I am a new returning railroader. I was in the hobby 30+ years ago. I am armpit deep into the research to get back in. I am looking with great interest at DCC++. My only stopping point so far is finding the specified Motor shield. I am very familiar with the Arduino from another long running project. I have several motor controllers such as the adafruit v2. Is the R3 the only one that will work? I have sent the last 2 days searching the answer for this question. I just found this site so maybe my searching is not as good as I think it is. Open to all comments. I will introduce myself in the proper thread.