玉林师范学院本科生毕业设计
基于单片机的计步器设计
The Pedometer Design Based on Single Chip Microcomputer
院 系 专 业 学 生 班 级 姓 名 学 号
指导教师单位 指导教师姓名 指导教师职称
电子与通信工程学院
电信工程 2012级1班 胡丽娜 201208401144
电子与通信工程学院
吕集尔 高级实验师
基于单片机的计步器设计
电子信息科学与技术 2012级1班 胡丽娜
指导老师 吕集尔
摘要
简易加速度计步器以竖直方向加速度传感器MMA7260与单片机PIC18F452组成的计步测试系统，能够对人体运动的运动量作出评估。与传统的机械式传感器不同，MMA7260是电容式传感器，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。单片机控制5110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：单片机，电子计步器，加速度传感器
The Pedometer Design Based on Single Chip Microcomputer
Electronic Information Science and Technology 2012-1 Hulina
Supervisor Lvjier
Abstract
Simple acceleration pedometer with triaxial acceleration sensor MMA7260 step meter test system composed of MCU PIC18F452, can exercise an assessment to the human body movement.Different from the traditional mechanical sensor, sensor MMA7260 is capacitive three axis, by acceleration signal when it captures the human body movement, more accurate.Is filtered by low-pass filter, the single chip microcomputer built-in A/D converter for signal sampling, A/D conversion.Software using adaptive algorithm implementation plan step function, reduce the error count, more precise.Single-chip microcomputer control step 5110 liquid crystal display meter.The whole machine working current is only 1-1.5 mA, realize ultra-low power consumption.
Keywords:SCM, electronic pedometer, triaxial acceleration sensor
目录
1 引言 ............................................................................................................................... 1 2系统总体设计 ................................................................................................................ 1
2.1总体框图 .............................................................................................................. 1 2.2传感器选择 .......................................................................................................... 2 2.3 低通滤波器理论分析 ......................................................................................... 2 3 硬件电路设计 ............................................................................................................... 3
3.1 传感器连接及滤波电路模块 ............................................................................. 3 3.2 微处理器模块 ..................................................................................................... 4 3.3显示模块 .............................................................................................................. 5 4 软件设计 ....................................................................................................................... 6 5 制作与调试 ................................................................................................................... 8
5.1 硬件电路单片机部分的连接图 ......................................................................... 8 5.2 调试 ..................................................................................................................... 8 5.3 实测及误差分析 ................................................................................................. 9 6 结论及建议 ................................................................................................................... 9 参考文献 ......................................................................................................................... 11 附录1 实物图 ................................................................................................................ 11 附录2 总原理图 ............................................................................................................ 12 附录3 源程序 ................................................................................................................ 13 附录4 加速度计步器MMA7260简介........................................................................ 18
