基于单片机的数字万用表设计-电气自动化-学位论文

xx 职业学院 毕业设计（论文）题 目： 系 部： 电子工程系 专 业： 电气自动化 学 号： 学生姓名： 指导老师： 职 称： 讲师 二 O 一四年一月八日摘 要本设计采纳单片机芯片 AT89S52 设计一个数字万用表，能够测量交、直流电压值、直流电流值、电阻值。并以四位数码显示数值。此系统由分流部分、分压部分、基准电阻部分、51 单片机最小系统、显示部分、报警部分、AD 转换部分组成。本设计使用 AD0809 进行模数转换，采纳 AT89S52 单片机作为主控芯片，配以 RC 上电复位电路和 11.0592MHZ 震荡电路，采纳芯片 TEC6122 驱动 8 位数码管显示。关键词：数字万用表，AT89S52，单片机，AD 转换与控制AbstractThis design is design a digital universal meter with chip AT89s51 of one-chip computer, can measure and hand in , direct current pressing value , direct current flow , the direct current is hindered, four numbers show. This system is shunted resistance, resistance of partial pressure, basic resistance, minimum system of 51 one-chip computers, shown that some , warning part , AD change and control making up partly. In order to make the system more steady, make the whole precision of the system be ensured, this circuit has used AD0809 data to change the chip, the one-chip computer system is designed to adopt AT89S52 one-chip computer as the top management chip, the electricity is restored to the throne the circuit and 11.0592MHZ and shaken the circuit to match on RC, show that the chip uses TEC6122, urge 8 numbers to be in charge of showing. The every execution cycle consuming time of procedure contracts to get shortest, in this way the real-time character of the security system. Keyword: Digital universal meter ， AT89S52 ，one-chip computer， AD changes and controls 目 录1 绪论.................................................................................................................................