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How to use nrf24 for BLE in esp32

http://esp32.io/viewtopic.php?f=19&t=23248

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How to use nrf24 for BLE in esp32

Posted: Mon Sep 13, 2021 1:20 pm
by brahmajit
I want to use the nrf24 for BLE, I have tried googling but can't find any meaningful result. If anyone have implemented this before or know of any library please share. I have tried the BTLE library but it is only for the AVR architecture.

Few of the sketches I've tried:

Code: Select all

#include <SPI.h>
#include <RF24.h>
#include <BTLE.h>

#define MOSI 34
#define MISO 38
#define SS 32
#define SCK 35
#define CE 37


RF24 radio(SS, 37);

BTLE btle(&radio);

void setup() {

  Serial.begin(115200);

  SPI.begin(SCK, MISO, MOSI, SS);//SCLK, MISO, MOSI, SS
//  pinMode(37, OUTPUT);
//  digitalWrite(37, LOW);
  while (!Serial) { }
  Serial.println("BTLE advertisement sender");

  btle.begin("foobar");
}

void loop() {
  btle.advertise(0, 0);
  btle.hopChannel();
  Serial.print(".");
}
After uploading the code nothing shows up in the nrf24's android/ios application

Code: Select all

#include "BLEDevice.h"
#include "BLEServer.h"-
#include "BLEUtils.h"
#include "BLE2902.h"

BLEServer *pServer = NULL;
BLECharacteristic * pTxCharacteristic;

#include <SPI.h>
#include <NRFLite.h> // Using NRFLite library

#define RADIO_TX_ID  13          // Transmitter Radio ID. Not use in this program
#define DESTINATION_RADIO_ID 18    // Our Receiving Radio ID.
#define RF_CHAN 108                //Using Radio Channel
#define PIN_RADIO_CE  37
#define PIN_RADIO_CSN 32
#define PIN_RADIO_MOSI  34
#define PIN_RADIO_MISO  38
#define PIN_RADIO_SCK  35
NRFLite _radio;

char strf1[10];
char strf2[10];
char strf3[10];
char strout1[40];
char strout2[40];
char strout3[40];
char strout4[40];
char strout5[40];
char strout6[40];
char strout7[40];
uint8_t BCdata[40];

//*********************************************************************
#define ainm  2.9298/4096.0  //Arduino ADC multiple factor from Vin
#define aoutm 2.6636/4096.0  //Arduino ADC multiple factor from Vout
#define at1m 1.0086/2048.0
#define at2m 1.0082/2048.0

#define v12M 3.246 // ADC multiple factor from v12
#define v8M 2.149  // ADC multiple factor from v8
#define v4M 1.08865  // ADC multiple factor from v4

#define PwmBaseFreq 20000    // base PWM frequency 31.25KHz
#define ILM 2.5686// ADC multiplication factor for average inductor current
//#define IinM 2.5339// ADC multiplication factor for average inductor current
#define IinM 2.614// ADC multiplication factor for average inductor current
#define IoutM 2.4578 //  ADC multiplication factor for output current
#define VintrM 4.8441  //  ADC multiplication factor for internal input voltage
#define V5M 1.9989  //  ADC multiplication factor Vcc, 5V



float ADC1b = 0.000125F;  // ADS1115 resolution at range of 4.096V.
// measured by Arduino ADC
float  faout;  // output voltages
float  fat1;   // temperature 1
float  fat2;   // temperature 2

float pwr_in;  // input power
float pwr_out;  // output power
float sum_pwr_in; // sum of 100 input power
float avg_pwr_in,avg_prv_pwr; // average input power and prv_pwr
float    pwr_bat; // battery power  pos= charging  neg= discharging
float    i_bat;  // current flows into battery, pos= charging  neg= discharging

// Measured by ADS1115A
float fVin; // solar input voltage
float fLi12;  // v12
float fLi8;   // v8
float fLi4;   // v4
// Measured by ADS1115B
float fIL; // inductor  current
float fIin;  // input current
float fIout;  // output current
float fVintr;   // internal input voltage
float fV5;   // Vcc

float vb12,vb8,vb4;  //  voltage across battery
float vbmis;   //voltage difference between battery

// int16_t junk=0;  // temperatory storage
 long freq = PwmBaseFreq;

float pwr_on_t;  // Total power on time in sec.

struct __attribute__((packed)) RadioPacket // Note the packed attribute.
{
// measured by Arduino ADC
uint8_t  RadioId;
int16_t  ain;  // sum of 4 output voltages
int16_t  aout;  // sum of 4 output voltages
int16_t  at1;   // sum of 2 temperature 1
int16_t  at2;   // sum of 2 temperature 2

// Measured by ADS1115A
int16_t Iin;   //  input current
int16_t Li12;  // v12
int16_t Li8;   // v8
int16_t Li4;   // v4
// Measured by ADS1115B
int16_t IL;   // Input current

int16_t Iout;  // Output current
int16_t Vintr;   // Internal input voltage
int16_t V5;   // Vcc
// PWM

int16_t PulseWidth;
uint8_t    err;       // error code  0= no error.
uint8_t  portb;//PORTB
uint8_t  portd; //PORTD  value
uint16_t SendCounts;  // number packages sent
};

//*********************************************************************
bool deviceConnected = false;
bool oldDeviceConnected = false;


// See the following for generating UUIDs:
// https://www.uuidgenerator.net/

#define SERVICE_UUID           "b20e2d8f-6ae0-4655-ad8d-4ad5a4d5e32e" // UART service UUID
#define CHARACTERISTIC_UUID_TX "c85392bc-558f-4f58-8942-ee4051a8a13c"
#define CHARACTERISTIC_UUID_RX "e1b6fed9-1ea4-4057-8311-46a52da9346a"

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) {
        Serial.println("*********");
        Serial.print("Received Value: ");
        for (int i = 0; i < rxValue.length(); i++)
          Serial.print(rxValue[i]);

        Serial.println();
        Serial.println("*********");
      }
    }
};
//******************************************************************
RadioPacket vm;
//******************************************************************

void setup() {
  Serial.begin(115200);
  Serial.println("Begin");
    // Configure SPI pins.
  SPI.begin(PIN_RADIO_SCK, PIN_RADIO_MISO, PIN_RADIO_MOSI, PIN_RADIO_CSN);

  // Indicate to NRFLite that it should not call SPI.begin() during initialization since it has already been done.
  uint8_t callSpiBegin = 0;
  if (!_radio.init(DESTINATION_RADIO_ID, PIN_RADIO_CE, PIN_RADIO_CSN, NRFLite::BITRATE250KBPS, RF_CHAN, callSpiBegin))  {
        Serial.println(" Initial communicate with radio fail");
        while (1); // Wait here forever.
       }
   else   Serial.println(" NRF24L01 Connected");

  // Create the BLE Device
  BLEDevice::init("Solar Charger");

  // Create the BLE Server
  pServer = BLEDevice::createServer();
  pServer->setCallbacks(new MyServerCallbacks());

  // Create the BLE Service
  BLEService *pService = pServer->createService(SERVICE_UUID);

  // Create a BLE Characteristic
  pTxCharacteristic = pService->createCharacteristic(
										CHARACTERISTIC_UUID_TX,
										BLECharacteristic::PROPERTY_NOTIFY
									);

  pTxCharacteristic->addDescriptor(new BLE2902());

  BLECharacteristic * pRxCharacteristic = pService->createCharacteristic(
											 CHARACTERISTIC_UUID_RX,
											BLECharacteristic::PROPERTY_WRITE
										);

  pRxCharacteristic->setCallbacks(new MyCallbacks());

  // Start the service
  pService->start();

  // Start advertising
  pServer->getAdvertising()->start();
  Serial.println("Waiting a client connection to notify...");
}

void loop() {
    while (_radio.hasData()) {
      _radio.readData(&vm); // Reading RF data.
     conv_float();  // converted to floating point measurements
     prn_results();    //print vm data


    if (deviceConnected) {
      for(int i=0;i<32;i++) BCdata[i] = strout1[i];
      pTxCharacteristic->setValue(BCdata, strlen(strout1));
      pTxCharacteristic->notify();
      for(int i=0;i<32;i++) BCdata[i] = strout2[i];
      pTxCharacteristic->setValue(BCdata, strlen(strout2));
      pTxCharacteristic->notify();
      for(int i=0;i<32;i++) BCdata[i] = strout3[i];
      pTxCharacteristic->setValue(BCdata, strlen(strout3));
      pTxCharacteristic->notify();
      for(int i=0;i<32;i++) BCdata[i] = strout4[i];
      pTxCharacteristic->setValue(BCdata, strlen(strout4));
      pTxCharacteristic->notify();
      for(int i=0;i<32;i++) BCdata[i] = strout5[i];
      pTxCharacteristic->setValue(BCdata, strlen(strout5));
      pTxCharacteristic->notify();
      for(int i=0;i<32;i++) BCdata[i] = strout6[i];
      pTxCharacteristic->setValue(BCdata, strlen(strout6));
      pTxCharacteristic->notify();
      for(int i=0;i<32;i++) BCdata[i] = strout7[i];
      pTxCharacteristic->setValue(BCdata, strlen(strout7));
      pTxCharacteristic->notify();
      BCdata[0] = 10; BCdata[1] = 0;
      pTxCharacteristic->setValue(BCdata, 1);
      pTxCharacteristic->notify();
	}

    // disconnecting
    if (!deviceConnected && oldDeviceConnected) {
        delay(500); // give the bluetooth stack the chance to get things ready
        pServer->startAdvertising(); // restart advertising
        Serial.println("start advertising");
        oldDeviceConnected = deviceConnected;
    }
    // connecting
    if (deviceConnected && !oldDeviceConnected) {
		// do stuff here on connecting
        oldDeviceConnected = deviceConnected;
    }

