Magnetometric level sensor.
grabcad
To optimize the design, I decreased the number of parts, redesigned the floater and magnet, making it more like a precise magnetic system with Hall-effect sensor. I propose placing the chip with the sensor and required resistors for 3.6V voltage reduction in the upper part of the assembly. This allows for easy replacement of faulty components while retaining the lower assembly. The floater features thicker walls, allowing it to detect liquid level changes from 5mm to 5m. For accurate readings, install the sensor at the geometric center of the tank or in an external pipe connected to the tank's center, utilizing the communicating vessels principle.
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