2012 Hight qualiy UNO R3 MEGA328P ATMEGA16U2 development board microcontroller Board USB Cable 100% ... , this pinexpansion board just told the onboard voltage (such as UNO 5V, can be seen as the power pins copy, does ... is a service of the USB interface chip, theoretically It UNO can simulate USB the HID, such as MIDI / Joystick / Keyboard ...