• Home
  • Archive
  • Tools
  • Contact Us

The Customize Windows

Technology Journal

  • Cloud Computing
  • Computer
  • Digital Photography
  • Windows 7
  • Archive
  • Cloud Computing
  • Virtualization
  • Computer and Internet
  • Digital Photography
  • Android
  • Sysadmin
  • Electronics
  • Big Data
  • Virtualization
  • Downloads
  • Web Development
  • Apple
  • Android
Advertisement
You are here: Home » ESP32 MAX30102 Pulse Oximeter Code

By Abhishek Ghosh September 23, 2020 9:59 am Updated on September 23, 2020

ESP32 MAX30102 Pulse Oximeter Code

Advertisement

In the previous guide of MAX30102, we have shown a test code with the MAX30102 module build/sold by Maker Focus mounted on a MH-ET LIVE breakout board. Our two challenges are – ESP32 is not exactly same as Arduino UNO and the good looking MH-ET LIVE breakout board is not same as the MAX30102 module sold by Sparkfun. As we commonly use the MAX30102 sensor library by Sparkfun, we need to guess which code evokes IR and RED LED. The MAX30105 module has a GREEN LED as well.

 

Tweak the MAX30102 MH-ET LIVE breakout board

 

You’ll notice that the back of MAX30102 MH-ET LIVE breakout board has PCB jumper at it’s back. The jumpers are like :

1V8
|
|
|
3.3V

Advertisement

---

MAX30102 MH-ET LIVE breakout

You have to solder the 3.3v with the middle one. After soldering, test with a multimeter (resistance measurement settings) whether they are connected and also avoid to short-circuit with 1V8. This is not just easy work unless you are used with soldering PCB mounted components.

Secondly, put the MAX30102 MH-ET LIVE breakout board inside a thing plastic bag. I have used the plastic cover of cigarette pack as a “bag” of the MAX30102 MH-ET LIVE breakout board. A lot of box packages have such thin plastic wraps. Wrap of a cigarette pack is an example of how thin it should be.

Third, as the pressure determines the Gamma value, you should not apply too much pressure with your finger (on the sensors) to avoid false high reading. You can use a tape, or velcro or a cloth clip to apply uniform pressure.

Forth, the code is designed to start after pressing the reset button of ESP32. Also, it will halt after a period of sampling and upon error. You need to press reset button of ESP32 in such case.

Fifth, open the serial plotter of Arduino IDE after some seconds of attaching the sensor. Close the serial plotter of Arduino IDE after it faces a halt, press reset button of ESP32, wait for a while and then open the serial plotter of Arduino IDE.

 

Working Code for Local Use

 

The below code is for testing with Arduino IDE’s plotter. Thankfully, I found that coniferconifer did the works we required for building a basic pulse oximeter with ESP32 and MAX30102 (MH-ET LIVE breakout board). I can tell you that finding that code was not closest to easy but he did the best work of working with all possible projects so far I know.

The green plotting line is of SpO2.

ESP32 MAX30102 Pulse Oximeter Code Plotter

Vim
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
#include <Wire.h>
#include "MAX30105.h" //sparkfun MAX3010X library
MAX30105 particleSensor;
 
//#define MAX30105 //if you have Sparkfun's MAX30105 breakout board , try #define MAX30105
 
#define USEFIFO
void setup()
{
  Serial.begin(115200);
  Serial.println("Initializing...");
 
  // Initialize sensor
  if (!particleSensor.begin(Wire, I2C_SPEED_FAST)) //Use default I2C port, 400kHz speed
  {
    Serial.println("MAX30102 was not found. Please check wiring/power/solder jumper at MH-ET LIVE MAX30102 board. ");
    while (1);
  }
 
