Stacking USB Host and SD Card Shield

Hello guys,

I am trying to stack a USB Host Shield and a SD Card Shield but it doesn't really work :frowning:
The USB Host shield I am using: USB 2.0 Host Shield Module for (For Arduino) 903309 2021 – $12.82
The SD Card shield I am using: http://www.miniinthebox.com/catalex-sd-tf-card-shield-expansion-board-for-arduino-works-with-official-arduino-boards_p1141444.html
For the SD Card shield there is zero documentation. The only thing I know that it's using pin 4 for CS.
The work individually when I put them on the bottom but the top one doesn't work.
The SD Card shield is also the only shield with ICSP passthrough header. The USB Host only has a ICSP Female.

Can somebody help me with this?
Thanks!

For the SD Card shield there is zero documentation. The only thing I know that it’s using pin 4 for CS.

Well, the fact that there needs to be a chip select pin (AKA a slave select pin) ought to tell you that the device is an SPI device. From that, you should be able to determine what other pins it uses.

Can somebody help me with this?

Did you have a Programming question? If not, why are you HERE?