将adc转换的数据通过GATT发送给手机端

首先，您需要在您的蓝牙设备上实现GATT服务器来发送数据。以下是一个基本的示例：

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

#define SERVICE_UUID "your_service_uuid_here"
#define CHARACTERISTIC_UUID "your_characteristic_uuid_here"

BLEServer* pServer = NULL;
BLECharacteristic* pCharacteristic = NULL;
bool deviceConnected = false;

class MyServerCallbacks: public BLEServerCallbacks {
    void onConnect(BLEServer* pServer) {
      deviceConnected = true;
    };

    void onDisconnect(BLEServer* pServer) {
      deviceConnected = false;
    }
};

void setup() {
  BLEDevice::init("YourDeviceName");
  pServer = BLEDevice::createServer();
  pServer->setCallbacks(new MyServerCallbacks());

  BLEService *pService = pServer->createService(SERVICE_UUID);

  pCharacteristic = pService->createCharacteristic(
                       CHARACTERISTIC_UUID,
                       BLECharacteristic::PROPERTY_READ |
                       BLECharacteristic::PROPERTY_NOTIFY
                     );

  pCharacteristic->addDescriptor(new BLE2902());

  pService->start();

  BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
  pAdvertising->addServiceUUID(SERVICE_UUID);
  pAdvertising->setScanResponse(true);
  pAdvertising->setMinPreferred(0x06);  // set value to 0x00 to not advertise this parameter
  pAdvertising->setMinPreferred(0x12);
  BLEDevice::startAdvertising();
}

void loop() {
  if (deviceConnected) {
    // generate ADC data and send it as notification
    uint16_t adcData = analogRead(A0);

    pCharacteristic->setValue(&adcData, sizeof(adcData));
    pCharacteristic->notify();
  }

  delay(1000);
}

在这个示例中，我们创建了一个GATT服务器，并在其中添加了一个特征，以便读取和通知。我们还添加了一个设备连接回调函数，以便在设备连接和断开连接时更新设备连接状态。在loop函数中，我们生成ADC数据并将其设置为特征值，然后通过调用notify函数将其发送给已连接的设备。

注意，您需要将`your_service_uuid_here`和`your_characteristic_uuid_here`替换为您自己的UUID。