??<strong>Features:</strong><br /> I2C and Serial Grove connector.<br /> Mini USB and DC Jack.<br /> Inherits all of Arduino Duemilanove&#39;s features.<br /> Compatible with Duemilanove&#39;s pin layout£¬ screw hole and dimensions.<br /> Evolved with SMD components.<br /> Improved on extensibility and convenience.<br /> <br /> <strong>Specifications:</strong> <p></p> <table bgcolor="#999999" border="0" cellpadding="3" cellspacing="1" width="98%"> <tbody> <tr> <td bgcolor="#CCCCCC">Microcontroller</td> <td bgcolor="#FFFFFF">Atmel ATmega328 (AVR 8-bit) in TQFP-32 package</td> </tr> <tr> <td bgcolor="#CCCCCC">Operating Voltage</td> <td bgcolor="#FFFFFF">5V or 3.3V (choice by slide switch)</td> </tr> <tr> <td bgcolor="#CCCCCC">Mini USB Input Voltage</td> <td bgcolor="#FFFFFF">5V. Maximum is 5.5V.</td> </tr> <tr> <td bgcolor="#CCCCCC">DC Jack Input Voltage</td> <td bgcolor="#FFFFFF">7V to 12V (lower is preferred). Maximum is 20V. If input lower than 7V and switch set to 5V£¬ then VCC at AVR is about 2V below the input.</td> </tr> <tr> <td bgcolor="#CCCCCC">Digital I/O Pins</td> <td bgcolor="#FFFFFF">14 (of which 6 provide PWM output)</td> </tr> <tr> <td bgcolor="#CCCCCC">Analog Input Pins</td> <td bgcolor="#FFFFFF">8 (of which 2 are used for I2C communication - PC4 and PC5)</td> </tr> <tr> <td bgcolor="#CCCCCC">Flash Memory</td> <td bgcolor="#FFFFFF">32KB</td> </tr> <tr> <td bgcolor="#CCCCCC">SRAM</td> <td bgcolor="#FFFFFF">2KB</td> </tr> <tr> <td bgcolor="#CCCCCC">EEPROM</td> <td bgcolor="#FFFFFF">1KB</td> </tr> <tr> <td bgcolor="#CCCCCC">Clock Speed</td> <td bgcolor="#FFFFFF">16MHz</td> </tr> </tbody> </table> <br /> LEDs:<br /> User LED with "L" label. It is connected to ATmega328P PB5/SCK pin (Digital header pin 13).<br /> Reset LED with "RST" label. It is connected to ATmega328P PC6/RESET pin. It is lite when Reset is low.<br /> Power LED with "PWR" label. It is always on. It is connected to ATmega328P VCC pin.<br /> Transmit LED with "TX" label. It is connected to FT232RL CBUS1 pin.<br /> Receive LED with "RX" label. It is connected to FT232RL CBUS0 pin.