目 录
引言 ...........................................................1
1 概述.................................................................................................................1
1.1 课题背景..............................................................................................................................1
1.2 电子秤发展现状和发展趋势..............................................................................................1
2 系统方案与功能指标.....................................................................................2
2.1 系统方案..............................................................................................................................2
2.2 任务指标..............................................................................................................................2
3 系统器件选型及参数介绍.............................................................................2
3.1 主控芯片选择......................................................................................................................2
3.2 显示模块选择......................................................................................................................3
3.3 压力传感器..........................................................................................................................5
3.4 AD 采集模块选择................................................................................................................6
4 系统硬件电路设计.........................................................................................6
4.1 主控系统电路......................................................................................................................6
4.2 AD 采集电路........................................................................................................................7
4.3 矩阵键盘电路......................................................................................................................8
4.4 LCD12864 显示电路............................................................................................................8
5 系统程序设计.................................................................................................9
5.1 主程序设计..........................................................................................................................9
5.2 矩阵键盘扫描程序设计....................................................................................................10
5.3 LCD12864 液晶显示程序设计..........................................................................................10
5.4 AD 采集程序设计..............................................................................................................11
6 系统测试.......................................................................................................12
6.1 系统测试与测试结果分析................................................................................................12
6.1.1LCD12864 液晶显示测试................................................................................................12
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