//MARS R/ Re: Fw: SD Card Pix

  • From: J Sears <aat3ok@xxxxxxxxx>
  • To: rgn3_tech@xxxxxxxxxxxxx
  • Date: Thu, 16 Dec 2010 16:57:59 -0800 (PST)

WTFO  Do you have a schematic for that rats nest???????   geeze  what a lot of 

--- On Fri, 12/10/10, John Yost <dtjay@xxxxxxxxx> wrote:

From: John Yost <dtjay@xxxxxxxxx>
Subject: //MARS R/ Fw: SD Card Pix
To: rgn3_tech@xxxxxxxxxxxxx
Date: Friday, December 10, 2010, 12:03 PM

Didn't turn out to well but hopefully you get the idea.  This wasn't my idea, 
but I'll take the credit-HI   Google "arduino sd card" and you'll find much 
more detail and pinouts.

Was able to write and read back 100 line text file.  Since the sd card needs 
3.3 volts I put this on the mega and used a voltage divider for the 3 input 
lines to the sd card

In my set up I have the contacts toward the odd number pins and alligned with 
the socket index, the one used to make sure you put it on the floppy correctly.

Then soceket pins 7,9,11,13,15,17,19,21,23 are connected to the sd card.
Pin out becomes
sd pin  cable pin
1               9 - SS - chip select - this is actually the second pin on the 
card the first is pin 9 
 2            11 - Data In
 3            13 - Ground
 4            15 - Vcc 3.3v
 5             17 - Clock
 6             19 - Ground1 - both need to be grounded
  7            21- Data Out - does not need voltage protection/help as the 3.3v 
is enuf to trip the threshold on 5v logic
Other pins not used for SPI interface.


this web site shows the voltage dividers for the input pins.

SRI for the long text but I needed to document this stuff somewhere



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