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Practical Arduino: Cool Projects for Open Source Hardware by Jonathan Oxer, Hugh Blemings

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Chapter 12. Water Tank Depth Sensor

Water is a precious resource in many parts of the world and many people rely on water tanks to supplement their water supply by storing collected rainwater or water pumped from a well or bore. But how do you measure how full a tank is? Tanks are constructed of opaque material to prevent algae growth and are often kept closed up to prevent mosquito infestation or access by rodents, so it's inconvenient to physically look inside. And besides, having a way to measure tank depth electronically opens up a world of possibilities, such as automatic control of pumps to fill tanks when they get low or to disable irrigation systems when not enough water is available.

The obvious way to measure tank depth is by placing ...

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