Print as many holders as you have bars.
See pictures for assembly.
ULN2003 on the breadboard (see assembly diagram)
Upload .pde file to your Arduino board.
Install and configure a server proxy (for communication between Arduino and Flash)
Serproxy and Tinkerproxy included in software pack for OS 10.5 and 10.6. Equivalent available for all platform on http://arduino.cc
In your proxy server config file find the line containing "serial_device1" and give the identifier of your board
Launch server proxy.
Open index.html with your browser, or Arduino_xylobot.swf with standalone Flash Player (add trusted location when prompted).
Can be used as: