Arduino ATMega32u4 USB pinout
If you are talking about http://elecfreaks.com/store/download/Freaduino%20microV1.2.pdf board you can power from USB connector and use serial RX/TX 32u2' 5V serial pins. D+/- are high frequency USB data wires dedicated to USB only. You can make ugly hack, unsolder R3&amp;R10 and wire D+/- to RX/TX. But it's really really awfull reusing USB connector as 5V serial.