目录
1.简介
这两天一直看见各种客制化键盘的制作视频，搞得我也想做一个玩玩，芯片我有四种选择：
（1）Atmega32U4（USB）
（2）STM32F4(USB)
（3）ESP32（蓝牙）
（4）NRF51822（蓝牙）
现在乐鑫已经推出了 ESP32-S2，此款芯片支持了USB模拟功能，如果加上它的蓝牙键盘模拟功能，我们很容易只做一款蓝牙+USB+WIFI的客制化键盘，但这些都等待 ESP32-S2 开发环境的完善之后再玩吧~
2.硬件平台
安信可 NODEMCU-32S 开发板：
3.软件平台
Arduino (1.8.10) 或 VScode 环境下 PlatformIO 插件
4.库文件
4.1 ESP32_BLE_Arduino
ESP蓝牙驱动库，地址：https://github.com/nkolban/ESP32_BLE_Arduino
4.2 ESP32-BLE-Keyboard
ESP32键盘模拟库，依赖于ESP32_BLE_Arduino这个库，地址：https://github.com/T-vK/ESP32-BLE-Keyboard
5.示例程序
代码：
/**
* 时间：2020/5/18
* 作者：刘泽文
* 功能：使用ESP32的蓝牙功能模拟蓝牙键盘
*/
#include <BleKeyboard.h>
#include <WiFi.h>
BleKeyboard bleKeyboard("ESP32蓝牙键盘","Espressif",100);//其中“ESP32蓝牙键盘”为键盘名称；"Espressif"为制造商
void setup() {
Serial.begin(115200);
Serial.println("Starting BLE work!");
bleKeyboard.begin();
}
void loop() {
if(bleKeyboard.isConnected()) {
//多媒体测试
Serial.println("Sending Play/Pause media key...");
bleKeyboard.write(KEY_MEDIA_PLAY_PAUSE);
delay(1000);
//Ctrl+Alt+Delete任务管理器，并进行锁屏操作
Serial.println("Sending Ctrl+Alt+Delete...");
bleKeyboard.press(KEY_LEFT_CTRL);
bleKeyboard.press(KEY_LEFT_ALT);
bleKeyboard.press(KEY_DELETE);
delay(100);
bleKeyboard.releaseAll();
//输入密码并开机
Serial.println("下面填入你的开机密码↓");
bleKeyboard.print("--你的开机密码，注意大小写--");
delay(100);
Serial.println("Enter");
bleKeyboard.write(KEY_RETURN);
}
Serial.println("Waiting 5 seconds...");
delay(5000);
}6.配对&测试
给你的ESP32开发板插上电，打开你的笔记本电脑->打开蓝牙->添加蓝牙或设备->鼠标、键盘类，你将会看到名为“ESP32蓝牙键盘”的设备，点击即可连接。然后打开你电脑上的音乐软件播放歌曲。
接下来，你的笔记本将会一直重复 停止播放音乐+锁屏+解锁+开始播放音乐 的操作~，如果想停下，请直接关闭笔记本的蓝牙，或拔掉开发板。
7.提升部分
使用旋转编码器控制电脑、手机、平板的音量
/**
* This example turns the ESP32 into a Bluetooth LE keyboard that writes the words, presses Enter, presses a media key and then Ctrl+Alt+Delete
*/
#include <BleKeyboard.h>
#include <WiFi.h>
#include <math.h>
#define interruptPin_A 21 //A相
#define interruptPin_B 22 //B相
#define interruptPin_SW 23 //按键
#define LED 2 //LED
#define VOLUME_UP 1
#define VOLUME_DOWN 2
#define BRIGHT_UP 3
#define BRIGHT_DOWN 4
const MediaKeyReport KEY_MEDIA_BRIGHT_UP = {32, 0};
const MediaKeyReport KEY_MEDIA_BRIGHT_DOWN = {64, 0};
BleKeyboard bleKeyboard;
bool mode = 1;
uint8_t type = 0;
void handleInterrupt_A() {
if (digitalRead(interruptPin_A) == LOW){
if (digitalRead(interruptPin_B) == LOW){//反转
if(mode)
type = VOLUME_DOWN;
else
type = BRIGHT_DOWN;
}
else if (digitalRead(interruptPin_B) == HIGH){//正转
if(mode)
type = VOLUME_UP;
else
type = BRIGHT_UP;
}
//while(!digitalRead(interruptPin_A));
}
else if(digitalRead(interruptPin_A) == HIGH){//正转
if (digitalRead(interruptPin_B) == LOW){
if(mode)
type = VOLUME_UP;
else
type = BRIGHT_UP;
}
else if (digitalRead(interruptPin_B) == HIGH){//反转
if(mode)
type = VOLUME_DOWN;
else
type = BRIGHT_DOWN;
}
//while(digitalRead(interruptPin_A));
}
}
void handleInterrupt_SW()
{
mode = !mode;
digitalWrite(LED,!digitalRead(LED));
while(!digitalRead(interruptPin_SW));
}
void setup() {
Serial.begin(115200);
Serial.println("Starting BLE work!");
pinMode(interruptPin_A, INPUT_PULLUP);
pinMode(interruptPin_B, INPUT_PULLUP);
pinMode(interruptPin_SW, INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(interruptPin_A), handleInterrupt_A, CHANGE);
attachInterrupt(digitalPinToInterrupt(interruptPin_SW), handleInterrupt_SW, FALLING);
pinMode(LED, OUTPUT);
digitalWrite(LED,LOW);
bleKeyboard.begin();
}
void loop() {
if(bleKeyboard.isConnected()) {
switch (type)
{
case VOLUME_UP:
bleKeyboard.write(KEY_MEDIA_VOLUME_UP);
bleKeyboard.write(KEY_MEDIA_VOLUME_UP);
type = 0;
break;
case VOLUME_DOWN:
bleKeyboard.write(KEY_MEDIA_VOLUME_DOWN);
bleKeyboard.write(KEY_MEDIA_VOLUME_DOWN);
type = 0;
break;
case BRIGHT_UP:
bleKeyboard.write(KEY_MEDIA_BRIGHT_UP);
bleKeyboard.write(KEY_MEDIA_BRIGHT_UP);
type = 0;
break;
case BRIGHT_DOWN:
bleKeyboard.write(KEY_MEDIA_BRIGHT_DOWN);
bleKeyboard.write(KEY_MEDIA_BRIGHT_DOWN);
type = 0;
break;
default:
break;
}
}
delay(50);
}