There is also a serial connection on the board. Does somebody know if its possible to dowlaod the lof file on the SD card by using de serial connection? You can talk to it with any device that can handle SPI, like the arduino.
So the arduino can talk to your card and then use that data for something. It seems thats it is possible, but i realise i have to learn more first, before i start this project I am using the version 22 compiler. I found this on the first look through the examples and libraries.
I tested this -- it works fine on my Mega The Arduino can also talk to the serial port. You could develop an application on the PC that would tell the Arduino to spool data from the SD card back to the PC, via the serial port.
The PC application would then need to store the data spooled back. Not going trough Arduino, so the sd cards looks just like a normal card connected directly to the pc. It uploads about 4 times faster than your current code. I'm making a website with ethernet shield. I wanted to click a link, and download a file from the memory card. Anybody can help me?
That's possible. I wanted to click a link Your web page, provided by the Arduino, needs to contain links. Example: zip file What is the browser going to do with a zip file? Click a link and do a task I know, You haven't demonstrated this. I just wanted the part of the SD. If you are trying to send 18 MBytes at about 11, bytes per second , baud you are in for a long wait. And much longer still if you add data verification.
If the answer to that is yes then it would be simple to write code to send a chunk of data to the PC over the Serial connection. It would also be simple to add, say, a CRC byte or something more sophisticated that allows the program on the PC to verify that it has received the data correctly and send a confirmation message to the Arduino before the Arduino sends the next chunk of data.
If you connect the Arduino to the PC over the USB cable I would expect you could work at , baud or even 1,, baud but I doubt if those speeds are practical over long distances on RS A hardware option could be to buy a usb sd card reader for the pc and build some tri state buffers between the arduino and the SD card, e.
If you are using a Leonardo or Micro its possible to reprogram the board to also present as a disk drive to the PC. I recall that Elektor magazine uses this system I. Without wishing to challenge your technical suggestion I still don't see the point of the OP's requirement - is the Arduino going to generate 18MB of data?
I presumed from what the OP said, was that the arduino was logging a lot of data to the SD card, probably over an extended period, he mentions files each of 50k. Hence the total size on the SD card wold be tens of megabytes. Due to high demand expect some shipping delays at this time, orders may not ship for business days.
Please be positive and constructive with your questions and comments. This is where I'd need some direction. Eventually I'd like to transfer the files via xbee or something similar as I'd like it to operate in areas where there's no cell or internet access , but first I thought it would be a first good step to transfer the pictures over a serial cable. Is there any libraries or tutorials you know of or any other direction you can give me for this. I'm new to embedded systems but am comfortable writing software
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