how to interface rfid with 8051


Posted on Feb 5, 2014

An RFID(Radio-frequency identification and detection) reader is a device which is used to communicate with RFID tags by receiving and transmitting signals. These signals use radio waves for wireless communication. RFID tag is applied to products, individuals or animals to identify and track them. The identification is done through a unique serial nu


how to interface rfid with 8051
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mber. This topic covers the interfacing of a passive RFID system withAT89C51. The code of RFID tag is also displayed on anLCDinterface. The free source code for the program isavailablein C. AnRFIDmodule basically consists of two parts, namely, a tag and a reader. A typical RFID system consists of an antenna, a transceiver and a transponder (RF tag). The radio frequency is read by the transceiver and the information is transferred to a device for further processing. The information (the unique serial number) to be transmitted is stored in the RF tag or transponder. The transponder contains a chip and an antenna mounted on a substrate. The chip transmits the relevant information through antenna. The antenna also receives the electromagnetic waves sent by the RFID reader. Different RFID tags work on different frequencies. Here low frequency, 125 kHz, RFID tags have been used. These tags work within a range of 10 cm. When an RFID tag comes in this range, the reader detects it and sends a unique code of the tag serially. This serial code, consisting of 12 bytes, is received by the microcontroller. A serial level converter is required forAT89C51to receive these serial signals. ICMAX232has been used for this purpose to interface the RFID reader with microcontroller. The circuit connections are as follows: Receiver1 (R1) of MAX232 has been used for the serial communication. The receiver pin of RFID reader is connected to R1IN...




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