ESP32-C6 智能家居节点设计：Wi-Fi 6 与 BLE 5.2 应用方案

3.2 TWT 节能配置

// 在 setup() 中添加
esp_wifi_config_80211ax_twt(true, 2000); // 启用 TWT，2000ms 间隔

四、BLE 5.2 功能开发

4.1 BLE 服务构建

创建文件：ble_service.ino

#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>

#define SERVICE_UUID "4fafc201-1fb5-459e-8fcc-c5c9c331914b"
#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8"

BLECharacteristic *pCharacteristic;

void setup() {
  BLEDevice::init("SmartHome_Node");
  BLEServer *pServer = BLEDevice::createServer();
  BLEService *pService = pServer->createService(SERVICE_UUID);
  pCharacteristic = pService->createCharacteristic(
    CHARACTERISTIC_UUID,
    BLECharacteristic::PROPERTY_READ | BLECharacteristic::PROPERTY_WRITE
  );
  pCharacteristic->setValue("Node Ready");
  pService->start();
  BLEAdvertising *pAdvertising = pServer->getAdvertising();
  pAdvertising->setMinPreferred(0x06); // 优化连接间隔
  pAdvertising->start();
}

void loop() {
  // BLE 事件处理
  delay(2000);
}

4.2 2M PHY 高速模式

// 在 setup() 中添加
esp_ble_gap_set_prefer_phy(BLE_ADDR_TYPE_PUBLIC, ESP_BLE_GAP_PHY_2M, ESP_BLE_GAP_PHY_2M);

五、系统集成

5.1 传感器数据采集

使用 I2C 接口读取 SHT30 数据，ADC 采集光敏电阻信号，通过 Wi-Fi 或 BLE 传输至云端或手机 APP。

5.2 继电器控制代码

#define RELAY_PIN 12

void controlRelay(bool state) {
  digitalWrite(RELAY_PIN, state ? HIGH : LOW);
  // 状态同步更新
  pCharacteristic->setValue(state ? "ON" : "OFF");
}

六、云端交互

6.1 MQTT 连接实现

#include <PubSubClient.h>

WiFiClient espClient;
PubSubClient client(espClient);

void mqttConnect() {
  client.setServer("mqtt.broker.com", 1883);
  while (!client.connected()) {
    if (client.connect("ESP32C6_Node")) {
      client.subscribe("home/livingroom/light");
    }
  }
}

void callback(char* topic, byte* payload, unsigned int length) {
  if (strcmp(topic, "home/livingroom/light") == 0) {
    controlRelay(payload[0] == '1');
  }
}

七、部署优化

7.1 深度睡眠配置

// 进入睡眠模式
esp_sleep_enable_timer_wakeup(60 * 1000000); // 60 秒唤醒
esp_deep_sleep_start();

7.2 PCB 设计建议

• 天线区域保持干净，避免金属遮挡
• 电源电路需稳定滤波
• 传感器接口注意阻抗匹配
• 执行器驱动需隔离保护

八、成果测试

性能指标

场景测试：

1. 通过手机 APP 经 BLE 秒控灯光
2. 云端同时控制 20 个节点
3. 断电恢复后自动重连

技术图谱

• Communication: Wi-Fi 6 (OFDMA, TWT), BLE 5.2 (2M PHY, 广播扩展)
• Sensors: SHT30, GL5528
• Control: 继电器，PWM 调光
• Cloud: MQTT, HTTP API
• Power: 深度睡眠，动态调频