An anti-theft remote controller suitable for various access control occasions is designed, which has the functions of living fingerprint identification, RF wireless remote control, wireless encrypted data transmission, wireless encrypted command control and so on. The system takes 16 bit msp430f12x processor as the data processing and control core, which improves the intelligent level and control ability of the system.

  Theft deterrent remote transmitter module

The scraping living fingerprint identification anti-theft remote controller is divided into two parts: anti-theft remote control transmitter and anti-theft remote control receiver. The anti-theft remote control transmitter is carried by the user, and the anti-theft remote control receiver is placed in the access control equipment to be protected. The anti-theft remote control transmitter takes msp430f12x processor as the core to configure the working state of scraping living fingerprint sensor mbf310, wireless transmitting / receiving chip nRF401, parameter configuration chip AT93c46, including fingerprint data reading, wireless transmission of fingerprint data and encrypted data, and wireless transmission of control instructions.

256 bit parameter configuration data is saved in AT93c46 for encrypting the transmitted data; NRF401 operates in wireless transmission mode. Mbf310 selects SPI working mode to connect with SPI bus of msp430f12x processor. Msp430f12x initializes the working state of mbf310 sensor through SPI bus and is configured as SPI mode to enable FIFO interrupt. When the finger slides on mbf310, mbf310 collects fingerprint data and coexists it in FIFO buffer; When the FIFO buffer is full, an interrupt signal is generated. After receiving the FIFO buffer full interrupt signal, msp430f12x processor immediately reads the fingerprint data collected by mbf310 through SPI bus; The read fingerprint data and the configuration word in AT93c46 are encrypted by “or” operation, and the encrypted data is transmitted through nRF401, so as to realize the functions of fingerprint acquisition, fingerprint data reading, encryption and wireless transmission, as well as wireless transmission of control instructions. The circuit connection diagram of anti-theft remote control transmitter is shown in Figure 1.

  Circuit diagram (27): circuit diagram of anti-theft remote controller with fingerprint identification sensor

Fig. 1 circuit connection diagram of anti-theft remote control transmitter

   Anti theft remote receiver module

The anti-theft remote control receiver is composed of msp430f12x processor, wireless transmitting / receiving chip nRF401, parameter configuration chip AT93c46, fingerprint template memory FM24C64, keys, indicator lights and other hardware. When the anti-theft remote control receiver works normally, msp430f12x processor selects nRF401 as the wireless receiving mode to timely receive the data and instructions transmitted by the anti-theft remote control transmitter. When receiving fingerprint data, msp430f12x processor decodes the received encrypted fingerprint with 256 bit configuration word in AT93c46 to obtain the real living fingerprint data collected by mbf310 in anti-theft remote control transmitter. Then compare the decoded fingerprint data with the fingerprint template data pre stored in the fingerprint template memory FM24C64. If the comparison result is true, it indicates that the legal identity is verified, then the anti-theft remote control receiver can receive the control command of the anti-theft remote control transmitter (the command set by the key on the anti-theft remote control transmitter), Otherwise, it will not respond to the command data transmitted by the anti-theft remote control transmitter. The key of anti-theft remote control receiver is used to establish fingerprint template, and the indicator light indicates the current working state of anti-theft remote control receiver. Output ports 1 to 6 are output control signals generated according to remote control commands. The circuit connection diagram of anti-theft remote control receiver is shown in Figure 2.

  Circuit diagram (27): circuit diagram of anti-theft remote controller with fingerprint identification sensor

Fig. 2 circuit connection diagram of anti-theft remote control receiver


Comments and analysis of technical editor of electronic enthusiast network:

The anti-theft remote control transmitter designed in this paper adopts the scraping living fingerprint identification chip mbf310, which belongs to the second generation fingerprint identification technology. It effectively overcomes the shortcomings and shortcomings of the first generation fingerprint identification technology, such as low identification rate and rubber molded fingerprint identification, and improves the security level and correct identification rate. NRF401 wireless transceiver chip adopts FSK technology, and the remote control distance can reach 800 m. In the anti-theft remote control transmitter and anti-theft remote control receiver, AT93c46 is a codec configuration chip, which stores 256 bit codec data. The 256 bit encoding encryption algorithm is adopted when the remote control transmitter transmits data, which can prevent the data transmitted by the remote control from being intercepted and cracked and the remote control transmitter from being imitated. The remote control operation can be carried out only when the encoding and decoding data of the remote control transmitter and the remote control receiver are the same, which improves the security level. The fingerprint template memory in the anti-theft remote control receiver adopts 8 KB high-speed ferroelectric memory FM24C64, which can be read and written for 1010 times without fault. In case of power failure, the data will not be lost for 10 years. The remote control transmitter and receiver take the ultra-low power 16 bit processor msp430f12x as the data processing and control core, which improves the data operation speed and the intelligence of the system and reduces the power consumption.



If you have any questions, please discuss them in the comments section.



——Electronic enthusiast network sorting, reprint, please indicate the source!

Leave a Reply

Your email address will not be published. Required fields are marked *