Max30100 and BMP280 won't work together

Need Help With My Project
1

I’m using BMP280 and MAX30100 with XIAO ESP32 C3. Data for BMP280 shows on serial monitor and also on BLYNK but for MAX30100, it shows 0 for both values. They work separately but not togather.

here’s the library link for max30100 link

here’s the code:

* Fill-in information from Blynk Device Info here */
#define BLYNK_TEMPLATE_ID "  "
#define BLYNK_DEVICE_NAME "  "
#define BLYNK_AUTH_TOKEN " "


/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial


#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32_SSL.h>

#include <Wire.h>
#include "MAX30100_PulseOximeter.h"
#include <ErriezBMX280.h>

BlynkTimer timer;

#define REPORTING_PERIOD_MS     1000
#define SEA_LEVEL_PRESSURE_HPA  1026.25

// PulseOximeter is the higher level interface to the sensor
// it offers:
//  * beat detection reporting
//  * heart rate calculation
//  * SpO2 (oxidation level) calculation
PulseOximeter pox;
ErriezBMX280 bmx280 = ErriezBMX280(0x76);

float HR, SpO2;
float temp, alt;

uint32_t tsLastReport = 0;


//// Set password to "" for open networks.
char ssid[] = "Mughals";
char pass[] = "mughals2343";

// Callback (registered below) fired when a pulse is detected
void onBeatDetected()
{
  Serial.println("Beat!");
}

void setup()
{
  Serial.begin(115200);

  Serial.print("Initializing pulse oximeter..");
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  // Initialize the PulseOximeter instance
  // Failures are generally due to an improper I2C wiring, missing power supply
  // or wrong target chip
  if (!pox.begin()) {
Serial.println("FAILED");
for (;;);
  } else {
Serial.println("SUCCESS");
  }
  // Register a callback for the beat detection
  pox.setOnBeatDetectedCallback(onBeatDetected);
  pox.setIRLedCurrent(MAX30100_LED_CURR_7_6MA);

  Wire.begin();
  Wire.setClock(400000);

  // Initialize BMX280 sensor
  while (!bmx280.begin()) {
Serial.println(F("Error: Could not detect BMX280 sensor"));
delay(3000);
  }

  // Set sampling for BMX280 sensor
  bmx280.setSampling(BMX280_MODE_NORMAL, BMX280_SAMPLING_X16, BMX280_SAMPLING_X16, BMX280_SAMPLING_X16, BMX280_FILTER_X16, BMX280_STANDBY_MS_500);

  timer.setInterval(1000L, bmp);
  timer.setInterval(1000L, mx);
  delay(100);
}

void mx()
{
  HR = pox.getHeartRate();
  SpO2 = pox.getSpO2();


  if (millis() - tsLastReport > REPORTING_PERIOD_MS) {


Serial.print("Heart rate:");
Serial.print(HR);
Serial.print(" bpm / SpO2:");

Serial.print(SpO2);
Serial.println("%");

Blynk.virtualWrite(V1, SpO2);
Blynk.virtualWrite(V4, HR);


tsLastReport = millis();
  }


}


void bmp()
{

  temp = bmx280.readTemperature();
  alt = bmx280.readAltitude(SEA_LEVEL_PRESSURE_HPA);


  Serial.print("Temperature: ");
  Serial.print(temp);
  Serial.println(" C");


  Serial.print("Altitude:    ");
  Serial.print(alt);
  Serial.println(" m");

  Serial.println();

  Blynk.virtualWrite(V2, temp);
  Blynk.virtualWrite(V3, alt);


}

void loop()
{
  // Make sure to call update as fast as possible
  pox.update();
  Blynk.run();
  timer.run();

}

here’s the serial monitor output:
ESP-ROM:esp32c3-api1-20210207
Initializing pulse oximeter…[168] Connecting to Mughals
[3706] Connected to WiFi
[3706] IP: 192.168.10.8
[3706]
___ __ __
/ _ )/ /_ _____ / /__
/ _ / / // / _ / '/
///_, /////_
/__/ v1.2.0 on ESP32

 #StandWithUkraine    https://bit.ly/swua
[3707] Connecting to blynk.cloud:443
[4713] Certificate OK
[4907] Ready (ping: 193ms).
SUCCESS
Temperature: 33.16 C
Altitude:    302.69 m

Heart rate:0.00 bpm / SpO2:0.00%
Temperature: 33.16 C
Altitude:    302.62 m

Temperature: 33.15 C
Altitude:    302.57 m
2

What happens if you move your Blynk.begin command to the end of your void setup?

Also, have you tried changing the order in which your Max30100 and BMP280 library files are included in your sketch?.

Pete.

3

No change by trying both.

4

Have you tried some different libraries?

Pete.