Water-level measuring device using gear ratio

A water-level measuring device measuring a water level by using a gear ratio, the water-level measuring device comprising:

• a water tank filled with a water;
• a float receiving buoyancy by being floated over a water surface of the water filled in the water tank;
• a cable connected to the float and extending to the outside of the water tank;
• a first gear connected with the cable;
• a second gear connected with the first gear;
• a weight pendulum connected with the second gear and moving in up and down directions;
• and
• a water-level transmitter configured to transmit a signal according to a movement of the weight pendulum,
• wherein when the water level of the water tank descends, the weight pendulum ascends due to a weight of the float, and when the water level of the water tank ascends, the weight pendulum descends due to the buoyancy of the float,
• wherein the water-level transmitter includes:
• a housing including a space into which the weight pendulum is inserted and in which the weight pendulum is configured to move;
• an input terminal connected with the housing and configured to supply a voltage;
• and
• an output terminal connected with the housing and configured to generate a voltage according to the movement of the weight pendulum.