摘要目前，社会上出现老人跌倒没人敢扶的现象，导致老人的意外伤害甚至是死亡，老龄化进程的加剧也在威胁很多老年人的生命安全。因此，在不影响老年人正常活动的前提下，可以利用科学、有效的手段来监测老人的日常活动，在检测到老人跌倒后迅速发生报警向周围的人求助。市场上有很多价格昂贵，制造工序繁琐的报警器，他们很难符合老百姓的消费需求，因此很难得到广泛的应用。84505

本文提出了一种基于ADXL345倾角传感器的跌倒检测与GSM短信收发模块的老人跌倒报警系统。首先，根据报警器要实现的功能，对老人跌倒报警系统的方案进行整体的设计；然后，对报警系统的硬件系统进行详细的设计，其中传感器部分选用ADXL345倾角传感器，控制模块选用STC89C52型单片机，短信收发模块选用了SIM900A；同时，详细进行了老人跌倒报警的软件设计，绘制软件流程图，并编写了相关的程序；最后，对老人跌倒报警系统进行一系列的调试和分析。

本款老人跌倒报警器能够实现一些基本的功能，ADXL345倾角传感器能够实时采集老人在日常活动中产生的倾角数据，将所测得的实时数据送到单片机STC89C52进行处理，判断老年人所处的运动状态。当系统检测到跌倒发生时，发出报警的声音提醒老人和周围的人，寻求他人的帮助，并且能够将报警短信发送到指定的亲属或朋友手机上，使得亲属能够在第一时间到达跌倒的现场，实施一系列的补救措施。

毕业论文关键词：老人跌倒报警；ADXL345倾角传感器；STC89C52；GSM模块 

Abstract Nowadays, the phenomenon of no one dare to help the elderly who fall is emerging at society ,which leads to the old man's accidental injury and even death, intensified aging process are also threatened to a lot of old people's life。 Therefore, under the premise of avoid affecting the normal activity of the elderly, we can use scientific and effective means to detect the old man's daily activities,it can quickly calls to the people around you for help after detecting the falls of the elderly。 There are a lot of expensive machine on the market, manufacturing process trival alarm, it difficult for them to conform to the ordinary consumer demand, so it is difficult to get a wide range of applications。

This paper proposes a fall detection based on ADXL345 Angle sensor and GSM short message transceiver module of the old man fell and alarm system。 First of all, according to the function, the alarm will implement the overall scheme of the old man fell and alarm system design; Then, the hardware system of alarm system detailed design, including sensor part selects the ADXL345 obliquity sensor, control module chooses STC89C52 singlechip, SMS transceiver module choose the SIM900A; Then, detailed discusses the software design of the old man fell and alarm, draw the flow chart of software design, and write the related procedures; Finally, the old man fell to analyze a series of debugging and alarm system。

This old man fall alarm can achieve some of the basic functions, ADXL345 Angle sensor can real-time data collection and the old man in the daily activities of Angle, will have to process the real-time data to the microcontroller STC89C52 measured, judge's motion state in the elderly。 When the system detects fall occurs, the alarm sound to remind the old man and the people around you, seek the help of others, and be able to send alarm messages to the specified relatives or friends on the phone, make relatives for the first time arrived at the scene that falls to implement a series of remedial measures。

Key words: alarm for the falls of elderly; ADXL345 inclination sensor; STC89C52; GSM module

目录

第一章  绪论 1