Robot cleaner and control method thereof

A robot cleaner comprising:

• a cleaning tool assembly which cleans a floor with water;
• a capacitance measurer to measure capacitance of the cleaning tool assembly;
• and
• a controller to calculate an amount of water of the cleaning tool assembly based on the measured capacitance, and to control cleaning of the cleaning tool assembly based on the calculated amount of water.

A control method of a cleaning robot, the cleaning robot including a main body, a traveling assembly which travels about a floor while moving the main body, and a cleaning tool assembly which is rotatably coupled to the main body and which cleans the floor with water, the control method comprising:

• if a cleaning command is received, measuring capacitance of the cleaning tool assembly using a capacitance measurer;
• calculating an amount of water of the cleaning tool assembly based on the measured capacitance;
• and
• controlling traveling and cleaning of the cleaning tool assembly based on the calculated amount of water.