TrigBoardWaterDetect
From Kevin Darrah Wiki
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This is a cool project you can build with the trigBoard. Basically just an IoT water level detector. If there's a leak, flood, or even if it rains, get a push notification immediately!! Best part is that the trigBoard uses such little current, that the battery will last for a very long time.
Here's the diagram for hooking up the probe:
Make sure to set the jumpers properly, so you wake the board up when water is detected: