arduino 学习（2）

1. I/O口的高级应用

   1. 调声函数
      1. tone()
         
      2. noTone()
         

       /*
   Melody
   
   Plays a melody
   
   circuit:
   - 8 ohm speaker on digital pin 8
   
   created 21 Jan 2010
   modified 30 Aug 2011
   by Tom Igoe
   
   This example code is in the public domain.
   
   https://www.arduino.cc/en/Tutorial/BuiltInExamples/toneMelody
   */
   
   #include "pitches.h"
   
   // notes in the melody:
   int melody[] = {
   NOTE_C5, NOTE_D5, NOTE_E5, NOTE_F5, NOTE_G5, NOTE_A5, NOTE_B5
   };
   
   // note durations: 4 = quarter note, 8 = eighth note, etc.:
   int noteDurations[] = {
   4, 4, 4, 4, 4, 4, 4
   };
   
   void setup() {
   // iterate over the notes of the melody:
   for (int thisNote = 0; thisNote < 8; thisNote++) {
   
       // to calculate the note duration, take one second divided by the note type.
       //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
       int noteDuration = 1000 / noteDurations[thisNote];
       tone(8, melody[thisNote], noteDuration);
   
       // to distinguish the notes, set a minimum time between them.
       // the note's duration + 30% seems to work well:
       int pauseBetweenNotes = noteDuration * 1.30;
       delay(pauseBetweenNotes);
       // stop the tone playing:
       noTone(8);
   }
   }
   
   void loop() {
   // no need to repeat the melody.
   }

   2. 脉冲宽度测量函数及超声波测距
      1. pulseIn()
         
      2. 超声波测距
   3. 设置ADC参考电压
      
   4. 外部中断
      1. 外部中断的使用
         
      2. 中断模式
         
      3. 中断处理函数
         
      4. 配置
         
         
      5. 外部中断触发蜂鸣器报警

         boolean RunBuzzer = true;
         
         void setup() {
         // put your setup code here, to run once:
         Serial.begin(9600);
         attachInterrupt(0, warning, CHANGE);
         }
         
         void loop() {
         // put your main code here, to run repeatedly:
         if(RunBuzzer) {
             tone(8, 1000);
         } else {
             noTone(8);
         }
         }
         
         void warning() {
         RunBuzzer = !RunBuzzer;
         }

         

2. 使用和编写类库

   1. 将常用函数封装起来使用
   2. 使用他人的类库
      C:\Users\Lei Zhao\AppData\Local\Arduino15\libraries
   3. 编写类库
      1. 编写头文件
      2. 编写cpp文件
      3. 关键字高亮显示
         编写keywords.txt文件
   4. 编写示例程序

3. 类库的优化和发布
   这里简单写了一个lib并上传到了Github上。
   https://github.com/leiz-eng/Ultrasonic_SR04
   如果想要自己的lib可以在manager中被别人搜到，因为采用的是Libs Manager的形式，需要参考如下链接
   https://github.com/arduino/library-registry/blob/main/FAQ.md#submission-requirements