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Topic: SD card read/write with Arduino (Read 111 times) previous topic - next topic


minimally different ones - i have used 3.3k and 1.6k, it still worked.
Believe me, Mike, I calculated the odds of this succeeding against the odds I was doing something incredibly stupid[ch8230] and I went ahead


Feb 19, 2009, 11:45 am Last Edit: Feb 19, 2009, 11:49 am by sirmorris Reason: 1
The voltage requirements at the MMC card inputs (MOSI, CLK, /SS) are defined in the MMC card product manual:

VDD in this case must be between 2.7 and 3.6v.

Input HIGH voltage:
min:  0.625 * VDD
max:  VDD + 0.3

Input LOW voltage:
min:  VSS - 0.3
max:  0.25 * VDD

As long as the voltage tapped off the divider falls within this range, all should be well.

The document to read is here:


I've summarised all of this good stuff in a new thread:


I'm sure I've missed something :P



I had struggled with the DOSonCHIP module for a week or so. I stumbled upon this thread and uFAT2 solved all of my problems. Thanks to everyone who posted.


Just tried to download the library file on a Linux box using Firefox, and MediaFire promptly threw up by telling me to either sign in or use a supported browser (Internet Exploder?).

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