  //Setup to sense a nice looking saw tooth on the plotter
  byte ledBrightness = 0x7F; //Options: 0=Off to 255=50mA
  byte sampleAverage = 4; //Options: 1, 2, 4, 8, 16, 32
  byte ledMode = 2; //Options: 1 = Red only, 2 = Red + IR, 3 = Red + IR + Green
  //Options: 1 = IR only, 2 = Red + IR on MH-ET LIVE MAX30102 board
  int sampleRate = 200; //Options: 50, 100, 200, 400, 800, 1000, 1600, 3200
  int pulseWidth = 411; //Options: 69, 118, 215, 411
  int adcRange = 16384; //Options: 2048, 4096, 8192, 16384
  // Set up the wanted parameters
  particleSensor.setup(ledBrightness, sampleAverage, ledMode, sampleRate, pulseWidth, adcRange); //Configure sensor with these settings
}
double avered = 0; double aveir = 0;
double sumirrms = 0;
double sumredrms = 0;
int i = 0;
int Num = 100;//calculate SpO2 by this sampling interval
 
double ESpO2 = 95.0;//initial value of estimated SpO2
double FSpO2 = 0.7; //filter factor for estimated SpO2
double frate = 0.95; //low pass filter for IR/red LED value to eliminate AC component
#define TIMETOBOOT 3000 // wait for this time(msec) to output SpO2
#define SCALE 88.0 //adjust to display heart beat and SpO2 in the same scale
#define SAMPLING 5 //if you want to see heart beat more precisely , set SAMPLING to 1
#define FINGER_ON 30000 // if red signal is lower than this , it indicates your finger is not on the sensor
#define MINIMUM_SPO2 80.0
void loop()
{
 
  uint32_t ir, red , green;
  double fred, fir;
  double SpO2 = 0; //raw SpO2 before low pass filtered
 
#ifdef USEFIFO
  particleSensor.check(); //Check the sensor, read up to 3 samples
 
  while (particleSensor.available()) {//do we have new data
#ifdef MAX30105
   red = particleSensor.getFIFORed(); //Sparkfun's MAX30105
    ir = particleSensor.getFIFOIR();  //Sparkfun's MAX30105
#else
    red = particleSensor.getFIFOIR(); //why getFOFOIR output Red data by MAX30102 on MH-ET LIVE breakout board
    ir = particleSensor.getFIFORed(); //why getFIFORed output IR data by MAX30102 on MH-ET LIVE breakout board
#endif
    i++;
    fred = (double)red;
    fir = (double)ir;
    avered = avered * frate + (double)red * (1.0 - frate);//average red level by low pass filter
    aveir = aveir * frate + (double)ir * (1.0 - frate); //average IR level by low pass filter
    sumredrms += (fred - avered) * (fred - avered); //square sum of alternate component of red level
    sumirrms += (fir - aveir) * (fir - aveir);//square sum of alternate component of IR level
    if ((i % SAMPLING) == 0) {//slow down graph plotting speed for arduino Serial plotter by thin out
      if ( millis() > TIMETOBOOT) {
        float ir_forGraph = (2.0 * fir - aveir) / aveir * SCALE;
        float red_forGraph = (2.0 * fred - avered) / avered * SCALE;
        //trancation for Serial plotter's autoscaling
        if ( ir_forGraph > 100.0) ir_forGraph = 100.0;
        if ( ir_forGraph < 80.0) ir_forGraph = 80.0;
        if ( red_forGraph > 100.0 ) red_forGraph = 100.0;
        if ( red_forGraph < 80.0 ) red_forGraph = 80.0;
        //        Serial.print(red); Serial.print(","); Serial.print(ir);Serial.print(".");
        if (ir < FINGER_ON) ESpO2 = MINIMUM_SPO2; //indicator for finger detached
        Serial.print(ir_forGraph); // to display pulse wave at the same time with SpO2 data
        Serial.print(","); Serial.print(red_forGraph); // to display pulse wave at the same time with SpO2 data
        Serial.print(",");
        Serial.print(ESpO2); //low pass filtered SpO2
        Serial.print(","); Serial.print(85.0); //reference SpO2 line
        Serial.print(","); Serial.print(90.0); //warning SpO2 line
        Serial.print(","); Serial.print(95.0); //safe SpO2 line
        Serial.print(","); Serial.println(100.0); //max SpO2 line
      }
    }
    if ((i % Num) == 0) {
      double R = (sqrt(sumredrms) / avered) / (sqrt(sumirrms) / aveir);
      // Serial.println(R);
      SpO2 = -23.3 * (R - 0.4) + 100; //http://ww1.microchip.com/downloads/jp/AppNotes/00001525B_JP.pdf
      ESpO2 = FSpO2 * ESpO2 + (1.0 - FSpO2) * SpO2;//low pass filter
      //  Serial.print(SpO2);Serial.print(",");Serial.println(ESpO2);
      sumredrms = 0.0; sumirrms = 0.0; i = 0;
      break;
    }
    particleSensor.nextSample(); //We're finished with this sample so move to next sample
    //Serial.println(SpO2);
  }
#else
 
