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Does an Arduino Uno Mega Shield SD Card ICSP SPI Exists Already?

Here is a schematic (note that the part needs to be a 74ahc125, none of the others such as the 74hc125 will do level translation which is what you need.)

The part has tristate outputs, so the enables are all tied low so the output is always enabled. What you are doing here is 5V to 3.3V level translation, but there isn’t all that much information about it available on the net for some reason. I found the 74ahc (only some parts in the series though) explaination in a TI application note on level translation. There are also other level translator chips available but this one is cheap and easy for this application.

Peter


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