关于Arduino Leonardo与ESP32-WROOM-32的串口通信

首先是硬件连接

ESP32-WROOM-32的串口有三个（serial，serial1，serial2），这里连的是serial

Arduino Leonardo的串口有两个，这里连的是serial1

 

ESP32-WROOM-32的LED的pin脚是 2
Arduino Leonardo的LED的pin脚是 13

Arduino 程序：

void setup() {
  Serial1.begin(115200);
  pinMode(13, OUTPUT);
}

void loop() {
  if (Serial1.available())
  {
    if (Serial1.read()=='a')
    {
      digitalWrite(13, HIGH);
      delay(1000);
      digitalWrite(13, LOW);
     }
   }
}

ESP32程序：

void setup() {
  Serial.begin(115200);
  pinMode(2, OUTPUT);
}

void loop() {
    digitalWrite(2, HIGH);
    Serial.write('a');
    delay(1000);
    digitalWrite(2, LOW);
}

下一步制作蓝牙键盘

具体原理如图：

Arduino 测试程序：

#include "Keyboard.h" 

char text;

void setup() {
  Keyboard.begin();
  Serial.begin(115200);
  Serial1.begin(115200);
  pinMode(13, OUTPUT);
}

void loop() {
  if (Serial1.available())
  {
    text = Serial1.read();
    Serial.print(text);
    if (text == 'a')
    {
      digitalWrite(13, HIGH);
      Serial.print(text);
      Keyboard.print(text);
      delay(1000);
      digitalWrite(13, LOW);
      }
    }
}

以下是完整版

ESP32蓝牙接收程序--2023/3/26

#include "BluetoothSerial.h"

#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif

BluetoothSerial SerialBT;

void setup() {
  pinMode(2, OUTPUT);
  Serial.begin(115200);
  Serial2.begin(115200);
  SerialBT.begin("ESP32test"); //Bluetooth device name
  Serial.println("The device started, now you can pair it with bluetooth!");
}

void loop() {
  if (Serial.available()) {
    SerialBT.write(Serial.read());
  }
  if (SerialBT.available()) {                                                            
    digitalWrite(2, HIGH);
    delay(100);
    Serial.write(SerialBT.read());
    Serial2.write(SerialBT.read());
    digitalWrite(2, LOW);
  }
  delay(20);
}

Arduino串口接收测试程序--2023/3/26

#include "Keyboard.h" 

char key;

void setup() {
  Keyboard.begin();
  Serial1.begin(115200);
  pinMode(13, OUTPUT);
}

void loop() {
  if (Serial1.available())
  {
    key = Serial1.read();
    digitalWrite(13, HIGH);
    Keyboard.print(key);
    digitalWrite(13, LOW);
    }
}

PC端Python发送程序--2023/3/26

import serial
import time


text = "nmcli con show 'ETH1'"
ser = serial.Serial('com11', 115200, parity='E', stopbits=1, bytesize=8, timeout=0.5)
for key in text:
    ser.write(key.encode("gbk"))
    time.sleep(0.2)
ser.close()