arduino ESP32 AndroidStudio BLE低功耗蓝牙 物联网
参考路径: https://blog.csdn.net/qq_35174914/article/details/79328125
nodered开发:
1. node red sample节点前后端数据传送
esp32采用的蓝牙于普通的蓝牙不同，是低功耗蓝牙，手机用一般的蓝牙代码是连不上的。在本文中，不讨论有关低功耗蓝牙的内容，只说明如何实现ESP32与 Android手机间通过低功耗蓝牙进行相互通信。
进入这个仓库 https://github.com/nkolban/ESP32_BLE_Arduino 打包下载所有文件
将内容解压后复制Arduino安装目录下的Libraries文件夹下
注意不要产生多级目录
然后是Arduino代码
#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;//存放时间的变量
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");//设置蓝牙名称
}
void loop() {
long now = millis();//记录当前时间
if (now - lastMsg > 1000)
{//每隔1秒发一次信号
if (deviceConnected&&rxload.length()>0) {
String str=rxload;
const char *newValue=str.c_str();
pCharacteristic->setValue(newValue);
pCharacteristic->notify();
}
lastMsg = now;//刷新上一次发送数据的时间
}
}
上传到ESP32上以后 进入APP搜索设备，连接设备
直接使用即可
附上AndroidStudio的代码 https://pan.baidu.com/s/1ht9OwSW y51b
或者用C币的。。。恩 http://download.csdn.net/download/qq_35174914/10252124
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原文链接：https://blog.csdn.net/qq_35174914/article/details/79328125
