This is a demonstration of my homemade didgeridoo controller. The controller communicates with Max/MSP via serial communication using a handmade micro controller circuit based on the ATMega 168 chip. I have it set up to control several levels of modulation, filters, delays and also trigger samples.
Here are some stills of my patch... (its a big patch so I can only fit so much into frame)
I used the Maxduino code to communicate with my micro (the ATMega 168 is conveniently the same chip used in the arduino!) Here is a link to a bunch of info on communicating your arduino to max/MSP