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Some data sheets and libraries for different arduino boards and other electronic components.
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arduino-boards/shields/Data Logger Shield mSD/mSD_Shield Library/README.md

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mSD-Shield

Schematics

The schematics can be found here.

Examples

Examples can be found in the Arduino IDE under File -> Examples -> mSD_Shield and File -> Examples -> SD.

mSD-Shield + Ethernet-Shield

If using the Ethernet-Shield together with the mSD-Shield, this must be initialized before using the SD-Card. Because otherwise the W5100 Ethernet controller blocks the SPI interface.

mSD-Shield v2

The mSD-Shield v2 uses the ICSP connector for the SPI signals and so all Arduino boards can be used.

mSD-Shield v1 (not mSD-Shield Mega-Edition)

For Hardware-SPI support on Mega boards connect the mSD-Shield v1 as follows. No Software changes are required.

     Mega   mSD-Shield v1
SCK   52   ->   13
MOSI  51   ->   11
MISO  50   ->   12

For using the RTC on Mega boards the I2C pins have to be changed.

    Mega   mSD-Shield v1
SDA  20   ->   A4
SCL  21   ->   A5