BLE 配对通信 · 手机控制设备

// BLE_LED_Control.ino — 手机通过BLE控制LED #include <BLEDevice.h> #include <BLEServer.h> #include <BLEUtils.h> #include <BLE2902.h> #define SERVICE_UUID "4fafc201-1fb5-459e-8fcc-c5c9c331914b" #define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8" #define LED_PIN 23 class MyCallbacks : public BLECharacteristicCallbacks { void onWrite(BLECharacteristic *pChar) { String val = pChar->getValue().c_str(); Serial.printf("收到BLE指令: %s ", val.c_str()); if (val == "ON") { digitalWrite(LED_PIN, HIGH); pChar->setValue("LED=ON"); } else if (val == "OFF") { digitalWrite(LED_PIN, LOW); pChar->setValue("LED=OFF");} else { Serial.printf("未知指令: %s ", val.c_str()); } pChar->notify(); // 通知手机状态已变更 } }; void setup() { pinMode(LED_PIN, OUTPUT); BLEDevice.init("ESP32_LED_CTRL"); BLEServer *pServer = BLEDevice.createServer(); BLEService *pService = pServer->createService(SERVICE_UUID); BLECharacteristic *pChar = pService->createCharacteristic(CHARACTERISTIC_UUID, BLECharacteristic::PROPERTY_READ | BLECharacteristic::PROPERTY_WRITE | BLECharacteristic::PROPERTY_NOTIFY); pChar->setCallbacks(new MyCallbacks()); pChar->addDescriptor(new BLE2902()); // 启用Notify pService->start(); pServer->getAdvertising()->start(); } void loop() { delay(2000); }