Measure the voltage at fake SD with 3DS on.
DAT3 = 3.27v
CMD= 3.27v
CLK= 0v
DAT0 = 3.27v
Measure the voltage at fake SD with 3DS on + SD Shield + Arduino off.
CLK = 13- 0v
DAT0 / MISO = 12- 0v
CMD / MOSI = 11- 0v
DAT3 / CS/SS = 10- 3.27v
DAT3 = 3.27v
CMD= 3.27v
CLK= 0v
DAT0 = 3.27v
Measure the voltage at fake SD with 3DS on + SD Shield + Arduino off.
CLK = 13- 0v
DAT0 / MISO = 12- 0v
CMD / MOSI = 11- 0v
DAT3 / CS/SS = 10- 3.27v