"基于51单片机高精度数字电压表设计说明"

Abstract: With the development of electronic science and technology, electronic measurement has become a necessary means for electronic workers, and the requirements for accuracy and functionality of measurement are increasingly higher, with voltage measurement being particularly prominent. This paper introduces a voltage measurement circuit based on the STC89C51 single-chip microcomputer. The circuit uses a high-precision, dual-integral A/D conversion circuit ICL7135 to measure voltages in the range of 0-5 volts DC, displayed using LED digital tubes. The paper briefly introduces the principle of the dual-integral circuit, the characteristics of STC89C51, the functions and applications of ICL7135, and focuses on describing the design concept of the high-precision digital voltmeter. The working principles, design process, and debugging process of each part of the circuit are analyzed, and detailed test data are provided with analysis. Keywords: voltage measurement; STC89C51; ICL7135; high precision.