Hello, first post here as a PD newbie (but Max veteran) 
I have managed to get PD working on my RPi3 (well that was easy as it is included in the Rasbian repository!!) and I am currently installing PD-l2Ork. I hate to ask stuff without having had a good stab at it myself already but I just wanted to ask for tips on getting sensor information into PD.
I am going to take part in Tiree Tech Wave in a couple of weeks and I want to make some kind of reactive bio feedback sample player, trying to scrub local weather data looks like it might be quite hard so I thought of doing something a little more micro scale and use something like the DHT-22 to get local ambient data and to influence a generative system that plays back samples from file.
I am fairly competant with Arduino style C and have done a little work in Python (but Python does give me a headache!!) - I have managed to get DHT-22 collecting and feeding back data on the RPi with Python and on the Arduino individually. I have no idea right now how to go about getting that data into PD...
The DHT-22 has a basic microprocessor on it that sends the collected ambient readings as words on a single wire data line, People have made nice Arduino and Python libraries already to handle that painlessly...
I have installed pd-comport and I have the impression the PD-l2Ork has some good included GPIO handling, I think that what I could do quite easily right now is bring an Arduino along as well and get the Arduino to handle all the DHT-22 stuff, and also react to the data - this could result in something like triggers activating on several GPIO pins, all easy stuff. But it would be nicer and I would learn more if I could send the actual numbers based on temperature and humidity to PD and do stuff there... I have no idea how easy that would be, in Max/MSP I would use the serial object to get data from the Arduino, and it's pretty easy to filter what you see at either end.
I guess another possible benefit of serial is perhaps using Bluetooth and having the sensor located more remotely.
Of course, it's probably totally unnecessary to use an Arduino and it can all be handled by the RPi but using Python makes my blood pressure go up 
Anyway, woops I have written an essay... any thoughts, tips or words of encouragement would be welcomed!
