Arduino code MAX30100 and DS18B20 doesn't work

Projects Programming
1

hello guys, I'm working on a project that use MAX30100 pulse oximetry and DS18B20 Temperature sensor.
when I merged their codes together, MAX30100 doesn't work, but when I play each one they work probably. if anyone can help please.
this is the code while I'm a new user and can't upload it

#include <Wire.h>
#include "MAX30100_PulseOximeter.h"
#include <OneWire.h>
#include <DallasTemperature.h>
#define REPORTING_PERIOD_MS 1000
// Define to which pin of the Arduino the output of the TMP36 is connected:

PulseOximeter pox;
uint32_t tsLastReport = 0;

void onBeatDetected()
{
Serial.println("Beat!");
}

#define ONE_WIRE_BUS 2

OneWire oneWire(ONE_WIRE_BUS);

DallasTemperature sensors(&oneWire);

float Celcius=0;
void setup()
{
Serial.begin(9600);
Serial.print("Initializing pulse oximeter..");

// 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");
}
 pox.setIRLedCurrent(MAX30100_LED_CURR_7_6MA);

// Register a callback for the beat detection
pox.setOnBeatDetectedCallback(onBeatDetected);
  sensors.begin();

}

void loop()
{
// Make sure to call update as fast as possible

sensors.requestTemperatures();
Celcius=sensors.getTempCByIndex(0);

Serial.print(" C ");
Serial.println(Celcius);
pox.update();
if (millis() - tsLastReport > REPORTING_PERIOD_MS) {
Serial.print("Heart rate:");
Serial.print(pox.getHeartRate());
Serial.print("bpm / SpO2:");
Serial.print(pox.getSpO2());
Serial.println("%");

    tsLastReport = millis();
}

}

2

@ibrahimome, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with your project :wink: See About the Installation & Troubleshooting category.

Can you please read How to get the best out of this forum and apply what you read about code tags to the code in your post. Thanks.

3

Which MAX30100 library did you install? There are three under Library Manager:

MAX30100 by Connor Huffine
MAX30100_milan by OXullo Intersecans
MAX30100lib by OXullo Intersecans

4

which one is better?? i work on OXullo Library
but when I operate each sensor on his own they work, but when i combine the both sensors the MAX30100 Gives results (0) so it is only work without giving results

5

I have no reason to believe that any one library is better than the others. I just need to know which one you are using so I can try to help.

What does Serial Monitor say when you start your sketch?

6

i have tried them all, when i start the DS18B20 with MAX30100 serial monitor gives me a very good results for temperature, but!! the Heart Rate and SPo2 the results were zeros

7

sensors results

8

So it looks like you are getting temperature updates only twice a second. That means that something in your use of the temperature sensor is causing large delays. The pulse sensor can't see pulses if it only gets 2 samples per second.

Figure out how to avoid delays in the DS18B20 library. One option might be to read the temperature only once per minute.

9

ok i'll copy the whole code and kindly tell me what is the wrong.
there is no delays in the code!

10

#include <Wire.h>
#include "MAX30100_PulseOximeter.h"
#include <OneWire.h>
#include <DallasTemperature.h>
#define REPORTING_PERIOD_MS 1000
// Define to which pin of the Arduino the output of the TMP36 is connected:

PulseOximeter pox;
uint32_t tsLastReport = 0;

void onBeatDetected()
{
Serial.println("Beat!");
}

#define ONE_WIRE_BUS 2

OneWire oneWire(ONE_WIRE_BUS);

DallasTemperature sensors(&oneWire);

float Celcius=0;
void setup()
{
Serial.begin(9600);
Serial.print("Initializing pulse oximeter..");

// 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");
}
 pox.setIRLedCurrent(MAX30100_LED_CURR_7_6MA);

// Register a callback for the beat detection
pox.setOnBeatDetectedCallback(onBeatDetected);
  sensors.begin();

}

void loop()
{
// Make sure to call update as fast as possible

{
sensors.requestTemperatures();
Celcius=sensors.getTempCByIndex(0);

Serial.print(" C ");
Serial.println(Celcius);}
{ pox.update();
if (millis() - tsLastReport > REPORTING_PERIOD_MS) {
Serial.print("Heart rate:");
Serial.print(pox.getHeartRate());
Serial.print("bpm / SpO2:");
Serial.print(pox.getSpO2());
Serial.println("%");

    tsLastReport = millis();
}}

}

11

By default, 'waitForConversion' is true. When you call 'requestTemperatures' you get a delay
while waiting for the conversions to complete.

void DallasTemperature::requestTemperatures() 
{
  _wire->reset();
  _wire->skip();
  _wire->write(STARTCONVO, parasite);

  // ASYNC mode?
  if (!waitForConversion)
    return;

  blockTillConversionComplete(bitResolution);
}
12

ok, please can you make me a favor and write the whole code in order to try it please?

13

I'm afraid that's not how it works on this forum. It's not a free code writing service. If you want someone to write your code for you, head to the Jobs and Paid Consultancy Forum and negotiate a mutually agreeable price.

Alternately, you can see the WaitForConversion and WaitForConversion2 examples that come with the DallasTemperature library. They demonstrate how to use it in a non-blocking manner.

14

Ok, thanks for your kind assistance.

15

Hi! Did you solve the problem? I have the same issue and I need to solve it rapidly :frowning:

16

Unfortunately not yet🙁 and now I'm facing another problem with SIM800L EvB it's getting hot when i connect it and didn't register on the network ever🙁 although the whole connection is correct

17

:slightly_frowning_face: If you solve the problem of the Values please notify me. I’ll also do the same if i solve it before you.

18

Ok deal

19

Ok. What I realised after looking for the issue is that both sensors work without the esp8266wifiserver. After I put the code for the WiFi server,I get the results only for one sensors. After many tryings,I realised that If I comment the requestTemperatures() function,the max30100 works and the ds18b20 sensors shows only one temperatures which doesn’t change.
I think that it s a problem at requestTemperatures() function from Dallas library.
void DallasTemperature::requestTemperatures()
{
_wire->reset();
_wire->skip();
_wire->write(STARTCONVO, parasite);

// ASYNC mode?
if (!waitForConversion)
return;

blockTillConversionComplete(bitResolution);
}

Can anyone help,please?

20

Turn off the WaitForConversion option and use a millis() timer to fetch the temperature and kick off a new conversion at intervals no faster than the sensor can complete a conversion.

As @gfvalvo said back in reply 13: