1. 功能描述

本例子演示了如何使用tone()命令生成notes。程序会播放一个你可能早就已经过的小旋律。

2. 需要硬件

ü  Arduino 板子

ü  8欧姆的小扬声器

ü  100欧美电阻

ü  面包板

ü  安装线

3. 电路连接图

通过一个100Ω的电阻，连接扬声器的正极到数字针脚号。链接负极到地。

4. 原理图

5. 程序

/*

  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.

 http://arduino.cc/en/Tutorial/Tone

 */

 #include "pitches.h"

// notes in the melody:

int melody[] = {

  NOTE_C4, NOTE_G3,NOTE_G3, NOTE_A3, NOTE_G3,0, NOTE_B3, NOTE_C4};

// note durations: 4 = quarter note, 8 = eighth note, etc.:

int noteDurations[] = {

  4, 8, 8, 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.

}

6. 实验照片