lin91957
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 Posted: Sun 6:06, 10 Apr 2011 Post subject: mbt schoenen GPRS- based Acquisition System of Met |
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GPRS-based acquisition system meteorological factors
Signal. The wind module, the module rainfall, temperature modules and master modules exchange data through the I2C serial bus to receive control commands, and visibility, road conditions, such as intelligent sensors and communication modules via RS-232 serial interface to transfer data. Acquisition system using bus technology makes the system simple, reliable, low power consumption, portability. Figure 2 shows the acquisition, communication interface module block diagram. 2.1 The main control module control module responsible for data storage,[link widoczny dla zalogowanych], processing and transmission, to each memory module, collection module, communication module provides data bus and control interfaces. MSP430F449 microcontroller microprocessors, Flash is an excellent ultra-low power microcontroller, ultra low-power mode support is very suitable place wild. UART built-in module provides two digital sensor interface. MSP430 through UARTl GPRs directly connected to the wireless module, to achieve the GPRS wireless data transceiver module initialization and features, while the standard MAX232 serial interface UART2 extended with other intelligent sensors for data exchange. I2C bus to have good scalability, a simple communication protocol and the support of many peripheral devices are widely used,[link widoczny dla zalogowanych], MSP430F449 read through the I2C-bus data acquisition. 2.2 The core of the sensor acquisition module for the wind speed and direction, temperature and rainfall data using I2C bus to read, but by the smart sensor module consisting of visibility and road conditions due to RS-232 interface, the system used to spread soil mining mane most soil system performance wireless weather monitoring system in Figure 1 Figure 2 Topology overall hardware block diagram of RS acquisition system for a 232 to transmit data. Visibility by scattering-type visibility meter module, compatible with a variety of communications data in real-time measurement of long-distance transmission. Measuring range: 10 ~ 20000m, precision: ≤ 1000m time,[link widoczny dla zalogowanych], ± l0% l> lO00m time, ± 20%,[link widoczny dla zalogowanych], communication with RS232, R $ 485, GPRS and so on. Intelligent traffic modules Lufft Company pavement sensors IRS21, the sensor measures the road surface temperature; road deep temperature; Road area of water, ice or snow, residual salt, freezing temperature; low power consumption, the signal can be RS232/485 output. 2.3 the acquisition in part through the communication module GPRS to communicate with the host computer. Using GPRS for data transmission has the following characteristics: (1) access a wide range. (2) transfer rate, the actual rate of up to 50kbps, fully meet the automatic weather station data. (3) The access time is short, quick links, this is the timeliness of communication stations to provide a guarantee. (4) Currently, GPRS service is based on traffic charges. To send or receive data only when the occupation of wireless resources,[link widoczny dla zalogowanych], linked to the Internet users do not even charge. Is a more economical means of communication. The MSP430F449 has two UART, which constitutes a serial port can use GPRS communication module and the master module. The use of another UART and serial port expansion of the two smart sensor chip to achieve the communication with the master module. 2.4 Power Module Power module for the module not only power, but also provides power for a variety of sensors, designed as a modular unit. Can make use of the highway to supply power lines, where some conditions are not met can be solar powered. 3 Conclusion In this paper the design of the meteorological monitoring system uses low power factor MSP430 microcontrollers and smart sensors as the acquisition system. Using GPRS network, automatic monitoring of meteorological elements. Real-time transmission of data to the data center, through appropriate software to achieve real-time monitoring of weather conditions, in inclement weather, through the Internet or electronic display boards and other forms of distribution of meteorological information, can greatly enhance road safety operation level.
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