So I try to manage a Sauna for our members and one idea I have had for quite some time is to enable our members to see if the sauna is hot or if they need to take the car and turn on the Sauna in advance.
I want it to be a simple and robust solution. So when I found the Ruuvi family of sensors and Gateway I sensed this was the right solution.
Using a simple Linux server to create a simple UI that looks like this.
I will see if I can add a temperature sensor for the water temperature (the sauna is just by the sea here of the west coast of Sweden).