大部分的Arduino控制板已经有一个附加到13脚的LED了.也就是说,如果你没有额外的LED硬件,你也可以看到控制板上自带的LED灯闪.
Most Arduino boards already have an LED attached to pin 13 on the board itself. If you run this example with no hardware attached, you should see that LED blink.
随着市场对热轧板带钢精度要求的日益严格，各种控制板形的新技术也在不断地进步。
With increasingly strict demands for thickness tolerance of hot rolling strip in market, various new technologies for controlling strip profile have been developed.
应用推荐