  }
}

//******************************************************************
void conv_float(){

  // convert all measurement to floating point
    fLi12 =v12M *ADC1b * vm.Li12;  // voltage at v12 reference to GND
    fLi8 = v8M *ADC1b * vm.Li8;  // voltage at v8 reference to GND
    fLi4 = v4M *ADC1b * vm.Li4;  // voltage at v4 reference to GND
    fIL = ILM *ADC1b * vm.IL;  // Inductor  current
    fIin = IinM *ADC1b * vm.Iin;  // Input  current
   if (fIL < 0.0) fIL = 0.0;
    fIout = IoutM *ADC1b * vm.Iout;  // output current
    if (fIout < 0.0) fIout = 0.0;
    fVintr = VintrM *ADC1b * vm.Vintr;  // Input voltage internal
    fV5 = V5M *ADC1b * vm.V5;    // Vcc=5V
//    fV5 = 4.9958;   // V5 fix due to fail in ADS1115, measured by DVM
    faout = aoutm*fV5*vm.aout;     // Output voltage
    fVin = ainm*fV5*vm.ain;     // Input voltage


    fat1 = at1m*fV5*vm.at1;        // temperature voltage at probe 1
    //convert voltage to temperature, equation is base on measurement.+/- 5C between 20C to 80C
    if (fat1 < 3.455)  fat1 = 25.5*fat1 -17.5;
    else if (fat1 < 4.095) fat1 = 39.2*fat1 -64.1;
         else fat1 = 75.8*fat1 -215.2;

    fat2 = at2m*fV5*vm.at2;        // temperature voltage at probe 2
    //convert voltage to temperature, equation is base on measurement.+/- 5C between 20C to 80C
    if (fat2 < 3.483)  fat2 = 25.2*fat2 -17.2;
    else if (fat2 < 4.143) fat2 = 37.9*fat2 -60.9;
         else fat2 = 921*fat2 -286.3;

    vb12 = fLi12 - fLi8;  // v12 Li battery voltage
    vb8 = fLi8 - fLi4;    // v8 Li battery voltage
    vb4 = fLi4;           // v4 Li battery voltage

    vbmis = max(vb12, max(vb8,vb4)) - min(vb12, min(vb8,vb4));  //max difference in Li battery voltages
 //   ind_dv = fIL-fLi12; // voltage across inductor
    i_bat = fIL -fIout;

 //   pwr_in = fVin*fIin;
 //   pwr_out = fLi12 * fIL;
//    sum_pwr_in+=pwr_in;*/
}
//***********************************************************************
//  print measurements
void prn_results() {

   sprintf(strout1, "RdID    %i  S# %i  Err %i\n", vm.RadioId,vm.SendCounts, vm.err);

   dtostrf(fLi12,1,3,strf1);
   dtostrf(fLi8,1,3,strf2);
   dtostrf(fLi4,1,3,strf3);
   sprintf(strout2, "V12 %s  V8 %s  V4 %s\n", strf1,strf2,strf3);

   dtostrf(fVin,1,3,strf1);
   dtostrf(fVintr,1,2,strf2);
   dtostrf(faout,1,2,strf3);
   sprintf(strout3, "Vin %s  Vx %s  Vo %s\n", strf1,strf2,strf3);

   dtostrf(vb12,1,3,strf1);
   dtostrf(vb8,1,3,strf2);
   dtostrf(vb4,1,3,strf3);
   sprintf(strout4, "B12  %s  B8 %s  B4 %s\n", strf1,strf2,strf3);

   dtostrf(fV5,1,3,strf2);
   dtostrf(vbmis,1,3,strf3);
   sprintf(strout5, "freq %i  V5 %s  Vm %s\n", freq,strf2,strf3);

   dtostrf(fIin,1,2,strf1);
   dtostrf(fIout,1,2,strf2);
   dtostrf(i_bat,1,2,strf3);
   sprintf(strout6, "Iin  %sA  Io %sA  Ib %sA\n", strf1,strf2,strf3);

   dtostrf(fat1,1,1,strf1);
   dtostrf(fat2,1,1,strf2);
   sprintf(strout7, "T1   %sC  T2 %sC  PW %i\n", strf1,strf2,vm.PulseWidth);
   Serial.print(strout1);
   Serial.print(strout2);
   Serial.print(strout3);
   Serial.print(strout4);
   Serial.print(strout5);
   Serial.print(strout6);
   Serial.print(strout7);// Serial.println(strlen(strout7));
   Serial.println();
}
//*****************************************
This code halt after "Initial communicate with radio fail", so guessing can't initialize the nrf24 module.

I've tested the module with other devices (arduinos) and it works, I'm using an esp32 pico mini 02 board and the arduino IDE.

Re: How to use nrf24 for BLE in esp32

Posted: Tue Sep 14, 2021 1:52 am
by ESP_Sprite
Aside from your problem ...why use a nrf24 when the ESP32 already can do BLE all on its own?
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