Arduino uno + SD card module

Other Hardware Storage
1

Hi People i need to build a datalogger with arduino uno and a sd card, can i use this on ebay

I read about this solution but I am not shure if the Sd card module (link below) works directly in arduino uno.

http://www.ebay.com/itm/SD-Card-Module-Slot-Socket-Reader-For-Arduino-UNO-MEGA-R3-DUE-NANO-as-MP3-loader-/221265694726?pt=UK_Computing_Other_Computing_Networking&hash=item3384769006

this connects directly in the arduino uno, or need more other board (shield??)

best

cpalha

2

Read this thread. Same voltage levels apply to the Uno.
http://forum.arduino.cc/index.php?topic=182819.0
I recommend, as I did in that thread, to use a SD card with a logic level converter.

3

Hi SurferTim

"That SD card has no logic level converter"

I can find it on ebay? Can you recomend some one SD card or module with logic level converter?

Best

CPalha

4

I don't know about eBay, but here is one:

5

Hi CPalha,

It will work directly, that sdcard reader have a 3.3v regulator included (AMS1117), so you don't need to care about voltages.
Just put 5v or the 3.3v from arduino directly in the corresponding pin 3v3 or 5v.

I'm using a similar one in one of my projects.

6

gordonpt:
It will work directly, that sdcard reader have a 3.3v regulator included (AMS1117), so you don't need to care about voltages.
Just put 5v or the 3.3v from arduino directly in the corresponding pin 3v3 or 5v.

That is not correct. If it was, the OP would not have a problem. On that SD card, there is no level converter. It may work with your SD card, but it may not on others.

7

Mine have level conversion with a resistors, if this one doesn't have it will be very strange.
If they care about powering with 3v3 why they leave it without level conversion for communication?

Anyway CPalha, I can't guarantee that. make sure that resistors are a tensor divisor.

or do it your self like this http://img441.imageshack.us/img441/2391/schematicuo7.jpg

8

Then it is very strange! Those resistors you see on that board are 10K pullups, not voltage dividers. They do nothing for the voltage levels. Putting 5 volts into a 3.3v input can damage both devices.