Integrating Arduino with Scriptographer should not be too hard. You could even embed Arduino directly in Scriptographer, as it's based on Java just like Scriptographer. Embedding Processing would be a bit harder, as it needs a graphical interface, which currently interfers with the Illustrator interface. Future version might fix this.
But if you want to run any of these outside of Scriptographer and have a connection between the two, you could open a TCP socket between them through which you send commands, e.g. using Processing's Client / Server classes:
See you soon in Basel.