The Design Of Multifunction Network Remote Environment Monitoring System

Multifunction and network remote environmental monitoring system has Solved these problems that the environmental monitoring have many areas, the span is broad,the amount of pollutants to be monitored is great and 24-hour monitoring. This system has adopt modularization to design, make 32-bit ARM7 LPC2214 chip do the core processor of environmental monitoring instrument,the system has reserved many sensor interfaces,made sufficient preparation for the system upgrade .The versatility of system is reflected in the diversity of the monitoring sites, you can set the monitor mode of the instrument to select any one of three modes to monitor, the monitor modes including pollution source, traffic junctions, residential area , these place people often active; network, the system integrated three types of transmission: GPRS wireless communication, Ethernet, RS485 bus transmission, sub-stations can choose the appropriate transmission mode based on the actual geographic location, economic conditions, etc. eventually made various sub-stations connected into a network. Remote monitoring is made the monitoring results of the various sub-station transmit to the environmental monitoring center by any transmission mode, realized unattended and unified administration.Paper first introduces the overall design of the multifunction and network remote environmental monitoring system, and discussed in detail the hardware circuit design and circuit design description of environmental monitoring instrument,finally described the host computer software's design and implementation of the monitoring center, as well as the server interface instructions.Hardware includes: CPU circuit, power circuit, the external watchdog and the RTC circuit, system clock, the signal processing circuit, buzzer circuits, communication circuits, button and display circuit. Environmental monitoring instrument made the Philips ARM7 series LPC2214 do the microprocessor; Signal processing circuits involved in the voltage signal, frequency signal, I2C, switch signal, the parallel signals, which also used high-precision ADC acquisition chip CS5532 improve the precision of the instrument;The display of data using liquid crystal display module, the interface is friendly; The external watchdog FM33256 to achieve low-voltage monitoring, to provide RTC clock ,at the same time there are 256k of FLASH used to store system parameters, the design enhanced the instrument's anti-jamming capability and stability.Sever monitoring software programming environment is Visual Basic6.0, and connect with the SQL Server database to achieve the environmental parameters'receiving, processing, storage, display, query and other functions.The system has been designed, and made the tests of high temperature, low temperature, constant humidity, electromagnetic interference, but also made more than one instrument and the monitoring center online debugging, it realize the three modes of monitoring and the three kinds of transmission,the system is stable and reliable.