Stemedu 2PCS Micro SD Card Module TF Card Memory Storage Adapter Reader Board SPI Interface with Integrated Circuit Breakout for Arduino for Raspberry Pi

Once aware of the specifications, it works perfectly. I spent hours trying to figure out why it wouldn't work, finally checking back on this page when I should have done that in the first place. It takes 5v, not 3.3v, which is a good feature and it was my mistake for blindly following directions from other places that couldn't have possibly known this detail. I switched the 3.3v to 5v and it worked first try! If you are getting initialization failures, especially no response to CMD 41, then you may have made the same mistake I did.

This is a great module. I love the dual pins and providing access to the 3.3v supply. Arduinos are lackluster with their 3.3v. The problems I had, may not be the module. It could be the card itself. I opened one up and they have lots of critters on their pcb. Using with RF24 and cc1101 I found that the SD Card would be blasting gibberish on the MISO line, even with CS set High. I tinkered with lots of attempts to solve this. What finally worked: I used A1015 PNP transistor with emitter towards SD and collector towards MCU. A 4.7k resistor from base to cs pin. Now the MISO can only output to the MCU if CS is low, as intended. So far that solution is working flawlessly and I have implemented it on multiple devices. I don't have a way to verify if it's the card or the module. But if you suspect you're experiencing that issue, simply unplug the miso from your sd card. If your radio magically works; my trick will too.

Reliable SD card module. I wish the pins would not be right angled, but I guess they are like that for a reason. For my application, this would need to be plugged into a motherboard parallel to the board. Anyway, not a big deal to de-solder and solder other pins in, the price is unbeatable.

Worked as intended

Designed for 5v but can easily be converted to 3.3v by replacing the regulator chip with a solder short. 2 pack means I now have both a 5v (unmodified) and a 3.3v (modified per above) version in my kit.

Good for small project. Happy with it

I bought this to use with my Arduino Uno so I could read the CID info from some microSD cards. I had a regular SD card breakout board (ASIN B0089SYU9C) that I used just fine, all I did was swap the pins with this board, but it wouldn't even initialize. Here's my code: #include <SPI.h> #include <SD.h> Sd2Card uSdCard; cid_t cid; const int uSdChipSelect = 10; void setup() { Serial.begin(9600); if (!uSdCard.init(SPI_FULL_SPEED, uSdChipSelect)) { Serial.print("ERROR init. uSD reader"); exit(1); } delay(100); uSdCard.readCID(&cid); if (cid.always1 != 1) { Serial.print("ERROR CID data was miread"); exit(1); } uint8_t* pCid = (uint8_t*) & cid; for (int i = 0; i < sizeof(cid); i++) { Serial.print(pCid[i], HEX); } } void loop() { // Empty }

Almost worthless. Pay a few bucks extra for something more worthwhile from adafruit. I wasted a good 10 hours trying to get these to work properly before using something else. The money is the problem, the invested time is

With the Arduino's SD library its super easy to use and connect. The description is really good at showing the wiring diagram, the limitations in terms of SD card size and example code.