Sensor MBF310 fingerprint-based anti-theft remote control design (1)

Burglar remote control is mainly used in automobiles, garage doors, security doors, interior doors, safes, access control devices, you can control the opening and closing access control devices, security mode, when the door is open, collision, illegal movement, vibration, and so when the alarm signal.

Now on the market, the fingerprint burglar remote control is first generation optical fingerprint recognition technology, just to be able to scan the surface of the finger skin (also known as "the dead skin layer"), not so deep into the DermIS layer of the surface of the finger clean degree, directly affects the recognition results. Also, if people follow your finger fingerprint alongside a fingerprint, or through the recognition system. This kind of fingerprint identification technology while the user's identity to be identified, but it is neither safe nor stable.

Scratch-living fingerprint recognizer by issuing electronic capacitive sensor signal, the signal through the fingers of electrons on the surface, arrived at the finger skin from live layer (also known as the "dermal layer"), direct read fingerprint pattern, thereby greatly improving the system's security.

Using scratch-living fingerprint recognition technology, burglar remote control on the user's fingerprint live layer acquisition, and sent to the remote control receiver and stored in the remote control receiver inside the fingerprint of a legitimate comparison. Only the match, the user can perform other operations on the remote control; otherwise, an alarm signal. Using living fingerprint recognition technology to verify the identity of users, improving system security levels, security and stability.

1 alarm remote control transmitter design

Scratch-living fingerprint burglar remote control is divided into security remote control transmitter and anti-theft r/c receiver in two parts.

Anti-theft r/c transmitter from users carry, anti-theft r/c receiver placed in to protected access control devices. Anti-theft r/c transmitter to MSP430F12X processor as the core, on scratch-living fingerprint sensor MBF310, wireless transmitter/receiver chip nRF401, parameters for configuring the chip AT93C46 working configuration, including fingerprint data reader, fingerprint data and encrypting data wireless transmission and control directives of wireless transmission, etc.

AT93C46 have 256-bit parameters configuration data that is used to transmit data for cryptographic operations; the work on the wireless transmitter nRF401.

MBF310 SPI mode selection and MSP430F12X processor SPI bus, the bus through SPI MSP430F12X MBF310 sensor working state initialization, configuration to enable FIFO interrupt SPI mode. When fingers slipped in MBF310, MBF310 fingerprint obsolete data coexist to FIFO buffer; when the FIFO buffer full when a break signal, MSP430F12X processors receive FIFO buffer full interrupt signals immediately after reading through the SPI bus MBF310 fingerprint data collection; and to read the fingerprint data and the configuration Word AT93C46 "or" Cryptography and encryption operations data through emitting out nRF401 for fingerprint acquisition, fingerprint data read, encryption, and wireless transmission and control directives wireless transmission, etc. Anti-theft r/c transmitter circuit connection diagram shown in Figure 1.

　　

Figure 1 anti-theft r/c transmitter circuit connection diagram

2 alarm remote control receiver design

Anti-theft r/c receiver by MSP430F12X processor, wireless transmitter/receiver chip nRF401, parameter configuration chip AT93C46, fingerprint template storage FM24C64, press and LEDs, and other hardware components.

When the alarm remote control receiver typical MSP430F12X processor select nRF401 receive mode for wireless to timely receiving of anti-theft r/c transmitter emission data and instructions. When it receives a fingerprint data within the used AT93C46 MSP430F12X processor, 256-bit configuration Word received encrypted fingerprint is decoded, the burglar remote control transmitter within MBF310 collected real living fingerprint data. Then put the decoded fingerprint data with the fingerprint template stored in the memory FM24C64 fingerprint template data is checked against the results if the comparison is true, indicating that have legitimate authentication, then the alarm remote control receiver can receive alarm remote control transmitter control directive (anti-theft r/c transmitter set of instructions on key press), or does not respond to alarm remote launchers instruction data. Anti-theft r/c receiver keys used to establish the fingerprint templates, led indicates the current burglar remote control receiver. Output port: 1-6 are based on remote control directive resulting output control signals. Anti-theft r/c receiver circuit connection diagram shown in Figure 2.

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