Have you ever been in a situation where you really needed more memory space? Perhaps you’re looking for a solution to that. This product is equips your Arduino with mass-storage capability! What can it be used for? Well, it can be used for many things such as data-logging for example.
An SPI interface helps in achieving communication with microSD cards.
The SCK, DI, and DO pins of the microSD socket are broken out to the ATmega168/328's standard SPI pins (digital 11-13), while the CS pin is broken out to Arduino's D8 pin. If you decide to use one of the many open source FAT libraries (like FAT16 or SDFat) make sure to change the code to reflect the location of the CS pin.
Since most libraries assume the CS pin is connected to D10; this will have to be changed to D8. Also for the libraries to work pin D8 will have to be set as an output in the 'setup()' section of your sketch. The shield also includes a large prototyping area with a 13x12 grid of 0.1" pitch PTHs.
It includes the following things that come with it: a microSD socket, red power indicator LED, and a reset button; but it does not come with headers installed. We recommend the 6 and 8-pin stackable headers.