一个万年历，通过232串口可是实现用下位机来调整上位机（万年历）的日期。此外，还可以通过2304传感器来获取环境温湿度值，并显示在上位机上面-A calendar, the date by 232 but implemented by the next crew to adjust the PC (calendar) of. In addition, you can also get the 2304 environmental temperature and humidity sensor v