Self-cleaning liquid level sensor

A method of fabricating a self-cleaning sensor for determining a level of a liquid, the method comprising:

• patterning a resist on a substrate;
• partially removing a plurality of portions of a substrate from a plurality of exposed regions of the substrate creating a plurality of raised portions of the substrate around each of an outer edge of the substrate and two raised parallel portions of the substrate extending from a first raised portion of one of the outer edges of the substrate to a second raised portion of an opposite outer edge of the substrate;
• depositing a layer of hydroscopic material over the substrate;
• depositing a trench material in the plurality of portions of the substrate partially removed;
• forming a plurality of circuit lines on a top surface of the of the substrate on the two raised parallel portions of the substrate extending from the first raised portion of one of the outer edges of the substrate to the second raised portion of an opposite outer edge of the substrate, wherein the plurality of circuit lines each extend through the layer of the hydroscopic material to terminate in a first end on one of two facing interior edges of the two raised parallel portions of the substrate forming horizontally aligned pairs of circuit line terminations and each of the plurality of circuit lines terminate in a second end in a top edge of the substrate directly above the two raised parallel portions of the substrate;
• removing a top surface of each of the plurality of raised portions of the substrate, the layer of the hydroscopic material on each of the plurality of raised portions of the substrate, and a top portion of the trench material;
• partially removing a portion of the trench material from between the two raised parallel portions of the substrate extending from the first raised portion of one of the outer edges of the substrate to the second raised portion of an opposite outer edge of the substrate, wherein a thin layer of the trench material remains on a bottom surface of the substrate between the two raised parallel portions of the substrate and on each of a vertical surface of facing interior walls of the two raised parallel portions of the substrate;
• placing a float in a recessed area created from the portion of the trench material removed from between the two raised parallel portions of the substrate;
• bonding a rectangular component composed of a material used in the substrate to each top surfaces of the two raised parallel portions of the substrate extending from the first raised portion of one of the outer edges of the substrate to the second raised portion of an opposite outer edge of the substrate and to a top surface of two of the raised portions of the substrate along each of an outer edge of the substrate, wherein a plurality of dimensions of the rectangular component correspond with a plurality of outer dimensions of two raised parallel portions of the substrate;
• bonding a cap to a top surface of the substrate and each of the plurality of circuit lines that terminate in the second end in the top edge of the substrate;
• and
• bonding a component with four sides and a bottom to the outer edges of the substrate to form a reservoir.