*) at last, fix all error, it can blink at PIN3

1) PIN13 should not to be used to blink.
2) A good moden  Android phone is needed to test the code.My Galaxy S
i9000 does not support android accessory mode at all. Sony Xperia st25
support it, but need to restart the phone
3) wifi adb is good way to test the android app. since the micro-usb
port is occupied by the USB Host Shield.
4)