"基于单片机的数字万用表设计-电气自动化毕业设计"

Abstract This design project utilizes the AT89S52 microcontroller chip to design a digital multimeter, which is capable of measuring AC and DC voltage values, DC current values, and resistance values. The measured values are displayed on a four-digit digital display. The system consists of a current division section, a voltage division section, a reference resistor section, an AT89S52 microcontroller minimal system, a display section, an alarm section, and an AD conversion section. The design utilizes the AD0809 for analog-to-digital conversion, the AT89S52 microcontroller as the main control chip, along with an RC power-on reset circuit and a 11.0592MHz oscillator circuit, and the TEC6122 chip to drive the 8-digit digital display. Keywords: digital multimeter, AT89S52, microcontroller, AD conversion and control In conclusion, this design project successfully developed a digital multimeter using the AT89S52 microcontroller chip. The system was able to accurately measure AC and DC voltage values, DC current values, and resistance values, displaying the results on a four-digit digital display. By incorporating components such as the AD0809 for analog-to-digital conversion, the AT89S52 microcontroller, and the TEC6122 chip for driving the digital display, the design achieved its intended functionality. The project showcases the application of microcontroller technology in electrical automation, demonstrating the capabilities of modern electronics in the field of measurement instruments. This project serves as a valuable learning experience for students in the field of electrical automation, providing hands-on experience in designing and implementing digital systems.