arduino ESP32 AndroidStudio BLE低功耗藍牙 物聯網
參考路徑: https://blog.csdn.net/qq_35174914/article/details/79328125
nodered開發:
1. node red sample節點前后端數據傳送
esp32采用的藍牙於普通的藍牙不同，是低功耗藍牙，手機用一般的藍牙代碼是連不上的。在本文中，不討論有關低功耗藍牙的內容，只說明如何實現ESP32與 Android手機間通過低功耗藍牙進行相互通信。
進入這個倉庫 https://github.com/nkolban/ESP32_BLE_Arduino 打包下載所有文件
將內容解壓后復制Arduino安裝目錄下的Libraries文件夾下
注意不要產生多級目錄
然后是Arduino代碼
#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>
#include <String.h>
BLECharacteristic *pCharacteristic;
bool deviceConnected = false;
uint8_t txValue = 0;
long lastMsg = 0;//存放時間的變量
String rxload="BlackWalnutLabs";
#define SERVICE_UUID "6E400001-B5A3-F393-E0A9-E50E24DCCA9E" // UART service UUID
#define CHARACTERISTIC_UUID_RX "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"
#define CHARACTERISTIC_UUID_TX "6E400003-B5A3-F393-E0A9-E50E24DCCA9E"
class MyServerCallbacks: public BLEServerCallbacks {
void onConnect(BLEServer* pServer) {
deviceConnected = true;
};
void onDisconnect(BLEServer* pServer) {
deviceConnected = false;
}
};
class MyCallbacks: public BLECharacteristicCallbacks {
void onWrite(BLECharacteristic *pCharacteristic) {
std::string rxValue = pCharacteristic->getValue();
if (rxValue.length() > 0) {
rxload="";
for (int i = 0; i < rxValue.length(); i++)
{
rxload +=(char)rxValue[i];
Serial.print(rxValue[i]);
}
Serial.println("");
}
}
};
void setupBLE(String BLEName){
const char *ble_name=BLEName.c_str();
BLEDevice::init(ble_name);
BLEServer *pServer = BLEDevice::createServer();
pServer->setCallbacks(new MyServerCallbacks());
BLEService *pService = pServer->createService(SERVICE_UUID);
pCharacteristic = pService->createCharacteristic(CHARACTERISTIC_UUID_TX,BLECharacteristic::PROPERTY_NOTIFY);
pCharacteristic->addDescriptor(new BLE2902());
BLECharacteristic *pCharacteristic = pService->createCharacteristic(CHARACTERISTIC_UUID_RX,BLECharacteristic::PROPERTY_WRITE);
pCharacteristic->setCallbacks(new MyCallbacks());
pService->start();
pServer->getAdvertising()->start();
Serial.println("Waiting a client connection to notify...");
}
void setup() {
Serial.begin(115200);
setupBLE("BlackWalnutLabs");//設置藍牙名稱
}
void loop() {
long now = millis();//記錄當前時間
if (now - lastMsg > 1000)
{//每隔1秒發一次信號
if (deviceConnected&&rxload.length()>0) {
String str=rxload;
const char *newValue=str.c_str();
pCharacteristic->setValue(newValue);
pCharacteristic->notify();
}
lastMsg = now;//刷新上一次發送數據的時間
}
}
上傳到ESP32上以后 進入APP搜索設備，連接設備
直接使用即可
附上AndroidStudio的代碼 https://pan.baidu.com/s/1ht9OwSW y51b
或者用C幣的。。。恩 http://download.csdn.net/download/qq_35174914/10252124
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原文鏈接：https://blog.csdn.net/qq_35174914/article/details/79328125