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Multifunction networked remote environmental monitoring system to solve the multi-field of environmental monitoring, span a wide variety of pollutants to be monitored, 24-hour monitoring and other issues. Using a modular design, with 32 chip LPC2214 ARM7 family doing environmental monitoring instrumentation core processor, and set aside a number of sensor interface for system upgrade later made full preparations. System versatility is reflected in the monitoring of workplace diversity, the instrument can be set to monitor mode to select any one of three modes for monitoring, including pollution, traffic junctions, residential areas and other human activities, many of these places; Network technology, the system integrates the three transmission methods are GPRS wireless transmission, Ethernet transmission, RS485 bus transfers, each sub-station according to the actual geographical location, economic conditions, etc. Select the appropriate transmission mode, eventually connected into various sub-stations a network. Remote monitoring is the monitoring results of the various sub-station transmission via either transmitted to the monitoring center environment to achieve unattended, unified management. Paper introduces the multi-network remote environmental monitoring system's overall design, and then discusses in detail the environmental monitoring instrumentation hardware circuit design and design specifications, and finally describes the monitoring center PC software design and implementation process, and the host computer screen instructions. Hardware circuit includes: CPU circuit, power supply circuit, an external watchdog and the RTC circuit, the system clock, the signal processing circuit, the buzzer circuit, communication circuit, buttons and display circuit. Environmental monitoring instrumentation to Philips LPC2214 ARM7 family microprocessor to do; signal processing circuit related to the voltage signal, the frequency signal, I2C, switch signal, parallel signal, which also uses a high-precision ADC capture chip CS5532 improve the instrument's accuracy; data display with LCD module, friendly interface; external watchdog FM33256 can achieve low-voltage monitoring, providing RTC clock, while the chip is used to store and 256k of the Flash system parameters, the design enhances the instrument anti-interference ability and stability. SCADA software programming environment for Visual Basic 6.0, and SQL Server database connections, to achieve the environmental parameters for receiving, processing, storage, display, query and other functions. System has been designed and made a high temperature, low temperature, constant humidity, static test, and also carried out more than one instrument and control center line debugging, monitoring mode to achieve three three transmission methods for monitoring and transmission system stable and reliable.
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