Keyboard simulation is one of the commonly used features in development.Today, I used the ESP32 microcontroller in conjunction with the ESP32-BLE-Keyboard library to conduct a test and successfully implemented this feature.Now, I will organize and share my testing process with everyone, hoping it will be helpful.
1. Development IDE
I used Arduino IDE.
2. Development Chip
3. Library Import
The core library used here is ESP32-BLE-Keyboard, but it was found to be missing in local validation.
Therefore, it is necessary to load this library as a .zip file.
The content has been shared on the cloud disk:
Fanmu Technology Cloud Disk
http://clouddisk.fanmukeji.cn:8080/s/M0fo
The access password is: fanmukeji
After downloading, select 【Project】->【Import Library】->【Add .ZIP Library】
Select the downloaded zip library file.
4. Write Code
#include <BleKeyboard.h> // Import Bluetooth keyboard library
// Configure Bluetooth device name
BleKeyboard bleKeyboard(“ESP32_MediaKey”, “ESP32”, 100);
bool deviceConnected = false; // Mark device connection status
void setup() {
Serial.begin(115200);
Serial.println(“start ble keyboard…”);
bleKeyboard.begin();
Serial.println(“start ble keyboard finish”);
}
void loop() {
Serial.println(“Loop work”);
// Check device connection status
if (bleKeyboard.isConnected()) {
Serial.println(“bleKeyboard.isConnected()”);
if (!deviceConnected) {
Serial.println(“device is connected”);
deviceConnected = true;
}
// Check serial input commands
if (Serial.available()) {
char command = Serial.read();
// Print received command
Serial.print(“Received command: “);
Serial.println(command);
// Trigger by inputting letters via serial
if (command == ‘n’) {
Serial.println(“send next command”);
// Send “next” command
bleKeyboard.write(KEY_MEDIA_NEXT_TRACK);
}else if (command == ‘p’) {
Serial.println(“send previous command”);
// Send “previous” command
bleKeyboard.write(KEY_MEDIA_PREVIOUS_TRACK);
} else if (command == ‘s’) {
Serial.println(“send start command”);
// Send “play” command
bleKeyboard.write(KEY_MEDIA_PLAY_PAUSE);
}else if (command == ‘o’) {
Serial.println(“send stop command”);
bleKeyboard.write(KEY_MEDIA_STOP); // Send “stop” command
}else if (command == ‘u’) {
Serial.println(“send up command”);
bleKeyboard.write(KEY_UP_ARROW); // Send “up” command
}else if (command == ‘d’) {
Serial.println(“send down command”);
bleKeyboard.write(KEY_DOWN_ARROW); // Send “down” command
}else {
Serial.println(“Unknown command”);
// Additional commands can be added
// KEY_LEFT_CTRL
// KEY_LEFT_SHIFT
// KEY_LEFT_ALT
// KEY_LEFT_GUI
// KEY_RIGHT_CTRL
// KEY_RIGHT_SHIFT
// KEY_RIGHT_ALT
// KEY_RIGHT_GUI
// KEY_UP_ARROW
// KEY_DOWN_ARROW
// KEY_LEFT_ARROW
// KEY_RIGHT_ARROW
// KEY_BACKSPACE
// KEY_TAB
// KEY_RETURN
// KEY_ESC
// KEY_INSERT
// KEY_PRTSC
// KEY_DELETE
// KEY_PAGE_UP
// KEY_PAGE_DOWN
// KEY_HOME
// KEY_END
// KEY_CAPS_LOCK
// KEY_F1
// KEY_F2
// KEY_F3
// KEY_F4
// KEY_F5
// KEY_F6
// KEY_F7
// KEY_F8
// KEY_F9
// KEY_F10
// KEY_F11
// KEY_F12
// KEY_F13
// KEY_F14
// KEY_F15
// KEY_F16
// KEY_F17
// KEY_F18
// KEY_F19
// KEY_F20
// KEY_F21
// KEY_F22
// KEY_F23
// KEY_F24
// KEY_NUM_0
// KEY_NUM_1
// KEY_NUM_2
// KEY_NUM_3
// KEY_NUM_4
// KEY_NUM_5
// KEY_NUM_6
// KEY_NUM_7
// KEY_NUM_8
// KEY_NUM_9
// KEY_NUM_SLASH
// KEY_NUM_ASTERISK
// KEY_NUM_MINUS
// KEY_NUM_PLUS
// KEY_NUM_ENTER
// KEY_NUM_PERIOD
}
}
} else {
Serial.println(“bleKeyboard.disConnected()”);
// Reinitialize Bluetooth when the device is disconnected
if (deviceConnected) {
Serial.println(“device disconnected, restarting Bluetooth broadcast”);
deviceConnected = false;
}
//bleKeyboard.begin(); // Restart broadcast to allow reconnection
}
delay(5000); // Control sending frequency to avoid misoperation
}
5. Compile and Upload to Chip
After connecting to the ESP32 chip
Execute upload: (Note: At this time, the serial monitor needs to be closed to prevent the serial connection from failing)
After flashing, the chip starts up.
6. Debug Code
Connect the device with a mobile phone.
Open the serial monitor, 【note the port selection】
