5PCS Micro SD Card Module Mini TF Card Read Write Sensor with SPI Interface for Arduino Raspberry Pi Storage Board Breakout Female to Female Dupont Cable

Using this on ESP32, follow example wiring where it's connected to VIN (assuming you're powering ESP32 via USB port), not 3.3V. It doesn't work on 3.3V and you will get error "[E][sd_diskio.cpp:739] sdcard_mount(): f_mount failed 0x(3)" or similar error. It has a good range of supply power voltage but it still doesn't go down to 3.3V (although logic level is 3.3V so works fine plugged directly into ESP32's SPI pins).

if not working for you try changing pin 4 to 10 or 9 if you cant use 10(adafruit)

Received as advertised

I am building a temperature recorder for my cabin, to determine how cold it get inside during the winter. I am recording the readings to SD, so I have a record even if the power goes off. The program will restart. I haven't programmed in C++ for about 30 years. It is a bit of a relearning curve. Also today's documentation is so poor you have test everything to ensure it works. So far I have be able to record several files on the SD. The big limitation is the maximum file size is 4 GB, so you have to calculate the amount of data storage you will use and see if you have to implement multiple files to record it.

Read and write was working fine. After couple of months for some reason it does not write to the sd card anymore.