I am using a micro sd card shield with an arduino zero, and I am not sure I am using a proper circuit with it. This is the circuit I am using right now:
I have seen a lot of schematics out there with resistors in series to the processor, some times with pull up resistors, some times with pulldown resistors...
I'm not sure the pullup resistor I am using is a good idea, and I am unsure about the value.
To me something like this makes more sense:
Can someone teach me a proper circuit for this? what is best and why?
Right now I am not very happy with the performance of the micro SD card socket. That's why I want to improve it.
EDIT: Turns out I didnt really understand very well the second schematic, it was just voltage dividers to lower the 5v os arduino uno to 3V. But what about the pullup resistor of the MISO?