mega16做控制芯片，DS18b20测试温度，精确到0.1,1602显示温度值。PD4作为16b20的单总线，PD765作为1602的控制线，PA作为1602的数据线

单片机访问多片DS18B20,同时显示在SPI控制的8位8段数码管上,其中用到DS18B20的单总线技术,还有演示程序截图,其中主控单片机为MEGA16-Single-chip multi-chip access DS18B20, at the same time displayed on the SPI-controlled 8-bit digital tube on paragraph 8, which uses a single bus technology DS18B20, as wel