8051 using single

代码说明：

用单片机8051控制DS18B20温度传感器，包括温度上下限的设置（可以通过串口及时设置进DS18B20），读取及时温度，当温度超过上下限报警功能。-8051 using single-chip temperature sensor DS18B20 control, including the upper and lower limits of temperature settings (through the serial port settings into timely DS18B20), read the timely temperature, when the temperature exceeds the alarm function of the upper and lower limits.