@wjcroft : the "SD card Only"  present on github,   has been writen by Joel.    It has been for me a starting point from which I increased the sample rate and I suppressed overruns.

Yes @biomurph, the Host on the Dongle and it works very well when I choose the channel of another one  of our 3 new Cards...

Yannick @yj is the SD-card-only expert, I'm going to let him comment on the command strings / file closeout.

* Save data only to the SD card. Uploading the OpenBCI_32-write-to-DS-only code should not be the problem, but I'm not too sure about the commands. Do I need to send something like 'N' 'G' and close a

Here's a couple more related threads, discussing storing to the SD card alone, and disabling the RFduino transmission. This workaround by @yj seems to confirm that the freezes are related to main boar

the OBCI Card current is low, the voltage drop in the wires 100mA x 0.1 ohm = 10mV... not too much...

Have you tried looking at the other threads mentioning SD Card?

I bought a SD Card and have it format FAT32. However the board cannot write the data of over 100MB size into the card. During that recording time, the board wrote out many information as “write file f

Have you choosen te rigth Card in "tools/Cards" menu ?

+ SD CARD

I want to upload the firmware (with using SD card only) provided in Github (https://github.com/OpenBCI/OpenBCI_32-write-to-DS-only).

We will likely hit the SD Card code for Simblee in Q1 of next year.

That said, when we have working code blocks (like driving the SD card) we will post those parts as they are developed.

I am using a Simblee chip on my project and have not been able to connect an SD card. The example read/write code provided in the Arduino IDE 1.6.5 does not even compile. If you have worked out this i

Do not worry Anh,   8 times faster and shorter @ 2kHz,      is well related to "the speed of writing the data from the Board to the SD card."

speed of writing the data from the Board to the SD card. Please correct me if I still misunderstand.

I hesitated to use them because I was afraid to break some time dependent processes during SD card writing...

The idea of the interrupt routine is to allow data acquisition to go on in parallel with other processes. Such as signal processing, or addressing your question, the SD card. If double buffering is us

Would it help increase the speed of writing the data to the SD card when increasing the sampling rate using your modified code?

1. The files were from the SD card (in form of hex value)