Our home pool is quite old and so is its equipment. I wanted to be able to monitor the temperature from inside the house, even remotely over the internet with my cellphone, and as a bonus maybe with Alexa.
This is the result, using an ESP32, Grafana and Prometheus. Code, schematics, models for 3D print available at https://github.com/jaisor/SmartPoolThermometer
![](https://jaisor.net/wp-content/uploads/2023/07/image-1024x445.png)