Dryer and method of controlling the same

A dryer, comprising:

• a drum;
• a heat pump;
• a duct configured to:
• accommodate an evaporator and a condenser of the heat pump,
• heat air flowing in from the drum, and
• discharge the air to the drum;
• a first temperature sensor configured to measure a temperature of the air discharged to the drum;
• a second temperature sensor configured to measure a temperature of the air flowing in the duct from the drum;
• an electrode sensor configured to measure whether laundry accommodated in the drum is in contact in a wet state;
• and
• a controller configured to determine that drying is complete based on maintaining a difference value between the temperature of the air discharged and the temperature of the air flowing in below a preset value,
• wherein the controller is further configured to determine that the difference value is maintained below the preset value based on determining that the difference value is less than the preset value and a number of times, which an amount of change with time is less than a preset amount, is greater than or equal to a preset number of times,
• wherein, when determining the difference value, the controller is further configured to determine an amount of change with time of the difference value as an amount of change between the difference value and a minimum value among previously determined difference values, and
• wherein the controller is further configured to determine, based on a determination that the laundry is not in contact for a preset period of time based on an output value of the electrode sensor, drying is complete after a period of time corresponding to a preset ratio to a period of time of a drying process performed.