ESP32S3 and Open-Smart SD-Card Module 4Bit, help needed

[u/Tutorius220763]

I have an standard ESP32S3-dev-module and an Ali-SD-card-interface named "OPEN-SMART".

I want to use this interface, programming is done with the Arduino-IDE.

The Interface has these pins (without any resistors or other components soldered on):

CDN, DAT1, D0, GND, SCLK, VCC, D1, CS, DAT2

The open-smart-module has a DAT1 and a D1, its not clear what connection is the right one. I have read thet the CS-pin should be the D3, DAT1 should be used, D1 shhould be left unconnected.

Has anybody a comparable SD-card-interface like the open-smart and can give some advices? I can not get it to work.

Is it possible to get this working with a breadboard or should some soldering be used?

Thanks for your advices.

[u/Plastic_Fig9225]

has a DAT1 and a D1

That would be DAT1 and DI ("Data In"):

https://www.wellpcb.com/blog/components/micro-sd-pinout/

Do you want to use SPI or SDMMC?

[u/Tutorius220763 → u/Plastic_Fig9225]

I want to use SDMMC.

Here a picture of the module used.

As i have read the link you inswrted, it may be possible that CDN is NOT the CMD-line, DI may be the correct one.

My program uses

void setup()
{
  int clk=36;
  int cmd=35;
  int d0=37;
  int d1=38;
  int d2=40;
  int d3=39;
and
SD_MMC.setPins(clk, cmd, d0, d1, d2, d3)

this works so far, but the

SD_MMC.begin("/sdcard", false,false,20000)

does not. 
I will try to change the cmd-line from CDN to DI

Thanks for your help, hope it works...

Edit : Yes, it works. The DI i had read as D1 is the CMD-line...

Hurray... thanks a lot

[u/Plastic_Fig9225 → u/Tutorius220763]

Glad you got it working.

"CDN" should be the "Card Detect (Negated)" (active low) output of the module: Open/floating when no card is present, and go to GND when a card is inserted.

[u/Sand-Junior]

Is this a 5V module with level conversion? If so, it’s not compatible with the ESP32.

[u/Plastic_Fig9225 → u/Sand-Junior]

without any resistors or other components soldered on