基于单片机的数字万用表设计-电气自动化毕业设计.

基于单片机的数字万用表设计是电气自动化大学生毕业设计的重要内容之一。该设计采用单片机芯片AT89S52作为主控芯片，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。设计使用AD0809进行模数转换，配以RC上电复位电路和11.0592MHZ震荡电路，采用芯片TEC6122驱动8位数码管显示。整个系统由分流部分、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。通过该设计，可以实现对电气参数的准确测量和显示，具有一定的实用价值。 关键词：数字万用表，AT89S52，单片机，AD转换与控制 Abstract This design is design a digital universal met based on single-chip microcomputer, and it is an important part of the graduation design for electrical automation college students. The design uses the single-chip microcomputer chip AT89S52 as the main control chip, which can measure the AC and DC voltage values, DC current values and resistance values, and display the values in four-digit numerals. The design uses AD0809 for analog-to-digital conversion, with RC on-power reset circuit and 11.0592MHZ oscillation circuit, and uses the chip TEC6122 to drive the 8-digit digital tube display. The whole system is composed of current divider part, voltage divider part, reference resistor part, 51 single-chip microcomputer minimum system, display part, alarm part, and AD conversion part. Through this design, accurate measurement and display of electrical parameters can be realized, which has certain practical value.