基于I2C总线对pcf8591进行数模转化和模数转化。程序内包含自己写的1206液晶屏的模块，可以完成大量显示任务。-Based on the I2C bus pcf8591 digital-to-analog conversion and analog-to-digital conversion. The 1206 LCD module, you can write your own program includes the completion of a large number of di