The Design Of Preventing Drunken Driving And The Automobile Monitoring Security System Based On ARM

According to the real social requirements and analysis of the technology of domestic and international anti-drunk driving and automobile anti-theft, a design of preventing drunken driving and the automobile monitoring security system based on ARM was proposed. The alcohol detector and network-based vehicle anti-theft technology were acted as the foundation of this system, complementing the original car anti-theft system and improving the ability of automobile anti-theft; this system can effectively prevent drivers from drunk driving and avoid road traffic injuries caused by drinking.By reference to a large number of domestic and foreign literature, analysis of the requirements of system function, basic composition and working principle, the overall design of the system was presented, it consisted of a handheld alcohol detecting system and vehicle master control system using wireless radio frequency communication. The hardware design of handheld alcohol detecting system was based on low power MSP430single chip microcomputer as the core, including alcohol detecting circuit, gas pressure detecting circuit, liquid crystal display and alarm circuit, etc. ARM microprocessor S3C44B0X was acted as the core of this design, hardware like the pyroelectric infrared human body detecting circuit, GPS module, GSM module, engine block control module and so on were added. With C language as the main language and necessary assembly language, handled system modular software design was accomplished, vehicle-mounted system and embedded operating system μC/OS-Ⅱ were transplanted and application program was written.Finally, this system was debugged and tested, the function of debugging mainly embraced determination of threshold value of gas pressure, calibration of alcohol test, LCD and alarm, wireless radio frequency transceiver module, GPS module and GSM module and so on. Four cases were simulated by experiments. The results show that the alcohol detection has a high sensitivity and high reliability to prevent drunk driving. Within the scope of0.5meters, the sensor recognition effect of pyroelectric infrared human body is ideal, realizing the function of car alarm.