本文运用AT89S51进行A/D转换,根据数据采集的工作原理,设计实现数字电压表,最后完成单片机与PC的数据通信,传送所测量的电压值 -In this paper, AT89S51 for A/D conversion, data acquisition in accordance with the working principle, design of digital voltage meter, and finally to complete single-chip data com