Before we delve into interfacing, let’s have a basic understanding of what an SD card is, how it is organized, different forms and pinouts of it. What we’re going to do here is to interface a microSD card with an Arduino Uno using the SdFdat library developed by William Greiman and it is based on the Simplified SD Card Specification. A simplified version (it isn’t that simple) of the SD card specification is available for the public on the SD Card Association’s website. Most of the documents are confidential and are only available to manufacturers and software companies. They standardize and publish the necessary specifications to manufacture and implement SD cards. The Secure Digital (SD) standard is maintained by the SD Card Association. You could understand it just by reading the SD card spec sheet. SD cards and USB flash drives have become indispensable things in our everyday life.Įven though you could insert an SD card in your phone or computer easily and browse all your files, hardware interfacing an SD card of any type with Arduino or similar development boards is not that easy. Portable version flash memory is available as SD cards, in many capacities and form-factors. The EEPROM memory of all available microcontrollers is limited in size. There will be times when you have to store a large amount of log data and other information for your Arduino project, for example, a GPS logger.
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