我正在尝试通过蓝牙(BLE)将数据从我的 android 应用程序发送到 esp32，但我找不到正确的方法。我现在能做的就是扫描并找到 ble 设备。我的 arduino 代码正在按我的意愿工作(它可以正确接收数据)，因为我使用了另一个应用程序，它让我可以将数据发送到 ble 设备，所以我知道 arduino 代码很好。
我已经在这里搜索了几天并用谷歌搜索了如何实现它，但我仍然坚持下去。这是我现在的代码:
扫描器:
class BluetoothFragment : Fragment() {
private lateinit var binding: FragmentBluetoothBinding
private var list : MutableList<BluetoothDevice> = ArrayList()
private lateinit var bluetoothAdapter : BluetoothAdapter
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
Log.d("DeviceListActivity", "onCreate()")
return inflater.inflate(R.layout.fragment_bluetooth, container, false)
}
// TODO: 19/05/2021 implementar listener en el recycler view para crear la conexión con el ble
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
binding = FragmentBluetoothBinding.bind(view)
if (ContextCompat.checkSelfPermission(
requireContext(),
Manifest.permission.ACCESS_COARSE_LOCATION
) != PackageManager.PERMISSION_GRANTED
) {
val permissions = arrayOf(
android.Manifest.permission.ACCESS_COARSE_LOCATION,
)
ActivityCompat.requestPermissions(requireActivity(), permissions, 0)
}
setRecyclerView(list)
}
private val bleScanner = object :ScanCallback() {
override fun onScanResult(callbackType: Int, result: ScanResult?) {
super.onScanResult(callbackType, result)
Log.d("pepe","onScanResult: ${result?.device?.address} - ${result?.device?.name}")
if(result?.device?.name?.isNotEmpty() == true){
var bluetoothDevice = result?.device?.name?.let { BluetoothDevice(it) }
if (bluetoothDevice != null) {
list.add(bluetoothDevice)
bluetoothAdapter.notifyDataSetChanged()
}
}
}
override fun onBatchScanResults(results: MutableList<ScanResult>?) {
super.onBatchScanResults(results)
Log.d("DeviceListActivity","onBatchScanResults:${results.toString()}")
}
override fun onScanFailed(errorCode: Int) {
super.onScanFailed(errorCode)
Log.d("DeviceListActivity", "onScanFailed: $errorCode")
}
}
private val bluetoothLeScanner: BluetoothLeScanner
get() {
val bluetoothManager = requireActivity().getSystemService(Context.BLUETOOTH_SERVICE) as BluetoothManager
val bluetoothAdapter = bluetoothManager.adapter
return bluetoothAdapter.bluetoothLeScanner
}
class ListDevicesAdapter(context: Context?, resource: Int) : ArrayAdapter<String>(context!!, resource)
override fun onStart() {
Log.d("DeviceListActivity","onStart()")
super.onStart()
bluetoothLeScanner.startScan(bleScanner)
}
override fun onStop() {
bluetoothLeScanner.stopScan(bleScanner)
super.onStop()
}
private fun setRecyclerView(allCategories: List<BluetoothDevice>) {
val layoutManager: RecyclerView.LayoutManager = LinearLayoutManager(context)
binding.rvBluetooth.layoutManager = layoutManager
bluetoothAdapter = BluetoothAdapter(allCategories)
binding.rvBluetooth.adapter = bluetoothAdapter
}
}
#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"
// Motor 1
int motor1Pin1 = 23;
int motor1Pin2 = 22;
int enable1Pin = 21;
// Motor 2
int motor2Pin1 = 18;
int motor2Pin2 = 19;
int enable2Pin = 5;
const int freq = 30000;
const int pwmChannel = 0;
const int resolution = 8;
int dutyCycle = 200;
class MyCallbacks: public BLECharacteristicCallbacks {
void onWrite(BLECharacteristic *pCharacteristic) {
std::string value = pCharacteristic->getValue();
if (value.length() > 0) {
if (value[0] == '1') {
dutyCycle = 200;
Serial.println("Moving Forward");
digitalWrite(motor1Pin1, LOW);
digitalWrite(motor1Pin2, HIGH);
digitalWrite(motor2Pin1, LOW);
digitalWrite(motor2Pin2, HIGH);
while (dutyCycle <= 255) {
ledcWrite(pwmChannel, dutyCycle);
dutyCycle = dutyCycle + 5;
delay(500);
}
}
if (value[0] == '4') {
dutyCycle = 200;
Serial.println("Moving Backwards");
digitalWrite(motor1Pin1, HIGH);
digitalWrite(motor1Pin2, LOW);
digitalWrite(motor2Pin1, HIGH);
digitalWrite(motor2Pin2, LOW);
while (dutyCycle <= 255) {
ledcWrite(pwmChannel, dutyCycle);
dutyCycle = dutyCycle + 5;
delay(500);
}
}
if (value[0] == '2') {
dutyCycle = 100;
Serial.println("Motor right");
digitalWrite(motor1Pin1, LOW);
digitalWrite(motor1Pin2, HIGH);
digitalWrite(motor2Pin1, HIGH);
digitalWrite(motor2Pin2, LOW);
}
if (value[0] == '3') {
dutyCycle = 100;
Serial.println("Motor left");
digitalWrite(motor1Pin1, HIGH);
digitalWrite(motor1Pin2, LOW);
digitalWrite(motor2Pin1, LOW);
digitalWrite(motor2Pin2, HIGH);
}
if (value[0] == '0') {
Serial.println("Motor stopped");
digitalWrite(motor1Pin1, LOW);
digitalWrite(motor1Pin2, LOW);
digitalWrite(motor2Pin1, LOW);
digitalWrite(motor2Pin2, LOW);
}
}
}
};
void setup() {
Serial.begin(115200);
BLEDevice::init("Andruino");
BLEServer *pServer = BLEDevice::createServer();
BLEService *pService = pServer->createService(SERVICE_UUID);
BLECharacteristic *pCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID,
BLECharacteristic::PROPERTY_WRITE
);
pCharacteristic->setCallbacks(new MyCallbacks());
pService->start();
BLEAdvertising *pAdvertising = pServer->getAdvertising();
pAdvertising->start();
pinMode(motor1Pin1, OUTPUT);
pinMode(motor1Pin2, OUTPUT);
pinMode(enable1Pin, OUTPUT);
pinMode(motor2Pin1, OUTPUT);
pinMode(motor2Pin2, OUTPUT);
pinMode(enable2Pin, OUTPUT);
ledcSetup(pwmChannel, freq, resolution);
ledcAttachPin(enable1Pin, pwmChannel);
ledcAttachPin(enable2Pin, pwmChannel);
ledcWrite(pwmChannel, dutyCycle);
}
void loop() {
}
最佳答案
为了使这项工作正常进行，如果我是您，我会执行以下操作:-
A部分 :让这个与现有的 Android 应用程序一起工作(例如 nRF Connect - 也许你已经完成了这部分)
如果上面的部分对您来说是新的，请查看下面的链接。如果您已经成功完成上述所有操作，请转到 B 部分:-
B部分 :使用您的 Android 应用程序使其正常工作:-
如果所有这些都到位但仍然无法正常工作，请检查以下事项:-
您可以在以下链接中找到有关上述步骤的示例和说明:-
关于Android + ESP32 通过蓝牙 (BLE) 发送数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/67742410/