DS18B20温度传感器和1602驱动程序，在51上测试通过，只需调用chang()和tmp()函数，即可读取温度值，通过1602显示，简单，方便-DS18B20 temperature sensors and 1602 drivers, in 51 on the test, simply call the chang () and tmp () function, you can read the temperature through the 1602 show, a simple and