Hi all, i have a problem to use both shield on my Arduino Uno. I try this way: 1) i connect sd solo shield (https://www.amazon.it/gp/product/B06XHJTGGC/ref=ppx_yo_dt_b_asin_title_o00__o00_s00?ie=UTF8&psc=1) directly on my Usb host shield mounted on the Arduino Uno. In this way Usb host shield work but sd shield no 2) i connect usb host and sd solo shield with SPI CONNECTOR: in particular i connect pin of usb host shield (7, 8, 9, 10) and spi pin (11,12,13) after i connect sd solo shield pin (4) and spi pin (11,12,13) but in this way only sd shield works well, meanwhile, usb host shield say, in an example (USB_DESC) osc dont start. 3) i try to set pin high (or low, according to use) for the one or the second shield but i dont have any result.
I need a very good help. Thx a lot for response