Hi Everyone, in this post, I will show you how to prepare the Sim808 Arduino Shield to work with an SD card. The board utilizes the capability of SIM808 module for interfacing the SD card. You can prepare the Sim808 Arduino Shield for SD card interface by following these simple steps.
Things you need:
- A PC or Laptop
- Arduino Uno/Genuino or Arduino Mega
- Arduino IDE
- SD card formatted as a FAT32 partition.
Hardware Configuration:
Attach the shield to your Arduino board. Insert the SD card in the SD card slot on the top right corner of the shield. Attach a 12V power supply to the Arduino board. Now, connect Arduino to your pc.

Make sure that the switch at bottom left corner is to "MS".
Software Configuration:
Open Arduino IDE and include this library. And Open the example, "FIleStorageOperations". Upload the code to the Arduino board.
And open serial monitor to view output.
Note: In SDmode the "NET" LED stays on.
Now you are done. The Sim808 shield is prepared for interfacing SD card.
All other AT commands for SD card operations are similar to that of SIM800. You can get an idea about these commands from here.
For more details about Sim808 Shield visit our wiki here.