Read out SD via USB

Other Hardware Storage
1

Hi,

I'm making a monitoring project for which I need a SD card to store data.
First I used the Ethernet shield but since it too much battery power, I just made a SD socket and removed the shield.
But to the point: I need to read out this info at regular times and it is difficult to remove the SD card every time.
So my question is: Is it possible to read files from the SD card with USB?
Else I have to put back the Ethernet shield to connect but I would like to avoid that.

Thank you in advance for your answer.

Sjamoe.

2

Is it possible to read files from the SD card with USB?

Not directly.

You can have an application send serial data to the Arduino, telling the Arduino that you want the contents of one of the files on the SD card, and the Arduino can send the data back sssslllloooowwwwllllyyyy.

3

Hmm any suggestions how to implement that?
Speed is not at all crucial...
... As long as it only takes a few minutes at most of course :slight_smile:

4

I think this is a good starting-point

Micro SD card Tutorial - using SD cards with an Arduino! :slight_smile:

5

I've already found that tutorial and the reading from and writing to the card already works perfectly.
Also the logging works perfect.
I just wanted to know how to read out this card via usb. So when I plug the board with all its sensors via usb into my computer, I would like to make modifications to the SD card. Is that possible? And what is a good way to start?

6

I just wanted to know how to read out this card via usb.

You're not listening. You can't have the PC read the card.

You can have the PC tell the Arduino to read the card, and send the data it read from the card to the PC, via the serial port.

So when I plug the board with all its sensors via usb into my computer, I would like to make modifications to the SD card.

You can write an application to talk to the Arduino. The application can tell the Arduino to read and spool back the card, or just tell the Arduino to modify the file.

And what is a good way to start?

Just Do It! as Nike says.