I基于51单片机计步器的设计基于单片机的计步器设计及实现摘要:计步器是一种颇受欢迎的日常锻炼进度监控器，可以激励人们挑战自己，增强体质，帮助瘦身。早期设计利用加重的机械开关检测步伐，并带有一个简单的计数器。晃动这些装置时，可以听到有一个金属球来回滑动，或者一个摆锤左右摆动敲击挡块。计步器功能可以根据计算人的运动情况来分析人体的健康状况。而人的运动情况可以通过很多特性来进行分析。与传统的机械式传感器不同，ADXL345是电容式三轴传感器，由它捕获人体运动时加速度信号，更加准确。信号通过低通滤波器滤波，由单片机内置A／D转换器对信号进行采样、A／D转换。软件采用自适应算法实现计步功能，减少误计数，更加精确。单片机STC89C51控制液晶显示计步状态。整机工作电流只有1-1.5mA，实现超低功耗。关键字：计步器;加速度传感器;ADXL345;低功耗II基于51单片机计步器的设计Designandrealizationofpedometer-basedmicrocontrollersAbstract：Pedometerisapopulardailyexerciseprogressmonitor,canmotivatepeopletochallengethemselves,enhancephysicalfitness,tohelploseweight.Earlydesignsusedaweightedmechanicalswitchdetectsthepace,andwithasimplecounter.Whenshakingthedevice,youcanhearametalballtoslidebackandforth,leftandright,orapendulumswingingpercussionstopper.Pedometerfunctioncancalculatethemovementofpeopletoanalyzethesituationofhumanhealth.Andthemovementofpeoplecanbeanalyzedbymanyfeatures.Withthetraditionalmechanicalsensorsdiffer,ADXL345three-axissensorisacapacitiveaccelerationsignalbyitshumanmotioncapture,andmoreaccurate.Signalthroughalowpassfilter,themicrocontrollerbuilt-inA/Dconverterforsignalsampling,A/Dconversion.Softwareusesanadaptivealgorithmpedometerfunction,reduceerrorcountismoreaccurate.STC89C51SCMcontrolLCDpedometerstate.Machineoperatingcurrentofonly1-1.5mA,ultra-lowpowerconsumption.KeyWords:pedometer;Accelerationsensor;ADXL345;lowpowerconsumptionIII基于51单片机计步器的设计目录1绪论..............................................................11.1论文研究的背景、目的及意义...................................11.2国内外研究现状...............................................11.3本文研究的内容...............................................22方案设计及选择....................................................22.1设计要求.....................................................22.2传感器的选择.................................................22.3MCU微处理器的选择...........................................42.4系统的总体设计...............................................43系统的硬件设计....................................................53.1微处理器电路模块.............................................53.2计步器传感器采集模块.........................................63.3显示模块.....................................................94软件设计.........................................................114.1软件流程图..................................................114.2计步器算法的实现............................................115测试及分析.......................................................165.1系统调试及功能..............................................165.2系统的测试..................................................166总结............................................................18[参考文献].........................................................19附录1.............................................................20附录2.............................................................20总结.................................................
