This module was written using Adobe's Flash Builder 4.6.
It depends on the OpenExhibits SDK and the as3glue library.

Included in this project is the Firmata_RFID arduino sketch necessary for communicating the RFID readings from an Innovations ID-12 or ID-20 chip. This must be flashed onto the arduino in order for the module to be able to communicate with the as3Glue library.

Communication happens over a serial to socket bridge. Included in this module is the TinkerProxy software to perform as this bridge.

Setup consists of placing the firmware on the arduino, discovering the name of the serial port that it is using (both of these steps can be accomplished using the Arduino software).

In my case the serial port was named "/dev/cu.usbmodem411". Note this name can change based on which usb port on the same computer the arduino is plugged into.

The config file for tinkerproxy needs to be updated with the serial port name here are my settings for reference, note you will be looking in the Arduino software for the serial device that looks like "/dev/cu.usbmodem411":

# Config file for serproxy
# See serproxy's README file for documentation

# Transform newlines coming from the serial port into nils
# true (e.g. if using Flash) or false
newlines_to_nils=false

# on a mac you will need to add this
#serial_device1=/dev/tty.usbserial-A6004osh
serial_device1=/dev/cu.usbmodem411
# Comm ports used
comm_ports=1,2,3,4

# Default settings
comm_baud=115200
comm_databits=8
comm_stopbits=1
comm_parity=none

# Idle time out in seconds
timeout=300

# Port 1 settings (ttyS0)
net_port1=5331

# Port 2 settings (ttyS1)
net_port2=5332

# Port 3 settings (ttyS2)
net_port3=5333

# Port 4 settings (ttyS3)
net_port4=5334

Flash setup

Once this is running on the arduino and TinkerProxy is connecting to it, the module can be added to an OpenExhibits project as in this Main.as.
The main thing to notice is the addition of the ArduinoViewer and ArduinoToCMLMapper objects. These are responsible for the module and its Graphic interface.

I developed this project on the Arduino Mega 2560. Other Arduino boards will have different numbers of pins. You can select which pins are made active by editing the ArduinoViewer.as file directly or setting the variables from Main.as and calling arduino.initArduino(). This will select which pins are read, it is likely a performance boost to only activate the analog pins that you will actually be using. However by default I have activated all pins for my board.

package 
{
    import ArduinoViewer;

    import com.gestureworks.cml.core.CMLObjectList;
    import com.gestureworks.components.CMLDisplay;
    import com.gestureworks.core.GestureWorks;
    import com.gestureworks.core.TouchSprite;
    import com.gestureworks.events.GWGestureEvent;

    import flash.display.Loader;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.net.URLRequest;
    import flash.utils.Dictionary;

    CMLDisplay;

    [SWF(width = "1024", height = "768", backgroundColor = "0x000000", frameRate = "60")]

    public class Main extends GestureWorks
    {
        private var _viewer:ArduinoViewer;
        private var _mapper:ArduinoToCMLMapper;

        private var _globalListeners : Dictionary;

        public function Main():void 
        {
            super();
            settingsPath = "library/cml/my_application.cml";

            _globalListeners = new Dictionary();

            //Arduino viewer communicates with arduino and allows for listeners to register
            viewer = new ArduinoViewer();
            addChild(viewer);

            //Tracks mapper objects that turns arduino events into changes in CML object property
            mapper = new ArduinoToCMLMapper(viewer);
            mapper.x = 175;
            addChild(mapper);

        }

        public function get mapper():ArduinoToCMLMapper
        {
            return _mapper;
        }

        public function set mapper(value:ArduinoToCMLMapper):void
        {
            _mapper = value;
        }

        public function get viewer():ArduinoViewer
        {
            return _viewer;
        }

        public function set viewer(value:ArduinoViewer):void
        {
            _viewer = value;
        }

    }
}

Wiring up the Innovations ID12 RFID chip

The RFID chip has pins numbered from 1 to 11 as follows:

I purchased the ID-20 from sparkfun along with a breakout board for the ID-12 (which is compatiable with ID-20). I recommend this breakout

as it made attaching wires very simple even for my limited soldering abilities.

wiring a switch

http://arduino.cc/en/Tutorial/Button Digital switches require a pull down resistor so that they do not float when the switch is turned off. I used a 10Kohm resistor connected to the reading side of the switch like so:

PWR --- 10 ohm resistor --- switch --- lead to digital pin --- 10Kohm resistor --- GND

Note the 10Kohm resistor has the effect of pulling a line to GND over time, so it is called a "pull down" resistor.

wiring a potentiometer

http://arduino.cc/en/Tutorial/AnalogReadSerial Potentiometers are easy to wire. I use a 10Kohm pot and it works well with the Arduino. Potentiometers have three connectors. Usually the two outside connectors go to ground and +5V and the middle goes to an analog pin on the arduino. Which wire is connected to ground and vice versa will select whether the reading is low clockwise or counter clockwise on the potentiomter.