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一、前言

ESP32支持经典蓝牙和低功耗蓝牙（BLE）,经典蓝牙可在计算机上模拟出一个串口，使得ESP32可以以串口的方式和计算机通信。

二、代码

#include "BluetoothSerial.h"String device_name = "ESP32-BT-Slave";// Check if Bluetooth is available
#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run `make menuconfig` to and enable it
#endif// Check Serial Port Profile
#if !defined(CONFIG_BT_SPP_ENABLED)
#error Serial Port Profile for Bluetooth is not available or not enabled. It is only available for the ESP32 chip.
#endifBluetoothSerial SerialBT;void setup() {Serial.begin(115200);SerialBT.begin(device_name);  //Bluetooth device name//SerialBT.deleteAllBondedDevices(); // Uncomment this to delete paired devices; Must be called after beginSerial.printf("The device with name \"%s\" is started.\nNow you can pair it with Bluetooth!\n", device_name.c_str());
}void loop() {if (Serial.available()) {SerialBT.write(Serial.read());}if (SerialBT.available()) {Serial.write(SerialBT.read());}delay(20);
}

三、运行

将程序编译并下载到ESP32 开发板中，通过计算机的蓝牙连接ESP32 ，连接后计算机上会出现一个新的串口（我计算机上的是COM12），打开串口调试软件（这里是Putty）和Ardunio的串口监视器，两者可以收到来自对方的信息。