SD Card module - fails to work with Mega

Using Arduino Storage
1

I have tried three SD modules (cheap Chinese no name) two with six pins and one with a 7th 3.3V pin.

None of the examples in the SD library can initialize any of the modules and report "Initialization failed!" which is the condition SD.begin(4) == 0. I have checked the wiring connections to the Mega multiple times. I have also swapped the MISO/MOSI. No LED (if any) lights on the module.

The pins are the driver defaults 4 CS, 11 MOSI, 12 MISO, 13 CLK .

I understand that these modules operate at 3.3V, but also accept a 5V MCU, as they have a VCC pin, and the description appears to say it will work with any Arduino. They come with a LDO regulator. Link is to the description of the module. Any help will be greatly appreciated.

2

Have you tried them on an UNO to confirm they work okay?

On the Mega the SPI pins are different...
MISO = pin 50
MOSI = pin 51
SCK = pin 52
CS = pin 53

1 Like
3

WOW! Pins 50 thru 53 worked. Thanks muchly.

I had seen that somewhere but had completely forgotten about it. Thanks for the reminder!

4

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.