HiLetgo 5pcs Micro SD TF Card Adater Reader Module 6Pin SPI Interface Driver Module with chip Level Conversion for Arduino UNO R3 MEGA 2560 Due

Great cheap option. They worked as designed

SD card works great. Esp32 already comes with the built in SD library, so just include SD.h and SPI.h and you should be good to go.

I originally ordered for data collection with a weather server along a pi pico w. After hours of micro py, circuit py, and arduino I gave up. I only found I could get it to work with a pi pico 2 using circuit python.ESP32 I have found no problem on any model using circuit python.The module itself is nicely made and packed. Hopefully a breakthrough soon.

Well designed and very easy to implement. They have been working well with Arduinos and nodemcu's, capturing temperature and time data at the refrigerators at the local food pantry. It's small, but the micro SD card pops out when you press down on it, so it's really easy to load and unload. I like that it uses spi, and I can use the I2C for the clock.

I'm using this with an Arduino to write out files to an SD card. Works great. They seem very stable. I've been working on my program for about a month or so and so far they have been very stable.

Confirmed to work with ESP 12-E.The pin connections are as the follows (left = SD module pin, right = ESP 12-E pin) :CS => D8SCK => D5MOSI => D7MISO => D6VCC => Vin (* 5v, not 3.3v)GND => GNDNote that, the VCC must connect to the 5V Vin for the module to work (if powered through USB port).NodeMCU documentation says 3.3v, which does not seem to apply to this module, because there is a on-board voltage regulator on the module, taking only 5v input.Another thing to note is, the example sketches under ESP8266/Example/SD are not using the right CS pin (recommended by NodeMCU) at the SD.begin() function, and you would have to change this line to SD.begin(15) to make it work.

I plugged it into my ESP32 board and was able to read and write files using Arduino libraries in a few minutes. So cheap, easy to use, and adds a lot of capability to any microcontroller board.

First off, this flaw appears to afflict nearly all of these micro SD "generic" brand parts from China. To be 5VDC and 3VDC compatible, they use a level shifter. But it's connected to the MISO line and, when you are running 5VDC, IT WILL NOT RELEASE THE MISO LINE!!!So, if you're running this card either as the only thing on the SPI bus, or running it on a 3V3 system, it's probably okay. If you're running it on a 5V system with other things on the bus, every other card on the bus will get blocked by this one holding the MISO line high when not in use. You can bodge on a wire and cut a trace to get it working, but you should just go buy the Adafruit version which is properly designed and works exactly as advertised.Search "SPI MISO Pni Conflict - Storage" on Google and click the first result (Arduino forum) for an in-depth discussion. For me, this little gotcha cost me probably 12-15 hours of troubleshooting an encoder and encoder buffer card never realizing that this card was the problem all along.