基于MAX517的串行DA转换，介绍了在51单片机系统中实现串行DA转换的方法，C语言编写。-MAX517 based serial DA conversion, introduced 51 single-chip microcomputer system in the realization of the method of serial DA conversion, C language.

PCF8591的da输出程序，用51单片机控制电压输出值-The the PCF8591 da output program, with 51 single-chip control voltage output value