//MARS R/ Re: Fw: SD Card Pix
- From: John Yost <dtjay@xxxxxxxxx>
- To: rgn3_tech@xxxxxxxxxxxxx
- Date: Fri, 17 Dec 2010 07:06:17 -0800 (PST)
Yep! It just kinda grew. Started with the cpu timer then the dtmf decoder
then
some wires for digital pots and finally some for the SD card. And, according
to
the wife, its kinda an indication of how I am-not sure what she means by that
but probably not good - hi.
Need to sit down and document the pins being used. Then implement the
parameter
file being read from the sd card - I was thinking of activating that process by
holding the ID button down during a reset - comments.
Things are settling down here now so I should be able to get back on this.
________________________________
From: J Sears <aat3ok@xxxxxxxxx>
To: rgn3_tech@xxxxxxxxxxxxx
Sent: Thu, December 16, 2010 7:57:59 PM
Subject: //MARS R/ Re: Fw: SD Card Pix
WTFO Do you have a schematic for that rats nest??????? geeze what a lot of
wires
--- 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
>
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>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.
>
>http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1206874649/8
>
>this web site shows the voltage dividers for the input pins.
>
>SRI for the long text but I needed to document this stuff somewhere
>
>JY
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