物联网开发笔记（10）- 使用Wokwi仿真micropython on ESP32开发板实现音乐播放

一、实现目的

        利用ESR32开发板和蜂鸣器，实现乐曲播放。原理是通过GPIO口控制PWM的输出，调节不同的音量大小来实现。

二、硬件连接

        

三、代码分析

看注释，写的很明白哦。

main.py

# 蜂鸣器演奏音乐的两个要素就是声音频率、声音持续时间，分别对应乐谱中的音调、节拍。
from machine import Pin,PWM
import time 
 
beeper = PWM(Pin(22))  #定义PWM波端口为GPIO22 # 通过Pin对象来创建PWM对象
tone = [247,262,294,330,349,392,440,494,523,587,659,698,784,1000]  # 设置蜂鸣器的声音大小，由ADC值来控制，蜂鸣器声音范围0-1023
# 音调
music=[   
  5,5,6,8,7,6,5,6,13,13,
  5,5,6,8,7,6,5,3,13,13,
  2,2,3,5,3,5,6,3,2,1,
  6,6,5,6,5,3,6,5,13,13,
 
  5,5,6,8,7,6,5,6,13,13,
  5,5,6,8,7,6,5,3,13,13,
  2,2,3,5,3,5,6,3,2,1,
  6,6,5,6,5,3,6,1,
 
  13,8,9,10,10,9,8,10,9,8,6,
  13,6,8,9,9,8,6,9,8,6,5,
  13,2,3,5,5,3,5,5,6,8,7,6,
  6,10,9,9,8,6,5,6,8
]
 
# 节拍
beat = [
  2,4,2,2,2,2,2,8,4,4,
  2,4,2,2,2,2,2,8,4,4,
  2,4,2,4,2,2,4,2,2,8,
  2,4,2,2,2,2,2,8,4,4,
 
  2,4,2,2,2,2,2,8,4,4,
  2,4,2,2,2,2,2,8,4,4,
  2,4,2,4,2,2,4,2,2,8,
  2,4,2,2,2,2,2,8,
 
  4,2,2,2,4,2,2,2,2,2,8,
  4,2,2,2,4,2,2,2,2,2,8,
  4,2,2,2,4,2,2,5,2,6,2,4,
  2,2,2,4,2,4,2,2,12
]
'''
# 方法一：
i = 0
while True:
    speed = beat[i]  # 设置播放速度，speed值越小，等待时间越短，播放速度越快
    voice = tone[music[i]]  # 音调大小
    beeper.init(freq=voice)  # PWM初始化并设置PWM频率
    time.sleep(speed)  # 等待时间
    print(voice)  # 打印出ADC值
    i = i + 1  # i自增加1
    if i > len(music) - 1:  # 如果i的值大于music列表的长度
        beeper.deinit()   # 关闭PWM
        break  # 跳出循环
'''
# 方法二：
for i,j in zip(music,beat):
    if(music == []):  # 判断列表是否为空
        beeper.duty(0)  # 设置PWM波的占空比为0
    else:
        beeper.duty(512)  # 设置PWM波的占空比为512，即50%
        beeper.freq(tone[i-1])
    time.sleep(0.12*j)  # 控制节拍速度
    beeper.duty(0)
    time.sleep(0.15)

diagram.json

{
  "version": 1,
  "author": "Anonymous maker",
  "editor": "wokwi",
  "parts": [
    {
      "type": "wokwi-esp32-devkit-v1",
      "id": "esp",
      "top": 0,
      "left": 0,
      "attrs": { "env": "micropython-20220618-v1.19.1" }
    },
    {
      "type": "wokwi-buzzer",
      "id": "bz1",
      "top": -84.77,
      "left": 139.23,
      "attrs": { "volume": "0.1" }
    }
  ],
  "connections": [
    [ "esp:TX0", "$serialMonitor:RX", "", [] ],
    [ "esp:RX0", "$serialMonitor:TX", "", [] ],
    [ "esp:D22", "bz1:2", "red", [ "h0" ] ],
    [ "esp:GND.1", "bz1:1", "black", [ "h0" ] ]
  ]
}

实现效果，点击下方链接，打开网页查看：

ESP32音乐播放