TOP1 ARM7 core microcontroller LPC2148 Ethernet interface circuit
The embedded master module uses the LPC2148 microcontroller based on the ARM7TDMI-S core, which is highly integrated. Embedded 40kB on-chip static RAM and 512kB on-chip flash memory, on-chip integrated ADC, DAC converter, watchdog, real-time clock RTC, 2 UARTs, 2 I2C and SPI and other bus interfaces, and USB2.0 full speed interface. It is convenient to expand the USB interface, JTAG debugging interface, touch screen, less external expansion chip, and adopt ultra-small LQFP64 package, which ensures the miniaturization of the instrument. And the circuit is relatively simple, reducing the cost of development and production. The chip can achieve a working frequency of up to 60MHz, and has strong functions, which can meet the requirements of the embedded system μC/OS-II and humanized human-machine interface. All interfaces of the LPC2148 are used in this design.
Figure 2 Ethernet interface circuit diagram
The LED module uses 20 LEDs of 6 wavelengths. The multi-wavelength design makes the measurement more targeted and the measurement data is more efficient. Our design is able to measure the brightness of each LED through the CCD, and then the LPC2148 uses the point correction function to control the size of the LED current, so that the brightness between the LEDs is consistent, further improving the accuracy of the measurement. The network chip used in this design is a stand-alone Ethernet controller with an SPI interface, which occupies less I/O ports of the MCU. The CCD module mainly includes the whole machine power supply, CPLD, linear array CCD sensor, operational amplifier and high precision AD converter.
Intelligent Access Control Ethernet Interface Circuit Design
The digital security system comprehensively utilizes modern sensing technology, digital information processing technology, computer technology, multimedia technology and network technology to realize the collection, processing, transmission, display and high integration and sharing of various security information in the community. The digital security system includes three subsystems: access control, CCTV video surveillance and anti-theft alarm. Each subsystem communicates with different types of networks such as monitoring network, information network, telephone network and TV network to achieve coordinated operation and comprehensive management.
The intelligent access control system consists of a host computer, a controller, a card reader, an electric lock, a door magnet, an identification card, and an exit button. The system structure is shown in Figure 1.
Figure 1 Schematic diagram of the access control system
The working process of the access control system is: from the control center, that is, the upper computer transmits the pre-set various operating parameters to the controller via the communication interface, such as the use of personnel information, the exit/entry mode, etc., to complete the system initialization work; The controller is in a waiting state. When someone swipes the card, the card reader transmits the card number to the access controller through the standard Wiegand interface. The interrupt service program for collecting data in the controller stores the current card number, card status, current time, control mode and the like. The initialization information is compared to obtain a result of the permission or not, and the result is sent to the card reader to give an audible and visual indication to the card reader. When the comparison result is permitted, the controller drives the electronically controlled lock through the relay to exit the locked state. The overall framework of the access controller designed according to the above working process is shown in Figure 2.
Figure 2 The overall structure of the access controller
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