数字温度传感器ds18b20+at8051的完整代码，注释详细，代码简洁，只需要改变1820接入51的io口线，就能使用。非常稳定。-digital temperature sensor ds18b20 at8051 integrity code, the Notes detailed, concise code, 1,820 only need to change the io 51 access lines I can use. Very stable.