I Just wonder if Is possible to connect an SD card to Arduino OPTA for data logging...
I don't own an OPTA so can't be 100% sure, but looking at the pinouts that Arduino provide, I could not see any of the 3 OPTA variants that exposed any SPI pins which you would need in order to directly access the SD card.
Another possibility - assuming that there is a serial port accessible somewhere, is a Sparkfun OpenLog data logger.
If your OPTA variant has an RS485 port and you don't use it, then you could use that to send data to an OpenLog board - with a suitable RS485 board connected to it to convert the serial stream back to TTL voltage levels.
There may be access to SPI pins inside the unit but that would mean opening it up and soldering some connections onto the board which would invalidate any warranty you had.
Hello mascal,
Check out this tutorial, it shows how to use memory stick. I've done it and it works, Somewhere inside program there is line of code that you have to comment (USB stick) and uncomment (SD card), but I might be wrong because i've used a few methods recently.
What I discovered is this method of data logging is unfortunately slow and not efficient, but for simple programs it can work.
Also you have ready examples of SD usage from Opta library in Arduino IDE:
Tnx u mate !!!
What I wonder Is if there's an SD Card inside the OPTA in bundle...