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connect the positive battery terminal to the 7805 input pin, the positive usb pin to the 7805 output pin, and connect the negative battery terminal and the usb ground pin to the 7805 ground pin.

Like the Nano, the Micro's size and male pin headers make it perfect for prototyping ... the FTDI FT232RL, which handles USB communication as the ATmega328 itself isn't capable of doing so out ...