This code looks to me to be fairly well constructed. There's a nicely written Sensor class and it looks like reasonable MVC. Yes, today it might be overkill for

This code looks to me to be fairly well constructed. There's a nicely written Sensor class and it looks like reasonable MVC. Yes, today it might be overkill for such a simple application, but I contend that this will be easier to extend into something less trivial down the line. If you are a Java guy, this is an excellent example to learn some basics of dealing with sensors.