The USB Host Shield contains all of the digital logic and analog circuitry necessary to implement a full-speed USB peripheral/host controller with your Arduino. This means you could use your Arduino to interface with and control any USB slave device — thumbdrives, digital cameras, bluetooth dongles, etc.
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. A USB type A female connector is wired up to the IC, and it also supplies 5V as any normal USB port would.
The Host Shield takes its power from the Vin pin on your Arduino. Power from that pin is regulated to both 5V and 3.3V on the shield. All SPI signals are sent through a hex converter to step them down to 3.3V.
Note: This board does not ship with headers; you must purchase and solder headers before you will be able to attach this shield to your Arduino. See the options below for compatible headers that you can use.
Circuits@Home USB Library Compatibility Issue This board was designed before the popular USB Library from Circuits@Home was released, so it is not compatible out of the box. You must short pin D7 to the Reset pin if you want to use that library (which can be downloaded from the Developer's Site link below).
Arduino USB Host Shield Resources
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