"STC89C51单片机高精度数字电压表设计论文初稿"

The development of electronic science and technology has led to the increasing demand for high-precision electronic measurement tools. Voltage measurement is particularly important, as it is a common and fundamental aspect of electronic work. This paper introduces a high-precision voltage measurement circuit based on the STC89C51 microcontroller. The circuit utilizes a high-precision, dual-integral A/D conversion circuit ICL7135, with a measurement range of 0-5 volts DC, and uses LED digital display. The paper provides an overview of the principles of the dual-integral circuit, the characteristics of the STC89C51 microcontroller, the functions and applications of ICL7135, and focuses on the design concept of the high-precision digital voltmeter. The working principles, design process, and debugging process of both the hardware and software components are analyzed in detail. Additionally, comprehensive test data are presented and analyzed. The key words in this thesis include voltage measurement, STC89C51, ICL7135, and high precision. The paper aims to provide a thorough exploration of the design and implementation of a high-precision digital voltmeter. With the increasing demand for high-precision electronic measurement tools, this paper serves to address the need for a detailed design and analysis of such a device. The combination of the STC89C51 microcontroller and the ICL7135 A/D conversion circuit represents a novel and effective approach to achieving high-precision voltage measurement. The paper provides a valuable reference for electronic engineers and researchers working in the field of electronic measurement and instrumentation.