Apparatus and method for measuring humidity for dryer

An apparatus for measuring humidity for a dryer, the apparatus comprising:

• a capacitance measuring sensor configured to measure an amount of capacitance change that is changed due to humidity of an object to be dried, the object having been put into the dryer, the capacitance measuring sensor having a sensing area opened in a direction of the object to be dried;
• a shield configured to shield noise generated in the dryer;
• and
• a processor electrically connected to the capacitance measuring sensor and the shield,
• wherein the processor is configured to:
• output a first signal from the capacitance measuring sensor;
• apply a second signal having a specific waveform and a specific voltage to both of the capacitance measuring sensor and the shield;
• and
• acquire the amount of capacitance change, based on the first signal that is output from the capacitance measuring sensor so as to determine an amount of humidity change of the object to be dried.