I currently am making a BOB adapter that allows you to connect optical sensors similar to the ones used in the DDR to your APEX IO port, but my next project or version I am tinkering with adding support for these type of sensors. They are non contact and sense the water level through pipes, or tank sides. You could use them as a cheap on/off flow meter on pipes (does it have water or not), use them for ATO sensors on your sump, or even put one on the outside of your skimmer cup to alert you when its full. The sensors are like $5-9 each on ebay. I will start working on a prototype now if people are interested.
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