Can pins on stacked USB Host Shield on Arduino be used like it's Arduino's pins? - Microcontrollers - Arduino Forum
Electronics FAQ
Arduino USB Host Zusatzplatine – Stefan's WebBlog
Is it possible to use the Arduino read a file stored inside a USB flash drive to allow a specific action to happen? If it is what type of Arduino to use? -
Mass Storage Support for USB Host Shield 2.0 Library (Easy Guide) - Circuits At Home