@ray wrote:

Note that firmware 2.0.6 for OpenSprinkler (not OSPi) has added support for logging onto microSD card. Please check the relevant post here:

Thanks Ray, this is helpful. I’m using OpenSprinkler fork based on 2.0.

I have a quick question for you – why there is a limit of 2GB on microSD card and FAT16? Standard Arduino SD library seems to handle well big cards (I’m using 32GB card) and FAT32 with no problems. Is it a hardware or software restriction?