The Atmel STK500 EVB is one of the most incredible starter kit development system features ISP and high voltage programming (HVP) for all AVR devices, which it can be either directly or through extension boards. Most of the time, the board is fitted with DIP sockets for all AVRs that available in DIP packages!
Today, you’ll have the opportunity to see and learn how to configure an Atmel STK500 as an Arduino-based development system board. You must be wondered, “Why you have to use the STK500 instead of a real Arduino PCB?” Well, no one said you could not use it here, unless you already had it and the board carries eight switches, eight LEDs and a variable, software programmable AREF voltage as well as a variable power supply!
When you’ve done with this project, you will have an STK500 running Arduino with the added advantage of pushbutton, LEDs on board, variable power supply and variable Analog Reference (AREF).
Note: You must pay attention that the AREF short pin must be carefully inserted when the on-board voltage reference is to be used or you can remove the short otherwise! The Analog Reference Voltage can be easily controlled with the “Connect” dialog box.
http://www.embedds.com/the-atmel-stk500-evb-the-marvelous-component-for-arduino-development-board/