Electrostatic detection sensor

An electrostatic detection sensor comprising:

• a sensor body including
• a first electrode, and
• a second electrode surrounding the first electrode while being spaced from the first electrode;
• and
• a controller connected to the first electrode and the second electrode,
• wherein the controller is configured to:
• obtain a first sensed intensity corresponding to a capacitance of the sensor body while the first electrode is connected to the second electrode;
• obtain a second sensed intensity corresponding to a capacitance of the first electrode by applying a first driving voltage to the first electrode while the second electrode is grounded to a ground potential;
• obtain a third sensed intensity corresponding to a capacitance of the second electrode by applying a second driving voltage to the second electrode while the first electrode is grounded to the ground potential;
• and
• determine whether an object approaches the sensor body or not based on a first calculation value corresponding to a change of the first sensed intensity with respect to time, a second calculation value corresponding to a change of the second sensed intensity with respect to time, and a third calculation value corresponding to a change of the third sensed intensity with respect to time.