Wireless Temperature And Humidity Monitoring System Based On Zigbee Technology

This article discusses the use of ZigBee wireless technology design anddevelopment of temperature and humidity monitoring system of work and workprocesses. The system is capable of multiple measurement points for24hoursreal-time monitoring, managers in the control room for site information. Whentemperature and humidity exceeds the set index, the system automatically sound andlight alarm, and displayed on a PC machine out of the specific area of temperature andhumidity data in real time. Staff can remotely control, thus making the sitemanagement automation, intelligent.Main content of this article:The First, Hardware structure, temperature and humidity monitoring system1. Working principleThis system is mainly constituted by the Coordinator, routers and terminal nodes,ZigBee network coordinator is responsible for, enable data transfers between theterminal nodes and PC; Terminal node is responsible for collecting, storing, uploadingthe data of temperature and humidity; Router is responsible for forwarding theterminal node of temperature and humidity data collected. Coordinator through theRS232serial port connected to the PC. PC monitor machine design and developmentset interface terminal nodes. When a region need to measure temperature andhumidity data in real time, and is located in the region of more than one terminal nodesends the data to the Coordinator. Coordinator to complete data integration, through aseries of oral transmission to PC for further processing and display. If theadministrator does not have the data requested is, sensor modules for low power scanonly. If the sensor has not been coordinated network coverage, when offline or sensorsmonitor temperature and humidity sensor module of temperature and humidity datacollected can be temporarily FLASH chip, as coordinator of the network coverage tothe sensor module, the sensor module added to the network again. Administrators canmonitor and control interface, are stored in the sensor module in the FLASH upload historical data to the PC. To enable dynamic tracking and analysis of environmentaltemperature and humidity.2. System hardware choicesCC2530T1company-produced by the system. COMS CC2530system chipsolutions to reduce costs, greatly improve system performance. CC2530include8,051and12.4GHZ RF transceiver controller. Have a different FLASH and RAM of8KB32/64/128KB. MAX232integrated as Coordinator and CC2530CC2530isresponsible for receiving and sending data. Router module by CC2530separatecompositions.The second. Temperature and humidity monitoring system software architecture.Software architecture is divided into PC (PC) interface design and lower computer(terminal nodes) of the software design. Computer (PC) software can be done withVB software design, completed two major components, including networkinitialization and the establishment of communication links and displays measurementdata and display in real time monitoring. Slave (terminal nodes) software designed tocomplete receiving and transmission of instructions, read sensor data and recordmeasurements of temperature and humidity. Temperature and humidity in the datacollection process, in order to ensure the reliability and accuracy of the data, shouldstrictly follow the microcontroller reads sequential operation. Data acquisitionsuccessful, single chip in addition to the data in real time on the LCD display, and alsoby monitoring the network to the Coordinator. Wireless temperature and humiditymonitoring of implementation on the target area.The Third, this system features1. Using ZigBee technology, it is the application of embedded technology inwireless communication hot spots. Important means of technology in Internettechnology. Core source code and Wireless ZigBee technology monolithic kernel ofbetter integration, complete data sending and receiving, checking, construction ofvarious network topologies. At present, the chips used by ZigBee technology is lessexpensive, and better system stability, and low power consumption, can be acceptedby many manufacturers and users.2. The system uses the CC2530,8051embedded processors.8051processordomestic popularity, development software, KEIL, IAR is a familiar, the mostconvenient to use. Low power, high speed, low noise advantages, CC25308051kernel specially designed, and ZigBee wireless transceiver circuit for2.4GHZ work perfect, never because its8051high-speed operation of the kernel and any impact onthe high frequency radio communications.3. The system was designed to replace traditional methods of measuringtemperature and humidity, reduce the monitoring of human factor error. Improvedsystem stability and accuracy of measurement.4. The system uses the interactive mode, improves control.THE Fouth, the system needs to be improvedZigBee technology uses primarily the IEEE802standards, hardware is based ona signal transceiver and a microprocessor (using8,16,32-bit core microprocessors),single chip software is used within the protocol stack. This system needs to beimproved are:1. Communication distance problemZigBee wireless transmission signal for general practical communicationdistances of only dozens of meters, due to environmental and obstacle factors andcommunication distance will be shortened. Router signal transmission problems canbe solved, but will have a transmission signal delay, the impact of the real timetransmission of the signal, so this is a problem to be solved urgently.2. Position, signal problemsThis system design of50nodes, located in different position of the measurementarea. Because the terminal nodes of the location and environment, measured by thesame regional node data would still have differences. Resulting in a signal problem ofpositioning errors. Need better network topology design, able to locate moreaccurately, improve measurement accuracy.