第7篇:ESP32连接按钮点亮LED无源喇叭播放声音

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线路连接图：

示范代码：

PlatformIO.ini

; PlatformIO Project Configuration File
;
;   Build options: build flags, source filter
;   Upload options: custom upload port, speed and extra flags
;   Library options: dependencies, extra library storages
;   Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html

[env:esp32doit-devkit-v1]
platform = espressif32
board = esp32doit-devkit-v1
framework = arduino
upload_speed = 921600
upload_port = COM8
monitor_port = COM8

 main.cpp

#include 

// put function declarations here:
int myFunction(int, int);
int input_pin = 5;
int out_pin = 16;

void setup() {
  // put your setup code here, to run once:
   pinMode(input_pin,INPUT_PULLUP); //输入进行上拉，默认是高电平状态
   pinMode(out_pin,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(!digitalRead(input_pin))
  {
      digitalWrite(out_pin,HIGH);
      tone(13,1480,1);
  }
  else
  {
    digitalWrite(out_pin,LOW);
    tone(13,0,1);
  }
}

// put function definitions here:
int myFunction(int x, int y) {
  return x + y;
}

参考：

第7篇示范esp32连接按钮控制LED连接无源喇叭_哔哩哔哩_bilibili