Thanks for the information about how to communicate from Arduino to max/msp. I have had success with digital and analog input but now I want to send messages back out to Arduino from Max.
For instance, I have a counter object tracking the amount of time someone stands on a floor switch. I want to set off a piezo buzzer if the person stands there for a certain length of time. How would I program the patch to trigger a digital pin on the Arduino high or low?
Any suggestions would be greatly appreciated!