please anyone can help me, I'm working with a microSD module and arduino uno and I have no idea how to connect it, maybe someone knows a library or some code and how to be connected. thank you very much
The built-in SD library should be all the library you need: SD - Arduino Reference
Here is a tutorial for the Adafruit microSD card breakout board with level shifters: Micro SD card Tutorial - using SD cards with an Arduino! It tells you how to wire it up and everything.
If you have a different microSD module you might need to add the 3.3V level shifters since the Arduino UNO use 5V logic and the SD card uses 3.3V logic.
two modules can be connected to the Arduino uno and to work with both at the same time, what happens is that I need to save information of operation errors in a micro sd and that the user can not manipulate it and in the other micro sd the user is prompted for authentication data, in this micro sd you can manipulate.
thanks for your comments.
I would also recommed fat16lib's SD library, kept very up to date.
http://code.google.com/p/fat16lib/
Might even support 2 SD cards already.
do you know if there are other way to save my information without use both the sim card and eeprom memory .
there must be another device that replace these options
do you know if there are other way to save my information without use both the sim card and eeprom memory .
it is not a sim card, it is SD card . sorry
Sure, there is FRAM (mouser.com), has the speed of SRAM and unpowered storage ability of EEPROM.
There's also some kind of magnetic chip memory, was brought up here in the forum, thought I had the site bookmarked, but I guess not.