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Author Topic: Volatge protection for 3.3V device.  (Read 1590 times)
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Pittsburgh, PA, USA
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I've requested they made a dual or quad SD module. You can only have 1 file open at a time per card so at least 2 to do both read and write with only 1 open and 1 close each should be faster?
But I've written enough software to think that 4 is a better if you deal with data.

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I find it harder to express logic in English than in Code.
Sometimes an example says more than many times as many words.

Lormaison
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For information ... for all practical purposes...

http://forum.arduino.cc/index.php?topic=125710.0

The same post in English at        http://arduino.cc/forum/index.php/topic,125973.new.html#new

 smiley-wink
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The LC boards worked fine for me though Terry King hinted that they're marginal in a long term bad way.
I used the SPI library and the SDFat library, though the SD library worked fine too.

I made them work using IDE 0022 (only updated maybe less than a year ago, now at 1.05) and have had
no need to use one since.

The Examples in my IDE, under SD have code that worked for me. The code was the simple part.

I'm not sure that I should use my LC modules (cheaper in quantity) at all. I can make better voltage levelers anyway.
I've got it down to 5 resistors and 3 diodes in theory for VCC, MOSI, SCK amd SS. MISO and GND need no leveling.

The reason to have multiple cards is speed not lost on constant initialization on card deselect->select. It's major.
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I find it harder to express logic in English than in Code.
Sometimes an example says more than many times as many words.

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