  while (1) {//do we have new data
#ifdef MAX30105
   red = particleSensor.getRed();  //Sparkfun's MAX30105
    ir = particleSensor.getIR();  //Sparkfun's MAX30105
#else
    red = particleSensor.getIR(); //why getFOFOIR outputs Red data by MAX30102 on MH-ET LIVE breakout board
    ir = particleSensor.getRed(); //why getFIFORed outputs IR data by MAX30102 on MH-ET LIVE breakout board
#endif
    i++;
    fred = (double)red;
    fir = (double)ir;
    avered = avered * frate + (double)red * (1.0 - frate);//average red level by low pass filter
    aveir = aveir * frate + (double)ir * (1.0 - frate); //average IR level by low pass filter
    sumredrms += (fred - avered) * (fred - avered); //square sum of alternate component of red level
    sumirrms += (fir - aveir) * (fir - aveir);//square sum of alternate component of IR level
    if ((i % SAMPLING) == 0) {//slow down graph plotting speed for arduino IDE toos menu by thin out
      //#if 0
      if ( millis() > TIMETOBOOT) {
        float ir_forGraph = (2.0 * fir - aveir) / aveir * SCALE;
        float red_forGraph = (2.0 * fred - avered) / avered * SCALE;
        //trancation for Serial plotter's autoscaling
        if ( ir_forGraph > 100.0) ir_forGraph = 100.0;
        if ( ir_forGraph < 80.0) ir_forGraph = 80.0;
        if ( red_forGraph > 100.0 ) red_forGraph = 100.0;
        if ( red_forGraph < 80.0 ) red_forGraph = 80.0;
        //        Serial.print(red); Serial.print(","); Serial.print(ir);Serial.print(".");
        if (ir < FINGER_ON) ESpO2 = MINIMUM_SPO2; //indicator for finger detached
        Serial.print((2.0 * fir - aveir) / aveir * SCALE); // to display pulse wave at the same time with SpO2 data
        Serial.print(","); Serial.print((2.0 * fred - avered) / avered * SCALE); // to display pulse wave at the same time with SpO2 data
        Serial.print(","); Serial.print(ESpO2); //low pass filtered SpO2
        Serial.print(","); Serial.print(85.0); //
        Serial.print(","); Serial.print(90.0); //warning SpO2 line
        Serial.print(","); Serial.print(95.0); //safe SpO2 line
        Serial.print(","); Serial.println(100.0); //max SpO2 line
        //#endif
      }
    }
    if ((i % Num) == 0) {
      double R = (sqrt(sumredrms) / avered) / (sqrt(sumirrms) / aveir);
      // Serial.println(R);
      SpO2 = -23.3 * (R - 0.4) + 100; //http://ww1.microchip.com/downloads/jp/AppNotes/00001525B_JP.pdf
      ESpO2 = FSpO2 * ESpO2 + (1.0 - FSpO2) * SpO2;
      //  Serial.print(SpO2);Serial.print(",");Serial.println(ESpO2);
      sumredrms = 0.0; sumirrms = 0.0; i = 0;
      break;
    }
    particleSensor.nextSample(); //We're finished with this sample so move to next sample
    //Serial.println(SpO2);
  }
#endif
}

As usually, I kept the above code in my GitHub account as a repository. In the next guide, we will send the data to IBM Watson IoT platform.

Tagged With esp32 max30102 , пульсоксиметр max30102 ардуино своими руками , max30105 mh-et live , Max30102 spo2 infrared and red led , max30102 remoteme , max30102 please check wiring/power , max30102 arduino codes , max30102 , https://thecustomizewindows com/2020/09/esp32-max30102-pulse-oximeter-code/ , earclip pulse oximeter code

This Article Has Been Shared 817 Times!

