Using the ITEAD USB Host Shield with your Arduino is easy. First, attach the shield to your Arduino board. Make sure it's properly connected. Then, if you want to use a specific USB device like a keyboard or a PS3 controller, load the appropriate code onto your Arduino. You can find this code and more information on Itead's wiki page. When using the shield, keep in mind that it operates at 3.3/5V, so ensure your power source is compatible. Also, the shield provides a 5V/500mA supply for the USB protocol, so don't overload it with high - power devices. For maintenance, just keep the shield clean and free from dust. If you're not using it for a long time, store it in a dry place. That's all you need to know to get the most out of your ITEAD USB Host Shield.