Liquid level detection method and liquid level sensor

A liquid level sensor for implementing a liquid level detection method, comprising an electronic tube, a plurality of magnetoresistive elements, a float and two magnets;

• wherein the plurality of magnetoresistive elements are longitudinally and sequentially disposed in the electronic tube;
• the float rotatably sleeves on the electronic tube;
• the two magnets are disposed on the float, and same poles of the two magnets are disposed facing to the plurality of magnetoresistive elements;
• and
• the plurality of magnetoresistive elements are equidistantly distributed, a distance between two adjacent magnetoresistive elements is L, and a length of each of the magnets is 2L;
• and
• wherein the liquid level detection method comprises forming a magnetic field by the two magnets with same poles disposed facing to each other;
• wherein a position of the magnetic field changes accordingly when a position of the float changes;
• disposing the plurality of magnetoresistive elements equidistantly for collecting magnetoresistive signals at a movement range of the float;
• and
• detecting, by two adjacent magnetoresistive elements located between the two magnets, change of a magnetic field intensity and outputting a linear detection result, when the float moves, and calculating, according to the detection result, a liquid level height value.