Serial Data Logger Compatible with Arduino and Raspberry Pi Board. with USB Function, FAT32 File System, Support 32GB TF Card. for Data Acquisition, Robot, UAV Debugging and Other Projects.

it is working with even 115200 speed, length of recorded string is 40 symbols

I'm testing a bare metal ESP32-WROOM-32UE IC on a test fixture, and needed something that would be as close as possible to the production board that will be eventually made. This fit the bill nicely. I was able to use it in SDIO and SPI modes right out of the box without any problems.Came packaged in an ESD-safe bag inside a nice plastic container. That little bit of extra thought goes a long way for me since I've had so many delicate electronic parts arrive damaged or not properly packaged.

Very useful tool. Been using them to turn wifi ports into a secondary SDIO (SDIO1) on hacked web camera's. Doing some web cam reverse engineering hardware and embedded Linux stuff,

Connected this up to my Arduino Nano. Before connecting to 3.3v power line, I found that the Arduino was actually putting out 3.7v. So I added an LDO converter to supply this micro SD reader with proper 3.3v.I followed the guide on how to implement this in a test Arduino sketch. Since I was using a Nano, I found a diagram showing the default SPI pins, and used those. There's printing on the backside of the card module that shows MOSI/MISO etc. Or you can follow the guide. Wrote and read the card fine. I did see that it is including the SD library. That's a default one in Arduino IDE. So you need not install it. Would be nice if that was specified in the directions for us NEWBs.Would be nice to know what pin 7, 8, and 9 do. Just says "reserved".Product seems pretty good quality. No complaints really, other than some additions to the WIKI. Would also be nice if this had a 5v input with 5v to 3.3v built in LDO. Other cards have that. Those LDOs are dirt cheap. And would be convenient as most breadboard tinkering is done at 5v. Maybe I can make a 5v to 3.3v LDO hat for this... ha!

Would not work with ESP32 Pico development board using SDIO interface. Card would not mount. Switched to holder from Adafruit and everything worked fine. Might be a problem with the pull up resistors and mentioned by other users.

Card uses too strong of pull-up for most dev boards. Could not get it to work on any STM32 Nucleo. Ended up using a Sparkfun SD breakout that works great.