The Arduino USB Host Shield allows you to connect a USB device to your Arduino board. The Arduino USB Host Shield is based on the MAX3421E, which is a USB peripheral/host controller containing the digital logic and analog circuitry necessary to implement a full-speed USB peripheral or a full-/low-speed host compliant to USB specification rev 2.0.
Features
HID devices: keyboards, mice, joysticks, etc. Game controllers: Sony PS3, Nintendo Wii, Xbox360. USB to serial converters: FTDI, PL-2303, ACM, as well as certain cell phones and GPS receivers. ADK-capable Android phones and tables. Digital cameras: Canon EOS, Powershot, Nikon DSLRs and P&S, as well as generic PTP. Mass storage devices: USB sticks, memory card readers, external hard drives, etc. Bluetooth dongles.