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Author Topic: Simple logic level convertor for SD card interface?  (Read 1633 times)
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I realize that I will need to provide my SD card socket with a robust 3.3v power supply, but will this logic level converter handle the SPI comms between my uno and the SD card?

http://www.sparkfun.com/products/8745

Also, how is it different than a substantially more expensive I2C level shifter?
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Also, how is it different than a substantially more expensive I2C level shifter?

This device is just a basic voltage level translater. One channel for 5v to 3.3 and one for 3.3 to 5v.

Each I2C channel must be bidirectional, a more complicated task, as data goes both directions at different times on both the data and clock channels.


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You only need 6 resistors to interface an Uno and an SD card in SPI mode.

See http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1206874649/8

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resistor dividers can be made to work, but a 74hc4050n is far easier to use, and far, far more reliable.
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