A LoRaWAN pressure probe on a gas wellhead reports every 20 minutes to a self-hosted Prometheus and Grafana stack, showing exactly how the well recovers between draws. Here is how to build it.

Water on the sensor's rope pages a phone in about 25 seconds and gets announced out loud in the house. Here is how to build it on a self-hosted LoRaWAN and Prometheus stack.

I run my place off an underground cistern, and a dry run can boil the pump and flood the basement. Here is the whole chain that put the tank on a dashboard, from the 4-20mA probe to the gallons reading on my phone.