The Arduino Extreme uses many more surface mount components than previous USB Arduino boards and comes with female pin headers. Version 2 of the Arduino Extreme uses a gridded ground plane and includes the new " URL. Later NG's shipped with an ATmega168 instead of an ATmega8, though either chip can be used with any board. It also has a built-in LED on pin 13 (which may interfere with SPI communication). The Arduino NG uses the FTDI FT232RL USB-to-Serial converter, which requires fewer external components that the FT232BM. There is, however, about 1000 ohms of resistance on pin 13, so you can connect an LED without external resistor.
Revision C of the Arduino NG does not have a built-in LED on pin 13 - instead you'll see two small unused solder pads near the labels "GND" and "13". Some blue Diecimila boards say "Prototype - Limited Edition" but are in fact fully-tested production boards (the actual prototypes are red).
It also provides pin headers for the reset line and for 3.3V. A resettable polyfuse protects your computer's USB ports from shorts and surges. The Diecimila uses a low dropout voltage regulator which lowers the board's power consumption when powered by an external supply (AC/DC adapter or battery). The main change in the Arduino Diecimila is that it can be reset from the computer, without the need to physically press the reset button on the board. Note: around March 1st, 2009, the Duemilanove started to ship with the ATmega328P instead of the ATmega168. It also adds an easiest to cut trace for disabling the auto-reset, along with a solder jumper for re-enabling it. The Duemilanove automatically selects the appropriate power supply (USB or external power), eliminating the need for the power selection jumper found on previous boards. It is similar to the Duemilanove, but has a different USB-to-serial chip the ATMega8U2, and newly designed labeling to make inputs and outputs easier to identify. It can be extended with a variety of shields: custom daughter-boards with specific features. It connects to the computer with a standard USB cable and contains everything else you need to program and use the board. This is the latest revision of the basic Arduino USB board.
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