This PCB is part of a project to make an Internet of Things (IoT) water leak detector. Complete instructions to build the project can be found at:
https://github.com/TeamPracticalProjects/WaterLeakSensor
We'd enjoy hearing from anyone who builds this project. We also welcome collaborators!
This project is also the basis of an easy to use IoT sensor platform - we've done most of the work for you. You could attach a different sensor (perhaps a door open reed switch) and use this project to get alerts on your smartphone.