Arduino - Keyboard Logout

Sohail Gulam

unoarduino

This example uses the Keyboard library to log you out of your user session on your computer when pin 2 on the ARDUINO UNO is pulled to ground. The sketch simulates the keypress in sequence of two or three keys at the same time and after a short delay, it releases them.

Warning − When you use the Keyboard.print() command, Arduino takes over your computer's keyboard. To ensure you do not lose control of your computer while running a sketch with this function, set up a reliable control system before you call Keyboard.print(). This sketch is designed to only send a Keyboard command after a pin has been pulled to ground.

#include "Keyboard.h"

#define OSX 0
#define WINDOWS 1
#define UBUNTU 2
// change this to match your platform:
int platform = WINDOWS;
void setup() {
   // make pin 2 an input and turn on the
   // pullup resistor so it goes high unless
   // connected to ground:
   pinMode(2, INPUT_PULLUP);
   Keyboard.begin();
}
void loop() {
   while (digitalRead(2) == HIGH) {
      // do nothing until pin 2 goes low
      delay(500);
   }
   delay(1000);
   switch (platform) {
      case OSX:
      Keyboard.press(KEY_LEFT_GUI);
	  
      // Shift-Q logs out:
      Keyboard.press(KEY_LEFT_SHIFT);
      Keyboard.press('Q');
      delay(100);
	  
      // 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();
	  
      // Enter to confirm logout:
      Keyboard.write(KEY_RETURN);
      break;
   }
   // 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();
	  
      // Enter to confirm logout:
      Keyboard.write(KEY_RETURN);
      break;
   }
// do nothing:
   while (true);
}