CDevice.I2CTransaction[] transaction = new I2CDevice.I2CTransaction[]
            {
                I2CDevice.CreateWriteTransaction(addrbuffer),
                I2CDevice.CreateReadTransaction(buffer)
            };

        public static void Main()
        {
            OutputPort led = new OutputPort(Pins.ONBOARD_LED, false);

            ADXL345 accel = new ADXL345();
            // Ensure that we are connected to the accel
            // (this will throw an exception if the accel does not respond).
            if (accel.EnsureConnected())
            {
                Debug.Print("ADXL345 was found!");
            }

            // Tell the accel we are interested in a range of +/- 2g.
            accel.Range = 2;
            // Tell the accel we want it to use full resolution.
            accel.FullResolution = true;
            // Enable the measurements on the device.
            accel.EnableMeasurements();
            // Set the data rate to output at 3200Hz
            accel.SetDataRate(0x0F);
            
            while (true)
            {

                for (int i = 0; i < nSamples; i++)
                {
                    // Get the newest data from the accelerometer.
                    // Manually getting readings instead of accel.ReadAllAxis()
                    // bufArray contains x, y and z packed on 6 bytes

                    accel.Execute(transaction, 1000);
                    buffer.CopyTo(bufArray, i * 6);


                }
             

            }
        
        }

    }
}

Hi Chris, I connect the N+ to a board that supply 24V and 3.3V so I can't give 5V or 12V ( for the Vin ) to N+. The 3.3V should be able to give 400 mA.

I just tried the Directory.CreateDirectory(@"\SD\Netduino"); line code alone, but nothing happens. I've also tried formatting by Windows7 with FAT32 my 2GB SD card. Maybe I'll try buying another sd card, however writing of files is working, so that's strange