Electronic device

An electronic device, comprising:

• a base forming an accommodation space;
• a rotor being received in the accommodation space of the base, the rotor being rotatably coupled to the base;
• a first magnetic body being installed in the rotor, the first magnetic body being positioned at a center of rotation of the rotor, the first magnetic body facing the base, and the first magnetic body having a first polarity;
• a second magnetic body being installed in the base, the second magnetic body facing the first magnetic body, and the second magnetic body having a second polarity;
• a first group of magnetic bodies being installed in the base, the first group of magnetic bodies being positioned around the second magnetic body;
• a third magnetic body being installed in the rotor, the third magnetic body facing at least one of the first group of magnetic bodies, and the third magnetic body being positioned around the first magnetic body;
• a hall sensor embedded in the rotor and sensing a change in magnetic field provided from the first group of magnetic bodies according to a rotation of the rotor;
• a wireless communication unit embedded in the rotor or the base;
• and
• a controller embedded in the rotor or the base and configured to transmit information obtained by the hall sensor through the wireless communication unit,
• wherein the first polarity is different from the second polarity, and
• wherein the first group of magnetic bodies includes:
• a fourth magnetic body having a fourth polarity;
• and
• a fifth magnetic body having a fifth polarity different from the fourth polarity.