预防儿童被锁车内报警系统开发

Development of Alarm System for Preventing Children from Being Locked in a Car

摘要: 为了预防儿童被锁车内而危及生命安全，设计开发了一种预防儿童被锁车内的报警系统。该系统基于Raspberry Pi3，集成了多种传感器、通信、执行模块，实现实时监测、准确判断、及时报警、安全自救的功能。系统通过GPS模块，同时结合三轴加速度计确定车辆运动状态，然后通过红外、二氧化碳传感器来检测车内是否有滞留儿童，并由无线上网卡将危险警告短信发送至监护人手机。在危险情况下，系统会自动报警并发送位置信息，执行模块将自动打开车窗以实现自救。系统进行了50次模拟儿童滞留车内的实验，其结果表明：判断儿童滞留车内而形成高温危险的正确率为100%，同时通过短信向监护人手机发送信息100%。该装置可有效预防儿童滞留车内，并能在危险情况下实现自救。

Abstract: In order to prevent children from being locked in the car to form a high temperature hazard, a warning system for preventing children from being locked in is designed. The system is based on Raspberry Pi3, and integrates various sensors, communication and execution modules to achieve real-time monitoring, accurate judgement, timely alarm, and even self-rescue function. The system first judges the vehicle motion through the GPS module and the triaxial accelerometer. Then the system will check whether children are trapped in the car or not through infrared sensors and the carbon dioxide sensors, and the wireless network card will send warning messages to guardians. Besides, in a dangerous situation, the system will automatically call the police and send position information, and the execution module can automatically open the window to achieve self-rescue. The system has carried out 50 experiments of simulating children trapped in the car. The results show that the rate of judging children trapped in the car correctly is 100%, while the rate of sending messages to guardians is also 100%. The device can effectively prevent the children from being locked in the car and can save children in dangerous conditions.