Facebook Twitter Pinterest

Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

Here’s what we’ve got for you which might like :

Articles Related to ESP32 MAX30102 Pulse Oximeter Code

  • ESP32 Arduino : IBM Watson Visual Recognition of Images with cURL

    IBM Watson Visual Recognition of Images Supports cURL. ESP32 Arduino Can Send cURL of Images and Receive JSON Response on Serial Monitor.

  • ESP32 Arduino Pulse Sensor Amped

    Some Adjustments in Code Required to Make ESP32 Arduino Pulse Sensor Amped Working. Here is basic how the sensor works and working code.

  • Scope of ESP32 in Commercial IoT Products

    Can ESP32 Used in Commercial IoT Products? Yes, ESP32 has modules and SoC to fit your production need. However, Arduino IDE is not for production.

  • Cheap ESP32-CAM Setup With Arduino IDE

    Here is Minor Details of Cheap ESP32-CAM Setup With Arduino IDE. This Combined Module is Excellent to Build Security Camera for IoT.

  • DIY Solder Masking for PCB Making at Home

    Solder Mask Protects the Copper Tracing of the PCBs & Gives a Professional Look. Here is About the Solder Masking for DIY PCB Making at Home.

Additionally, performing a search on this website can help you. Also, we have YouTube Videos.

Take The Conversation Further ...

We'd love to know your thoughts on this article.
Meet the Author over on Twitter to join the conversation right now!

If you want to Advertise on our Article or want a Sponsored Article, you are invited to Contact us.

Contact Us

Subscribe To Our Free Newsletter

Get new posts by email:

Please Confirm the Subscription When Approval Email Will Arrive in Your Email Inbox as Second Step.

Search this website…

 

Popular Articles

Our Homepage is best place to find popular articles!

Here Are Some Good to Read Articles :

  • Cloud Computing Service Models
  • What is Cloud Computing?
  • Cloud Computing and Social Networks in Mobile Space
  • ARM Processor Architecture
  • What Camera Mode to Choose
  • Indispensable MySQL queries for custom fields in WordPress
  • Windows 7 Speech Recognition Scripting Related Tutorials

Social Networks

  • Pinterest (24.3K Followers)
  • Twitter (5.8k Followers)
  • Facebook (5.7k Followers)
  • LinkedIn (3.7k Followers)
  • YouTube (1.3k Followers)
  • GitHub (Repository)
  • GitHub (Gists)
Looking to publish sponsored article on our website?

Contact us

Recent Posts

  • Exploring the Benefits and Advantages of Microsoft’s Operating System March 22, 2023
  • Web Design Cookbook: Accessibility March 21, 2023
  • Online Dating: How to Find Your Match March 20, 2023
  • Web Design Cookbook: Logo March 19, 2023
  • How Starlink Internet Works March 17, 2023

About This Article

Cite this article as: Abhishek Ghosh, "ESP32 MAX30102 Pulse Oximeter Code," in The Customize Windows, September 23, 2020, March 23, 2023, https://thecustomizewindows.com/2020/09/esp32-max30102-pulse-oximeter-code/.

Source:The Customize Windows, JiMA.in

PC users can consult Corrine Chorney for Security.

Want to know more about us? Read Notability and Mentions & Our Setup.

Copyright © 2023 - The Customize Windows | dESIGNed by The Customize Windows

Copyright  · Privacy Policy  · Advertising Policy  · Terms of Service  · Refund Policy

We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept”, you consent to the use of ALL the cookies.
Do not sell my personal information.
Cookie SettingsAccept
Manage consent

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary
Always Enabled
Necessary cookies are absolutely essential for the website to function properly. These cookies ensure basic functionalities and security features of the website, anonymously.
CookieDurationDescription
cookielawinfo-checkbox-analytics11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
cookielawinfo-checkbox-functional11 monthsThe cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checkbox-necessary11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-others11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
cookielawinfo-checkbox-performance11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
viewed_cookie_policy11 monthsThe cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.
Functional
Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features.
Performance
Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors.
Analytics
Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc.
Advertisement
Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. These cookies track visitors across websites and collect information to provide customized ads.
Others
Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet.
SAVE & ACCEPT