实现下位机（51单片机）测量温度并液晶显示，且将温度数据通过串口发送给上位机（PC），上位机壳通过发送指令控制51单片机测温的开与关-To achieve lower machine (51 MCS) measure the temperature and the liquid crystal display, and temperature data will be sent to the host computer through the serial port (PC), the upper casing 51 by sending commands to control temperature and off microcontroller