The Auto-guard System Based On LIN Bus And MMS

The new statistics show that China has become the world's second auto consumption market. Autos not only improve the quality of people's life, but also bring great convenience for traveling. In addition, it raises another technology: auto guard. The current auto guard products have some disadvantages such as high false alarm rate,inconvenience of installation and maintaining,sound and light pollution and high price. The developing technologies of microelectronic,automotive network bus and wireless mobile communication provide us new ideas and new methods.This paper discusses the overall conceptual design of auto-guard system based on LIN bus and MMS. After the analyzing the characteristic of the Short Message Service (SMS) and Multimedia Messaging Service (MMS), we choose to build our system with the combination of LIN bus, SMS and MMS.We designed the terminal hardware structure based on LIN bus. It introduces the terminal's hardware design method and correlative details of circuit implement which include chip selection, interface circuit between DSP and MCU, GPRS module interface circuit, power supply. It also fully discusses the image acquisition and compression based on DSP.The software of the system was designed to realize the function as follows: sending SMS in Chinese or MMS to appointed mobile telephone when detectors placed in auto was activated; User can know which part is offended accurately through alarm message; In emergency, the user can control auto by the means of breaking its oil circuit and switching off its motor. In addition, user can remotely control auto by computer.