Zittop SD Card Reader/Writer for Arduino and Other Microcontrollers.

The top critical review of this product stated that the card felt loose, but this type of socket can feel that way because it's not held completely motionless with respect to the board. It uses a floating connector inside the socket with much more robust edge-pin connections than the cheaper no-push variety. Definitely not something one would expect at this price point. If you want your project to have a professional feel and operation, this is the one to get. The metal socket frame also extends about 3.5 mm past the edge of the card, so when I cut my panel slot in my project for the SD socket, it will have a secure fit into the panel, and will not merely have to "line up" with the slot like any of the other choices would. It arrived wrapped in full and proper anti-static envelope, unlike some of these other low cost DIY devices. It came with no documentation, but what was in the ad was enough to get it running within 5 minutes of wrapping. The redundant row of the 16 pin DIP header with redundant grounds at both ends was a curiosity in the light of current connector designs for devices of this type, but I see it as nice touch. You can hook it up with an Arduino style 7 pin SIP socket if you like, but the redundant grounds probably provides superior noise immunity for longer cables. The DIP header also takes me back to the days when you could just cut a 0.05" per conductor ribbon cable to any length and width you liked, clip on a couple of press-fit connectors, and you're done with a smart looking setup. Miss those days. While it's true that this unit uses current limiting resistors for overvoltage (all SD readers are 3.3 volts or less at their core) rather than a level converting chip like Adafruit's does, it works perfectly well, and the complete robust construction and build quality plus much lower price make this a worthwhile purchase.

I've been using these in outdoor loggers. For that purpose, I really want a reader with a full-size SD slot. Extra points for the nice push to insert / push to remove action. I mount these upon slightly larger proto-boards, to give a little more room for the hardware to hold it to the chassis & for a couple of indicator LEDs. Try it a few times in dim light and/or with gloves and see if you don't notice the advantage. If you have mosquitos, you might get to where you can change a card one-handed and keep smacking them with the other. <---- EASE OF USE The double connector row could allow daisying a pair of these, e.g. so you could have one "busy" and the other OK to pop out, but I haven't needed to wire more than one in a given box yet. Closest thing to a "CON" -- In a perfect world, I would want a "Card Present" pin brought out. No micro-sized slot offers that feature, but full-size ones can. Yet I won't take any points off five, because this is still a five amongst all the kinds I've used for this purpose. Compatibility, connectivity: sure, it's SDI. Your microcontroller probably has a lot of the relevant pins lined up along one edge of the chip. Value for money: really darn good. And consider that your data is worth something too. These have saved me some amount of grubbing around hunting for dropped micro-SD cards (I'm thinking of the ubiquitous all-in-one logger shields that are OK indoors, some of which also drop 1220 batteries.)

I added this to an arduino data logging project and it works perfectly. A diagram is included to help you wire it which is sufficient if you use a little common sense. The card slot has a positive click on insertion and holds the sd card securely.

Product arrived quickly. Comes with a single-sided instruction sheet showing how to make connections to Arduino and where to find sample code within the Arduino IDE. Takes just a few minutes to connect via the instructions and I was writing test data to SD card with sample code immediately after that. Very easy for anyone with even basic Arduino knowledge to use. There's a number of code samples showing different methods of using the SD card that comes with the IDE. Slot that holds SD card feels just a bit loose to me... it's hard to tell when the SD card is inserted properly. Many SD card slots have a definite click upon insertion and holds the card well. This one grabs the card upon insertion but you can just slightly pull the card and it lets go. A minor complaint really, but one that should be noted.

Works great and solved the problem I was having with my current SD card reader

Great product. Easy project installation. Worked as advertised.

Used this to log data using the ArduinoSD library

Very easy to use, comes with good documentation as others have said. Seems to work well without the 5v pin being used when connected to an Arduino Due.