SD module problem

Other Hardware Storage
1

Hi, everyone.

I'm trying to run the CardInfo example to test this SD module, but I keep getting the "initilization failed" message.

Here is the setup:

Any ideas?

Thanks in advance.

IMG_20141230_101757307_HDR.jpg
IMG_20141230_101757307_HDR.jpg2592×1456 918 KB

2

where does the SD card gets 5V from?
I only see GND connected

cannot see the SD break out connections.

3

robtillaart:
where does the SD card gets 5V from?
I only see GND connected

cannot see the SD break out connections.

The rightmost yellow jumper is on 5V.

4

Those SD boards are notorious for fails like this. It does not have a logic level converter. The 4 resistors you see on that board are pullup resistors connected to the 3.3v power bus.

Putting a digital 5 volt line from the Arduino into a 3.3 volt input on the SD card can have unpredictable and sometimes destructive results to either the Arduino or the SD card.

5

I don't know what is your code, but I have an SD module like yours and it works for me. I tested it with this code. BTW, I use an Arduino MEGA, but I think it have no influence in this.

6

SurferTim:
Those SD boards are notorious for fails like this. It does not have a logic level converter. The 4 resistors you see on that board are pullup resistors connected to the 3.3v power bus.

Putting a digital 5 volt line from the Arduino into a 3.3 volt input on the SD card can have unpredictable and sometimes destructive results to either the Arduino or the SD card.

Should I try the 3.3V pin?

7

It is the digital data lines (SCK, MOSI, and SS) that cause the problems, not the power supply to the SD card. A level converter of some type is recommended.

8

luisilva:
I don't know what is your code, but I have an SD module like yours and it works for me. I tested it with this code. BTW, I use an Arduino MEGA, but I think it have no influence in this.

Still no luck. Really lost here.

I've tried four different SD cards after formatting them, but nothing changed.

9

SurferTim:
It is the digital data lines (SCK, MOSI, and SS) that cause the problems, not the power supply to the SD card. A level converter of some type is recommended.

I don't have one. Is there anything else I could do?

10

Not the most efficient, but you can use a voltage divider. Connect the SD card MOSI pin to the '^' in this schematic. Do the same to the SCK and SS lines.

MOSI - 1Kohm - ^ - 2Kohm - GND