Rmon-based Gsm Car Alarm Design

The main function of the electronic vehicle security system is to prevent the theft of vehicles, but it has bad real-time, and it cannot notices car owner timely when happening car theft. The network vehicle security system has all the good features of the electronic, and make up for the biggest drawback of the bad real-time of the electronic one, and the network vehicle security system is based on GSM network or other network, which is the Combination of the car security system and mobile phone.The network vehicle security system is based on GSM network, when car theft occurs, it can promptly notices car owner by telephone or SMS, and owners can monitor vehicle, scare thieves, and prohibit driving by telephone; In normal situation, the owner can controls car by telephone or SMS, such as defense, lock doors, not defense, unlock doors, vehicle ignition, vehicles flameout.This paper is a comprehensive description and summary after the successful design of the network vehicle security system. Article focuses on product research and design, the research content include voice system design based on voice chip WTV170, how to use AT command to realize phone applications and SMS applications with GSM module, and the detection and identification of DTMF signal, and so on, its important works as follows:Firstly, design the voice system of vehicle security system, including using one-time voice chip WTV170 to record real voice, which is product related to, as well as how to control voice chip with MCU STC89C54RD +.Secondly, send AT command control GSM module through serial port, including phone answer and call, SMS.Thirdly, detect the DTMF signal, mainly using HM9270C / D to receive DTMF signals.Fourthly, design the decoding software of RF remote controller with KEELOQ.Finally, summarize the experience of the development and test work, and give the prospect in the future research.