PIR sensing with Max/MSP

Hey, I've searched the forums and couldn't find exactly what I was looking for.
I'm using an Arduino Uno with the PIR setup from: Make: Projects (minus the piezo).
Is this setup efficient enough to read HIGH/LOW from pin number 2 in something like Maxuino/Arduino2Max?
Do I have to blend both the PIR code (Arduino Playground - HomePage) with the Firmata code to execute this? Or can I use just the Firmata?

Any help would be great!