![]() 7 is an output, and the Arduino can recognize 3.3V as high, so no voltage converter is necessary here. All but 7 are inputs to the card, and so must be brought down to 3.3V from 5V when using the Arduino Duemillenove. SD mode rearranges some pins and uses all of them. The SPI mode only uses pins 1-7, leaving off the small one and the recessed one (8 and 9). For the Arduino, however, only the SPI mode can be used. ![]() ![]() Specifics on these can easily be found on wikipedia's SD card page. Thanks to frollard for the idea! I've also included a pinout of an SD card by request. Plus there aren't any pins on the backplane that could short against something! Thats never a good thing. I did each one individually with pliers and holding the pins in visegrips this time. Bending them back a little more in the second step is better as well. I recommend bending the pins a bit more in the first step so to ensure that all are making good contact. ![]() This is best suited for the final version of a circuit, a one off custom circuit, or a good prototype without waiting for th final socket. I have found that by bending the pins in the same fashion for a single row of right angle header and attaching that to the PCB or perfboard, you have a flat, robust SD socket. After a little discussion in the comments and elsewhere, I have taken a more permanent approach to this idea. ![]()
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