1. SD card FAT16 or FAT32 format and interface card. 3.3 level converter V circuit to prevent damage to the SD card. 2. Hold time of the real time clock (RTC), even if there is no connection for Arduino. Securing the battery takes many years. 3. Get started quickly with the sample code and library as well as RTC and SD. Solder joint shape area, circuit or sensor. 4. The onboard controller is a 3.3V voltage reference and reliable operation of the SD card. 5. For Arduino ADK, for Duemilanove, for Diecimila for Leonardo / R3 or higher or higher. For ADK Giant R2 / low or not supported. .
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