4~20mA电流环输出式数模转换器AD421的基本接线-4 ~ 20mA current loop output DAC AD421 basic wiring

MSP430f5438和AD421，的多功鞥电流源设计，可输出常见的波形，同时带有初步蓝牙的通讯-MSP430f5438 and AD421, multifunctional Eng current source design, common output waveform, while preliminary with Bluetooth communications