I was interested in temperature, humidity monitoring around the house to see if there were any trends, or if the basement was getting too humid. In particular, looking for a low-effort way to get data into a dashboard, I was eager to try out the AdafruitIO framework. They limit you to two managed whippersnapper devices (but you can have more using your IO key), and 10 feeds (this is the real limiter, with each stream of data being one feed).