The Grain Deport's Temperature Wireless Monitor Terminal's Design And Implementation Based On Microcontroller MSP30F149

The safety of food storage is a strategic priority which related to the people's livelihood, that cost the state's a lot of manpower and material resources every year. With result of the grain depots generally covers an large area, and the relative position between depots is scattered, so that there are a great amount of work by manual inspection, that is inefficient, and easily missed when monitoring, inspecting by manual require a long cycle. As science and technology development, especially the progress of modern electronic technology in recent years, there are a large numbers of intelligent instruments on the management of grain storage. But these traditional monitoring instruments commonly used RS-485 and other wired data communication method for data exchange with the monitoring center. Which require complicated wiring process, difficulties to expand and problems in a node will affect the entire system, this will not conducive to the granary of the monitoring and management. This paper presents a wireless surveillance terminal design based on modern mobile communication technology.The project including two parts, one of them is morning data center database management system and the other is monitoring points to monitor the terminal. This paper focuses on the development process of monitoring the terminal.Monitoring terminal is constitute of five parts,which is the power module, data acquisition module, wireless communication module, display module and main control module. The main control module include a high-performance, ultra low power 16-bit MCU-MSP430F149, which has strong processing capabilities in low price; Data acquisition module using a single bus architecture DS 18B20, Using few MCU's 10 resources, and easily to expand. DS18B20 internal integration AD circuit, and is able to directly provide the digital to MCU, thus greatly improving the sensor transmission distance and noise immunity. The wireless communication module uses a two-band GSM/GPRS wireless modules send and receive data, which has up to 115kbit/s transfer rate (maximum value 171.2kbit/s, don't including FEC). with the "mobile Internet" service, user could communicate with inspecting center. Communication costs are low, and without distance limitations. The field data processed by the MSP430F149 after collection with sensor array, and shown by display module in the monitoring points. And regularly interact with data centers. The system set upper and lower limits of temperature control, when the temperature gauge automatically send alarm.The wireless surveillance terminal has been to checked and accepted, and running well, and have reliable communication, the advantages of low investment and easile to expand; The system has high precision, and could meet the design requirements well; The system has good adaptability, with a little transformation can also be applied to other wireless monitoring and control applications.