Adafruit 170 Starter kit ARDX - v13 ARDX ATMega328
This kit includes all the pieces needed to complete 11 different circuits, along with a experimenter's guide booklet & breadboard layout sheets. It provides the Thru-hole (THM) type Arduino Uno R3, which has an improved USB interface chip. Like the Duemilanove, it has an expanded shield header with a 3.3V reference, a RESET pin and a 500mA fuse, but an automatic circuit to select USB or DC power as well. This Uno is pin and code-compatible with the Duemilanove, Diecimilla and older Arduinos so all your shields, libraries, code will still work. The 3rd revision (R3) of the UNO has a few minor updates, with an upgrade to the USB interface chip and additional breakouts for the i2c pins and an IORef pin.