Hotel room card principle-

Hotel room card is a kind of RFID technology, which is used to control, detect and track objects. The system consists of an interrogator (or reader) and many transponders (or tags). At present, RFID technology is widely used, such as library, access control system, food safety traceability and so on.

The basic working principle of RFID technology is not complicated: after the tag enters the magnetic field, it receives the RF signal sent by the reader, and sends out the product information (passive tag, passive tag) stored in the chip with the energy obtained by the induced current, or the tag actively sends out a signal with a certain frequency (active tag, active tag or active tag), and the reader reads and decodes the information and sends it to the central information system for relevant data processing.