We’ll use the Arduino microcontroller and an analog joystick to control two servos: the first one will be connected to the horizontal axis, and the second one to the vertical axis.
We also use a the Lynx B-Pan Tilt Kit (BPT-KT) to connect servos together. Check the video and imagine what kind of robots or cool stuff you could create using more devices and a lot of pacience ; )

After you have configured your Arduino board to properly work with your Flash applications you could quickly update your existent Flash or Flex games to get input from a joystick.
I have modified three prototypes, 2 cars games and 1 platform, to work with a mini-stick, spending no more than 5 minutes to update each game.

In this sample, we’ll connect a joystick to a Flex application.
Using Firmata 2.* and as3Glue library, your Arduino board can then communicate with your Flash/Flex/Air application.

In this article we’ll control a servo motor using a joystick and the microcontroller Arduino.
We’ll also set the value of a LED-2-colors in according with the stick axis.
It’s just an introduction for the next article: Arduino and Flex: connect a joystick to your application