Arduino Pro Micro 打造PPT遥控器

之前，我们介绍过如何用Arduino Uno打造一个PPT遥控器【参考1】，缺点是制作过程复杂，用到的器件较多导致整体稳定性不好。这里介绍使用 Arduino Pro Micro来做一个同样的PPT遥控器。

原理上和之前的并没有多少差别，都是通过模拟USB键盘的方式来进行控制。差别在于Pro Micro是缩小版的 Leonardo ,内部集成了USB Slave控制器，我们不需要再花费精力模拟自己为USB Keyboard.
硬件连接示意图：

代码是直接修改自示例“KeyboardMessage”

/* 
 Keyboard Button test
 
 For the Arduino Leonardo and Micro.
 
 Sends a text string when a button is pressed.
 
 The circuit:
 * pushbutton attached from pin 2 to +5V
 * 10-kilohm resistor attached from pin 4 to ground
 
 created 24 Oct 2011
 modified 27 Mar 2012
 by Tom Igoe
 
 This example code is in the public domain.
 
 http://www.arduino.cc/en/Tutorial/KeyboardButton
 */

const int buttonPinA = A1;          // input pin for A
const int buttonPinB = A2;          // input pin for B
int previousButtonStateA = HIGH;   // for checking the state of a pushButton
int previousButtonStateB = HIGH;   // for checking the state of a pushButton

void setup() {
  // make the pushButtonA pin an input:
  pinMode(buttonPinA, INPUT);
  // make the pushButtonB pin an input:
  pinMode(buttonPinB, INPUT);
  // initialize control over the keyboard:
  Keyboard.begin();
  delay(10000);
}

void loop() {
  // read the pushbutton:
  int buttonStateA = digitalRead(buttonPinA);
  int buttonStateB = digitalRead(buttonPinB);  
  // if the button state has changed, 
  if ((buttonStateA != previousButtonStateA) 
    // and it's currently pressed:
  && (buttonStateA == HIGH)) {
    // type out a message
    //Keyboard.print("A");
    Keyboard.press(KEY_LEFT_ARROW);
    Keyboard.releaseAll();
  }
  // if the button state has changed, 
  if ((buttonStateB != previousButtonStateB) 
    // and it's currently pressed:
  && (buttonStateB == HIGH)) {
    // type out a message
    //Keyboard.print("B");
    Keyboard.press(KEY_RIGHT_ARROW);
    Keyboard.releaseAll();
  }  
  // save the current button state for comparison next time:
  previousButtonStateA = buttonStateA; 
  previousButtonStateB = buttonStateB;   
}

 

实物图

工作的视频

参考：

1. https://www.lab-z.com/%E7%94%A8-arduino-%E6%89%93%E9%80%A0ppt%E9%81%A5%E6%8E%A7%E5%99%A8/ 用 Arduino 打造PPT遥控器
2. http://arduino.cc/en/Reference/KeyboardModifiers 键值定义