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Do you use the SD card as storage for the software, or doesn't it need any? I considered using one for the same purpose, but the SD was both too slow and unreliable to use even to store just a few hundred MBs.


I don't store much data in them, but have an API that they talk to and pass data around as JSON. Like so:

request --[JSON]-- > | RPi magic | response --[JSON]--> DB




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