"You can embed intelligent behavior with roller switches, similar to the switch that activates a fridge light, or an AND and OR gate (logic gates are the fundamental of programming), " explains Bdeir.

可以嵌入智能行为与滚轮开关，类似于激活冰箱灯的开关，或与或非门（逻辑门是程序设计基础），解释说：”比德尔。

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In the paper, traffic signal light is controlled by PLC-200 by using programming logic controller of Siemens company.

文章主要是采用西门子公司的可编程逻辑控制器PLC - 200来实现交通信号灯的控制。

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While PLC logic control, data operations, data comparison, data transmission through the process of combining organic and not only control the traffic light changes, as well as the time display.

同时将PLC的逻辑控制、数据运算、数据比较、数据传送通过程序有机的结合起来，既控制交通灯的变化，还有时间显示。

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So to be clear, we expect most students to very comfortably pursue the standard edition of the P set, but for this particular P set, and we have about 150 or so of these out on the hallway, and we'll have them at office hours throughout the coming week--this is a little logic board ; with lots of sensors; the sound sensor, a light sensor, a little joystick and the like.

我希望我们大多数同学,研究问题集的标准版本，可编程版有个特殊的问题集，我们会在接下来的几周里，在办公时间为大家做解答,这是个小的逻辑板,上面有很多传感器;,包括声音传感器，光传感器，小操作杆等。

哈佛公开课 - 计算机科学课程节选

Admittedly, this unusual memory requires an internal light source, but the amount of illumination required is tiny and consumes less power than the logic circuits that are used to read data in and out.

ECONOMIST: Just press print