【Technical analysis】Using RFID technology of circuit, a vehi

  Industry News     |      2014-12-31 05:53:00

RFID technology is widely used in the market.In foreign countries, the radio frequency tag is widely used in industrial automation, business automation, transportation, logistics, and many other fields.Its unique high accuracy and fast speed greatly reduces the enterprise logistics cost, improve the market competitiveness of enterprises and service efficiency.In this paper, the design of a complete intelligent control system, the garage garage model overall design scheme of using "back" word, this solution has been verified in the model of the garage and the actual information collection, can satisfy the practical application.With on STC company produces the hardware part 11 f32xe on STC microcontroller as the control core, to the overall design, system hardware and the design of hardware in the system each function module for the following details

  Garage model is divided into two parts, the lower the overall architecture part and display system of smart car parts

  Garage overall architecture design, the entire model designed fangs separate module.In this way, the garage model demonstrates the function and collecting data for the garage, easy to operate and easy to simulate a variety of scenarios, in the process of moving, reduce the volume, is advantageous for the compression space.Internal design adopts the "back" word, make the in and out of each other is not interfered with, to avoid the in and out of the vehicle road in waiting for each other in and out of the cases.The entire model structure and function in the block independent design, less in the vehicles, the parking demand is not big, can only part of the building model, can meet the demand.In densely populated, vehicles, more can scale horizontally, to build a few more modules;Can also be down, make it double, or multilayer three-dimensional garage, to meet the actual demand, increased its practicability and is convenient for later

  The design of the intelligent car, completely according to the national standard robot competition, vehicle USES the dc power supply, facilitates the management of the system of power supply and reduce the power consumption of the equipment as much as possible.Voltage chip in the power and the connection between the controller and other equipment, can make the system power supply voltage and current of what we need and can effectively protect the power supply.Use on STC 89 c58 single chip microcomputer as the simulation of the vehicle controller, can make a timely response to changes in vehicle running, the simulated driving vehicles are to go forward, to stop, back into and out of the garage operation, etc.Considering demand and cost, choose 11 f32xe on STC single-chip microprocessor as control core.11 f32xe on STC microcontroller in the system as a whole, read from the card reader module information, timely processing to obtain the information and the results back to the card, complete the information exchange

  Program download module circuit diagram is shown in figure 1, the first in the chip has not been working, PC via a serial port (DB9) to send signals to 11 f32xe chip on STC, let the chips in a state of waiting for download.When to the single chip microcomputer to electricity, computer terminals and MAX232 chip through T1OUT0 and R1IN0 connection, after conversion level, ultimately through T1OUT0 and R1IN0 connection to the target chip, through the circuit loop, complete program download.


  Download MAX232 chip in this circuit, from 1, 2, 3, 4, 5, 6 feet and 4 capacitance only produce two + 12 v and 12 v power supply, provide for the needs of the RS - 232 serial port level.By the TTL/CMOS data from T1IN, T2IN input into RS - 232 data from the T1OUT, T2OUT DB9 plug to computer;DB9 plug of RS - 232 data from R1IN, R2IN input into a TTL/CMOS data from R1OUT, R2OUT output, after finish level transformation.

Radio frequency identification module.

  Part of the circuit shown in figure 2, radio frequency identification card to enter the antenna of the magnetic field generated, after receiving the rf signal from the reader, with the energy gained by the induced current through TX1 and TX2 send product information, stored in the chip reader RC522 read the information and the decoding, by M - MFMOSI, M - MFMISO and M - 11 f32 hold MFRST sent to STC on data processing.

    MF RC522 chip USES the advanced concept of modulation and demodulation, passive under 13.56 MHz contactless communication mode and protocol.Make its internal transmitter antenna part through TX1 and TX2 drive, speaking, reading and writing and the ISO 14443 a/MIFARE card of communication.Hardware receiver part provides a strong and effective demodulation and decoding circuit, used for handling ISO14443A compatible response signal.With 11 f32xe on STC by M - MFMOSI, M - MFMISO and M - MFRST less communication USES the connection in the connection of UART (RS232) mode, data transfer rate is as high as 424 kbit/s, is beneficial to reduce the attachment, reduce the size of our PCB, reduce the cost.

Liquid crystal display module

 Display circuit as shown in figure 3, use 12864 LCD screen, using the lattice character, shows that we in the practical use in the scene for the customer and to own the same unified visual operation


  The intelligent garage design, fully consider the practicality and stability.On the extensive use of traditional garage garage and make model, data statistics and analysis on the usage of each parking on the function and structure, adopt the independent design, in the process of practical application, can according to need, on the basis of the existing models of the garage, to increase or decrease of park area according to the actual needs, in order to meet the needs of parking.In the process of program design, according to the different scenarios of magnetic card, set to multiple working mode, as far as possible to reduce the program, the mutual influence between universality and correct operation of the system