Review on 📚 HiLetgo 5pcs Micro SD TF Card Adapter Reader Module with 6Pin SPI Interface for Arduino UNO R3 MEGA 2560 Due by Donnie Boss

I use them a lot in my Arduino Uno and Arduino Mega projects. I've used 8GB and 32GB Class 4 or Class 10 microSD cards with no problems when using the Arduino's 5V supply. Although I was able to get them to work with the ESP8266 based nodeMCU chip, in most cases the initialization step in the sketch failed. I suspect that the 3.3 volts provided by the ESP8266 node MCU is not enough. I will look for ways to power both the ESP8266 nodeMCU and the Micro SD TF card adapter from a 5V power supply,