Pins required on USB Host Shield,

Other Hardware Hardware Development
1

Hi all,

I have mount an Usb Host Shield over my Arduino UNO, but now I have not any pin available.
Which pins are required and which are not?

How I can now to connect an simple leds?

2

I have mount an Usb Host Shield over my Arduino UNO, but now I have not any pin available.
Which pins are required and which are not?

Which USB Host shield?

This one:

says:

A four-wire serial interface is used to communicate with the host controller chip, so the shield connects the Arduino's hardware SPI pins (D10-13) to the MAX3421E.

3

yes, this is the model, thank you very much.