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Added Function to power down magic USB interface chip with new firmware Download firmware here http://mbed.org/users/simon/notebook/interface-powerdown/ http://mbed.org/media/uploads/simon/mbedmicrocontroller_experimentalpowerdown.if You need to power the mbed by vin or usb board such as cool components http://mbed.org/cookbook/Cool-Components-Workshop-Board Hello my name is guitar reverse me and it is karaoke time