I have a arduino duemilanova (5 volt standard stuff), and I bought the seeeduino SD shield (http://www.seeedstudio.com/depot/sd-card-shield-for-arduino-v21-p-492.html?cPath=35
). Was thinking I had been taken for a ride till I found that the last SD card of a whole stack of SD cards, worked (a cheap 2 gig generic SD from microcenter). The SD micros didn't work, and of course it says that SDHC is not happening. It is particular.
Anyway. in the demo code, change pin 8 to pin 9, and it will work with either switch setting (3.3v or pin 9), that is if you:
- make sure you have formatted the card to fat16
- place file on the card called "data.log" (it's what the author uses)
- make sure you open that empty file and add a single digit or character
- and find the right SD card...
Then just type 'W' or 'T' and it actually works! Although at a glacial pace. Does anyone have any clues on speeding this up? And, I too am interested in the Arduino Mega experiences (your post, TABr is not terribly helpful).
By the way, this shield covers up the VCC and all gnds. You can still get to a +5 and a gnd using the ICSP pinout. Pin 2 is +5v and pin 6 is ground (1 is marked).