Note! This is very much a work in progress. All designs are subject to change.More information can be found on my website https://breakpointer.co/projects/OpenWaterV2/ There is also a git repo that contains all the hardware, software, 3D models, and instructions on how to create your own version. https://github.com/breakpointer/OpenWaterRequirements:A easy to assemble as possible (no power tools required, soldering is okay).Opensource hardware/softwareRun remotely on battery power for a monthWaterproof/weather proofSomething that looks half-way decent when it's floating in your poolCost under $500 in partsServiceable - sensors need quarterly calibration, battery charging, component replacement, leak inspection, etc...