ad421可把串行输入的数据转换输出为4——20ma电流的器件。此为测试程序代码。-ad421 serial input data can be converted to output 4- 20ma current devices. This is the test code.

AD421在C55中用SPI总线控制的应用程序-AD421 at C55 with SPI bus control applications

单片机c8051F310，AD8538采集模拟量（spi） AD421输出模拟电流，（spi)12864点阵液晶显示(spi),USB（UART转），4路开关量输入输出-Single-chip c8051F310, AD8538 Analog Acquisition (spi) AD421 analog current output, (spi) 12864 dot matrix liquid crystal display (spi), USB (UART switch), 4-way swi