This isn't a product per-say, but an accomplishment in the "finish a project, no matter how small" category. Our house is heated by a combination of wood stove and electric blowers and the inside temperature varies quite a lot. I was curious about the nature of those variations, so I built a mechanism to record and report on them. My plan is gather a year's worth of data and see if any interesting patterns emerge.
I also used this opportunity to apply some ES6 for the first time - lambda syntax, interpolation, and Promises.
Future work includes downloading local outside temperature data (e.g. for NWS or NOAA) and charting it as a comparison.