Hallo,
ich möchte meinen ESP32 mittels BLE an eine Windows App verbinden. Das klappte gestern nur leider war das Gerät nur kurz nach dem Einschalten sichtbar und sendete den Wert nur 1x. Libary am ESP32 hatte ich die BLE Libary von Espressif genommen. ESP32 BLE Server and Client (Bluetooth Low Energy) | Random Nerd Tutorials Sensor will ich den MAX30102 verwenden:.
hier ein Beispielcode für den ESP laut Tutorial oben:
/*********
Rui Santos
Complete instructions at https://RandomNerdTutorials.com/esp32-ble-server-client/
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files.
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*********/
#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>
//Default Temperature is in Celsius
//Comment the next line for Temperature in Fahrenheit
#define temperatureCelsius
//BLE server name
#define bleServerName "BME280_ESP32"
Adafruit_BME280 bme; // I2C
float temp;
float tempF;
float hum;
// Timer variables
unsigned long lastTime = 0;
unsigned long timerDelay = 30000;
bool deviceConnected = false;
// See the following for generating UUIDs:
// https://www.uuidgenerator.net/
#define SERVICE_UUID "91bad492-b950-4226-aa2b-4ede9fa42f59"
// Temperature Characteristic and Descriptor
#ifdef temperatureCelsius
BLECharacteristic bmeTemperatureCelsiusCharacteristics("cba1d466-344c-4be3-ab3f-189f80dd7518", BLECharacteristic::PROPERTY_NOTIFY);
BLEDescriptor bmeTemperatureCelsiusDescriptor(BLEUUID((uint16_t)0x2902));
#else
BLECharacteristic bmeTemperatureFahrenheitCharacteristics("f78ebbff-c8b7-4107-93de-889a6a06d408", BLECharacteristic::PROPERTY_NOTIFY);
BLEDescriptor bmeTemperatureFahrenheitDescriptor(BLEUUID((uint16_t)0x2902));
#endif
// Humidity Characteristic and Descriptor
BLECharacteristic bmeHumidityCharacteristics("ca73b3ba-39f6-4ab3-91ae-186dc9577d99", BLECharacteristic::PROPERTY_NOTIFY);
BLEDescriptor bmeHumidityDescriptor(BLEUUID((uint16_t)0x2903));
//Setup callbacks onConnect and onDisconnect
class MyServerCallbacks: public BLEServerCallbacks {
void onConnect(BLEServer* pServer) {
deviceConnected = true;
};
void onDisconnect(BLEServer* pServer) {
deviceConnected = false;
}
};
void initBME(){
if (!bme.begin(0x76)) {
Serial.println("Could not find a valid BME280 sensor, check wiring!");
while (1);
}
}
void setup() {
// Start serial communication
Serial.begin(115200);
// Init BME Sensor
initBME();
// Create the BLE Device
BLEDevice::init(bleServerName);
// Create the BLE Server
BLEServer *pServer = BLEDevice::createServer();
pServer->setCallbacks(new MyServerCallbacks());
// Create the BLE Service
BLEService *bmeService = pServer->createService(SERVICE_UUID);
// Create BLE Characteristics and Create a BLE Descriptor
// Temperature
#ifdef temperatureCelsius
bmeService->addCharacteristic(&bmeTemperatureCelsiusCharacteristics);
bmeTemperatureCelsiusDescriptor.setValue("BME temperature Celsius");
bmeTemperatureCelsiusCharacteristics.addDescriptor(&bmeTemperatureCelsiusDescriptor);
#else
bmeService->addCharacteristic(&bmeTemperatureFahrenheitCharacteristics);
bmeTemperatureFahrenheitDescriptor.setValue("BME temperature Fahrenheit");
bmeTemperatureFahrenheitCharacteristics.addDescriptor(&bmeTemperatureFahrenheitDescriptor);
#endif
// Humidity
bmeService->addCharacteristic(&bmeHumidityCharacteristics);
bmeHumidityDescriptor.setValue("BME humidity");
bmeHumidityCharacteristics.addDescriptor(new BLE2902());
// Start the service
bmeService->start();
// Start advertising
BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
pAdvertising->addServiceUUID(SERVICE_UUID);
pServer->getAdvertising()->start();
Serial.println("Waiting a client connection to notify...");
}
void loop() {
if (deviceConnected) {
if ((millis() - lastTime) > timerDelay) {
// Read temperature as Celsius (the default)
temp = bme.readTemperature();
// Fahrenheit
tempF = 1.8*temp +32;
// Read humidity
hum = bme.readHumidity();
//Notify temperature reading from BME sensor
#ifdef temperatureCelsius
static char temperatureCTemp[6];
dtostrf(temp, 6, 2, temperatureCTemp);
//Set temperature Characteristic value and notify connected client
bmeTemperatureCelsiusCharacteristics.setValue(temperatureCTemp);
bmeTemperatureCelsiusCharacteristics.notify();
Serial.print("Temperature Celsius: ");
Serial.print(temp);
Serial.print(" ºC");
#else
static char temperatureFTemp[6];
dtostrf(tempF, 6, 2, temperatureFTemp);
//Set temperature Characteristic value and notify connected client
bmeTemperatureFahrenheitCharacteristics.setValue(temperatureFTemp);
bmeTemperatureFahrenheitCharacteristics.notify();
Serial.print("Temperature Fahrenheit: ");
Serial.print(tempF);
Serial.print(" ºF");
#endif
//Notify humidity reading from BME
static char humidityTemp[6];
dtostrf(hum, 6, 2, humidityTemp);
//Set humidity Characteristic value and notify connected client
bmeHumidityCharacteristics.setValue(humidityTemp);
bmeHumidityCharacteristics.notify();
Serial.print(" - Humidity: ");
Serial.print(hum);
Serial.println(" %");
lastTime = millis();
}
}
}
Hier haben wir den MAX30102 Beispielcode: DFRobot_MAX30102/basicRead.ino at master · DFRobot/DFRobot_MAX30102 (github.com)
Ich versuche es gleich nochmal, aber mal vorweg, kann mir da jemand helfen? Gibt es vielleicht bessere Tutorials oder wäre eine andere Libary empfehlenswerter? Ein code ohne Pfeile wäre mir schonmal Willkommen. 