采用MSP430F149作为CPU,通过USB端口与PC机通信，实现AD——DC转换。-Using MSP430F149 as the CPU， via a USB port and a PC communication to achieve AD- DC conversion.

pcf8591ad_da转换，读入一个数字并将其转化为模拟量控制发光二极管 ，并输入以模拟量转化为为数字量显示在8为数码管上面-pcf8591ad_da conversion, read into a digital and analog control of light-emitting diodes, and input to analog into a digital display in the 8 digital tube above

基于51单片机的ad/da转换程序，i2c通讯，双pcf8591转换。-Based on 51 single chip ad/da conversion process, I2C communications, dual pcf8591 conversion.