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A water level detector that, when it senses that the water is getting low, turns on the pump, and when it senses that it gets high enough, turns the pump back off. A circuit very similar to this was published a couple of hours ago, and I decided that before I look at it, I wanted to try to make a circuit with the same function, and see what I came up with. The three resistors on the bottom-left represent the wires going into the water and the water's resistance. The hight of the wires correspond with the height of the resistors; the top resistor is the wire that goes down the least distance, and the bottom resistor is the wire that goes below the other two wires. The buttons represent the water level; if none are being pushed, then the water level is neither too high nor too low, if the bottom button is pressed, then none of the wires are connected via the water, and the pump turns on, and if the top button is pressed, then all the wires are connected via the water, and the pump turns off.
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