无涯教程-Arduino - 键盘注销当ARDUINO UNO的针脚2接地时，此示例使用键盘库使您退出计算机上的用户会

当ARDUINO UNO的针脚2接地时，此示例使用键盘库使您退出计算机上的用户会话，同时模拟两个或三个键的按键，并在短暂延迟后释放它们。

所需组件

您将需要以下组件-

1×Breadboard
1×Arduino Leonardo,Micro或Due板
1×pushbutton
1×跳线

电路图

遵循电路图，并连接面包板上的组件，如下图所示。

打开计算机上的Arduino IDE软件，使用Arduino语言进行编码将控制您的电路，通过单击"新建"打开一个新的sketch文件。

对于此示例，您需要使用Arduino IDE 1.6.7

注意-您必须在Arduino库文件中包含键盘库。

Arduino代码

/*
   Keyboard logout
   This sketch demonstrates the Keyboard library.
   When you connect pin 2 to ground, it performs a logout.
   It uses keyboard combinations to do this, as follows:
   On Windows, CTRL-ALT-DEL followed by ALT-l
   On Ubuntu, CTRL-ALT-DEL, and ENTER
   On OSX, CMD-SHIFT-q
   To wake: Spacebar.
   Circuit:
   * Arduino Leonardo or Micro
   * wire to connect D2 to ground.
*/
#define OSX 0
#define WINDOWS 1
#define UBUNTU 2
#include "Keyboard.h"
//更改它以匹配您的平台：
int platform=WINDOWS;
void setup() {
//使引脚 2 成为输入并打开
//上拉电阻，所以它变高，除非
pinMode(2, INPUT_PULLUP);
Keyboard.begin();
}
void loop() {
while (digitalRead(2) == HIGH) {
//在引脚 2 变低之前什么都不做
delay(500);
}
delay(1000);
switch (platform) {
case OSX:
Keyboard.press(KEY_LEFT_GUI);
  </span><span class="com">//Shift-Q 注销：</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">press</span><span class="pun">(</span><span class="pln">KEY_LEFT_SHIFT</span><span class="pun">);</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">press</span><span class="pun">(</span><span class="str">Q</span><span class="pun">);</span><span class="pln">
  delay</span><span class="pun">(</span><span class="lit">100</span><span class="pun">);</span><span class="pln">
  
  </span><span class="com">//enter:</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">write</span><span class="pun">(</span><span class="pln">KEY_RETURN</span><span class="pun">);</span><span class="pln">
  </span><span class="kwd">break</span><span class="pun">;</span><span class="pln">
  
  </span><span class="kwd">case</span><span class="pln"> WINDOWS</span><span class="pun">:</span><span class="pln">
  </span><span class="com">//CTRL-ALT-DEL:</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">press</span><span class="pun">(</span><span class="pln">KEY_LEFT_CTRL</span><span class="pun">);</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">press</span><span class="pun">(</span><span class="pln">KEY_LEFT_ALT</span><span class="pun">);</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">press</span><span class="pun">(</span><span class="pln">KEY_DELETE</span><span class="pun">);</span><span class="pln">
  delay</span><span class="pun">(</span><span class="lit">100</span><span class="pun">);</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">releaseAll</span><span class="pun">();</span><span class="pln">
  
  </span><span class="com">//ALT-l:</span><span class="pln">
  delay</span><span class="pun">(</span><span class="lit">2000</span><span class="pun">);</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">press</span><span class="pun">(</span><span class="pln">KEY_LEFT_ALT</span><span class="pun">);</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">press</span><span class="pun">(</span><span class="str">l</span><span class="pun">);</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">releaseAll</span><span class="pun">();</span><span class="pln">
  </span><span class="kwd">break</span><span class="pun">;</span><span class="pln">
  
  </span><span class="kwd">case</span><span class="pln"> UBUNTU</span><span class="pun">:</span><span class="pln">
  </span><span class="com">//CTRL-ALT-DEL:</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">press</span><span class="pun">(</span><span class="pln">KEY_LEFT_CTRL</span><span class="pun">);</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">press</span><span class="pun">(</span><span class="pln">KEY_LEFT_ALT</span><span class="pun">);</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">press</span><span class="pun">(</span><span class="pln">KEY_DELETE</span><span class="pun">);</span><span class="pln">
  
  delay</span><span class="pun">(</span><span class="lit">1000</span><span class="pun">);</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">releaseAll</span><span class="pun">();</span><span class="pln">
  
  </span><span class="com">//输入确认注销：</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">write</span><span class="pun">(</span><span class="pln">KEY_RETURN</span><span class="pun">);</span><span class="pln">
  </span><span class="kwd">break</span><span class="pun">;</span><span class="pln">

}
//do nothing:
while (true);
}
Keyboard.releaseAll();
//enter:
Keyboard.write(KEY_RETURN);
break;
case WINDOWS:
//CTRL-ALT-DEL:
Keyboard.press(KEY_LEFT_CTRL);
Keyboard.press(KEY_LEFT_ALT);
Keyboard.press(KEY_DELETE);
delay(100);
Keyboard.releaseAll();
//ALT-l:
delay(2000);
Keyboard.press(KEY_LEFT_ALT);
Keyboard.press(l);
Keyboard.releaseAll();
break;
case UBUNTU:
//CTRL-ALT-DEL:
Keyboard.press(KEY_LEFT_CTRL);
Keyboard.press(KEY_LEFT_ALT);
Keyboard.press(KEY_DELETE);
delay(1000);
Keyboard.releaseAll();
  </span><span class="com">//输入确认注销：</span><span class="pln">
  </span><span class="typ">Keyboard</span><span class="pun">.</span><span class="pln">write</span><span class="pun">(</span><span class="pln">KEY_RETURN</span><span class="pun">);</span><span class="pln">
  </span><span class="kwd">break</span><span class="pun">;</span><span class="pln">

}
//do nothing:
while (true);
}

注意代码

在将程序上传到板上之前，请确保已将当前使用的正确操作系统分配给平台变量。

在运行sketch时，按下按钮会将引脚2接地，电路板会将注销序列发送到USB连接的PC。

输出结果

当您将引脚2接地时，它将执行注销操作。

它使用以下键盘组合注销-

在 Windows 上，先按CTRL-ALT-DEL，再按ALT-l
在 Ubuntu ，CTRL-ALT-DEL和ENTER
在 OSX 上，CMD-SHIFT-q

无涯教程-Arduino - 键盘注销

所需组件

电路图

Arduino代码

注意代码

输出结果

参考链接