Last fall, we toured the Champagne region in France, famous for its sparkling wines. We explored the ancient, underground cellars where Champagne undergoes its magical transformation from grape juice to sparkling wine. These cellars, often 30 meters deep and kilometers long, maintain a constant temperature of around 10-12°C, providing the perfect conditions for aging and storing Champagne.

After sampling various Champagnes, we returned home with eight cases to store in our home's basement. However, unlike those deep cellars, our basement is just a few meters deep, prompting a simple question that sent me down a rabbit hole: how does our basement's temperature compare?

Rather than just buying a thermometer, I decided to build my own "temperature monitoring system" using open hardware and custom-built software. After all, who needs a simple solution when you can spend evenings tinkering with hardware, sensors, wires and writing your own software? Sometimes, more is more!

The basic idea is this: track the temperature and humidity of our basement every 15 minutes and send this information to a web service. This web service analyzes the data and alerts us if our basement becomes too cold or warm.

I launched this monitoring system around Christmas last year, so it's been running for nearly three months now. You can view the live temperature and historical data trends at https://dri.es/sensors. Yes, publishing our basement's temperature online is a bit quirky, but it's all in good fun.

So far, the temperature in our basement has been ideal for storing wine. However, I expect it will change during the summer months.

In this blog post, I share how I built the client that collects and sends the data, as well as the web service backend that processes and visualizes that data.  Click 'Read more' for the details.