... o platform , compared with the prior version of USB Arduino Diecimila , Arduino Nano in size accounted ... output port TX , RX, D2 ~~ D132.8 analog input ports A0 ~ A7Of 3.1 pairs TTL level ... D6, D9, D10, D115. Atmel Atmega328P-AU microcontroller6 USB download and power7. Support for external 5V ~ 12V DC ... powered9 support ISP download10 three power supply : USB , VIN, external 5V input Packing 1 has ...