Device and method for controlling faucet, and faucet

A device for controlling a faucet, comprising:

• an input unit configured to receive a desired temperature of discharged water from a user;
• a first temperature sensor and a second temperature sensor configured to measure temperatures of hot water and cold water supplied from a hot water pipe and a cold water pipe, respectively;
• a heating tank including a heater provided therein, the heating tank configured to heat the hot water supplied from the hot water pipe by the heater, store the heated hot water, and supply the heated hot water;
• a third temperature sensor configured to measure a temperature of water in the heating tank;
• an electronic valve including a plurality of inlets connected respectively to the heating tank, the hot water pipe and the cold water pipe, the electronic valve configured to select two among the heated hot water, the hot water, and the cold water as mixture target supply water and to adjust a mixing ratio thereof, and to discharge the discharged water at the desired temperature input from the user through a discharge pipe;
• a fourth temperature sensor configured to measure the temperature of the discharged water discharged from the electronic valve;
• a flow rate sensor configured to measure a flow rate of the discharged water discharged through the discharge pipe of the electronic valve;
• and
• a controller operatively connected to the input unit, the temperature sensors, the heater, and the electronic valve, the controller being configured to control operation of the heater based on the temperature of the heated water, and to control the electronic valve based on the desired temperature received from the user unit and the temperature of the discharged water such that a difference between the temperature of the discharged water and the desired temperature is maintained within a predetermined range, wherein the control of the electronic valve includes repeatedly adjusting the mixing ratio of the selected mixture target supply water based on the temperature of the discharged water measured by the fourth temperature sensor and the desired temperature, or reselecting the mixture target supply water and adjusting a mixing ratio thereof.