Method and device for reading rfid/uhf label based on audio interface

A method for reading RFID/UHF label based on an audio interface, comprising the following steps of:

• Step S110:
• sending a first digital signal in a triggering mode by an electronic device;
• converting the first digital signal by a software module built-in the electronic device into an analogue signal;
• sending the analogue signal to an external read-write module through a left/right earphone channel of an audio interface of the electronic device;
• Step S120:
• converting the analogue signal sent by the electronic device into a square wave signal by an audio communication circuit in the read-write module;
• inputting the square wave signal as a received baseband signal into the MCU;
• decoding the square wave signal by the MCU to recover the digital signal sent via the audio interface of the electronic device so as to generate a second digital signal;
• Step S130:
• transmitting the second digital signal to a RFID/UHF controller via a communication interface;
• enabling an internal anti-collision programming algorithm by the RFID/UHF controller to modulate and send signals of a plurality of different frequency points, wherein the signal of each frequency point forms a signal channel;
• Step S140:
• electrically connecting the RFID/UHF controller to a power amplifier PA;
• amplifying the signals of the above mentioned plurality of different frequency points by a power amplifier PA;
• then, sending the amplified signals to form an electromagnetic field and receiving radio frequency signals fed back through a plurality of labels in the electromagnetic field by an antenna transmitting and receiving module with matched impedance;
• Step S150:
• amplifying the plurality of radio frequency signals fed back by the above labels by a power amplifier PA and then transmitting the signals to the RFID/UHF controller;
• identifying and confirming the plurality of radio frequency signals transmitted at the same time and then transmitting those radio frequency signals to the MCU via the communication interface by using the anti-collision programming algorithm in the controller;
• Step S160:
• encoding the plurality of label data fed back by the RFID/UHF controller and generating a baseband signal by the MCU;
• converting the generated baseband signal by the audio communication circuit into an audio analogue signal;
• and transmitting the audio analogue signal into the electronic device via a microphone channel in the audio interface;
• Step S170:
• transmitting the audio signal received in the audio interface of the electronic device into the built-in software module, and encoding the audio signal by the built-in software module to obtain the RFID/UHF label information read by the RFID/UHF controller.