The Nano V3.1 is a small, complete, and breadboard-friendly board based on the ( Nano 3.0) or ATmega168 ( Nano 2.x).It have an integrated on-board USB. As the function, It has all the analog and digital pins that the or Duemilanove has and the same function as Duemilanove or .As an upgrade version of for Nano, This Nano V3.1 is 100% compatible to Nano and and IDEs. On the hardware part, remarkable changes are taken to the flexibility and experience.Power OK red LED, Green (TX), green () and green (L) LED. Upgraded 5V voltage sourcing, more drive capability. Mini-B USB for programming and serial monitor, TX& breakout for application as USB-UART convertor. Surface-Mount ICSP headerStandard 2.54mm spacing DIP (breadboard friendly)Microcontroller: . Operating Voltage( level): 5VColor as shownMaterial:PC+MetalInput Voltage(recommended): 7-12 VInput Voltage(limits): 6-20 VDigital I/O Pins: 14 (of which 6 PWM output)Analog Input Pins: 8DC Current per I/O Pin: 40 mAFlash Memory: 16 KB (ATmega168) or 32 KB () of which 2 KB used by bootloaderSRAM: 1 KB (ATmega168) or 2 KB ()EEPROM: 512 bytes (ATmega168) or 1 KB ()Clock Speed: 16 MHzDimension: 0.73 inch x 1.70 inchPowerThe for Nano can be powered via the Mini-B USB connection, 6-20V unregulated external power supply (pin 30), or 5V regulated externalpower supply (pin 27). The power source is automatically to the highest voltage source. The FT232RL chip on the Nano is only powered if the board is being powered over USB. As a , when running on external (non-USB) power, the 3.3V output (which is supplied by the chip) is and the and TX LEDs will flicker if digital pins 0 or 1 are high.MemoryThe ATmega168 has 16 KB of flash memory for storing code (of which 2KB is used for the bootloader); the has 32 KB, (also with 2 KBused for the bootloader). The ATmega168 has 1 KB of SRAM and 512 bytesof EEPROM (which can be read and written with the EEPROM library); the has 2 KB of SRAM and 1 KB of EEPROM.Package Contents:1 x Development Board1 x cableOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.