积分式数字电压表的资料和程序。里面有用proteus仿真的电路和双积分AD的详细资料！同时附有完整的电压表程序。此程序在52核单片机上运行-Integrating digital voltmeter data and procedures. Useful inside proteus simulation circuit and the double integral AD details! Be accompanied by a complete voltmeter program. This