Published May 18, 2020 © GPL3+

Pulse oximeter with alert function

Making a pulse oximeter with alert function based on M5Stack Basic and LPWA Network.

BeginnerProtip4,164

Things used in this project

Hardware components

M5Stack ESP32 Basic Core IoT Development Kit

M5Stack Mini Heart Rate Unit MAX30100 Module Sensor

Sigfox Breakout board BRKWS01

Available to use other breakout board like UnaMKR mini

Software apps and online services

Arduino IDE

Sigfox backend cloud

Story

Due to the spread of COVID-19, the overwhelming the capacity of the health care system causes increasing persons who have to stay home even if they are suspected as a infection. Many person are concerned about their health, especially elderly people living alone.

This project can help that person by sharing their health condition like heartbeat and blood oxygen level.

Measuring Heartbeat and SpO2

You can wire a Heart Rate Unit directly to M5Stack Basic via I2C.

The heart rate unit for M5Stack includes a MAX30100 chip, so you add "MAX30100lib" library with Adruino IDE Library Manager.

This library simply provide the functions that retrieving your heartbeat (getHeartRate()) and SpO2 (getSpO2()).

Connect a Sigfox Breakout board

Sigfox Breakout board [BRKWS01] only requires 3.3V input and Serial communication. so the following pins are connected to the breakout board.

M5Stack BRKWS01

3V3 -> (+)

Ground -> (-)

RXD2(16) -> TX

TXD2(17) -> RX

Alert Email

Sigfox backend cloud has a callback function that deliver messages to some email addresses. This function allow us to alert the health condition to family.

On the sample code, an alert message is sent when a button on M5Stack is pushed though, you can customize the message trigger, for instance when the vital sign is worse.

Code

#include <M5Stack.h>
#include <Wire.h>
#include "MAX30100_PulseOximeter.h"
#include "xbm.h"  //my bitmap

#define REPORTING_PERIOD_MS     1000

PulseOximeter pox;
uint8_t Heart_rate = 0;
uint8_t Spo2 = 0;
uint32_t tsLastReport = 0;

// Callback (registered below) fired when a pulse is detected
void onBeatDetected()
{
  printHRandSPO2(true);
}

void setup()
{
  Serial.begin(115200); // to PC via USB
  Serial2.begin(9600, SERIAL_8N1, 16, 17);   // to Sigfox module

  M5.begin();
  M5.Power.begin();
  M5.Lcd.clear(BLACK);
  M5.Lcd.setTextSize(4);
  
  // Initialize sensor
  if (!pox.begin()) {
    M5.Lcd.println("FAILED");
    for(;;);
   } else {
    M5.Lcd.println("SUCCESS");
  }

  //LED Configuration
  pox.setIRLedCurrent(MAX30100_LED_CURR_7_6MA);
  //Register a callback for the beat detection
  pox.setOnBeatDetectedCallback(onBeatDetected);
}

void loop()
{
  M5.update();  //update button state
  pox.update(); //update pulse oximeter

  if (millis() - tsLastReport > REPORTING_PERIOD_MS) {
    Heart_rate = (int)pox.getHeartRate();
    Spo2 = pox.getSpO2();
    printHRandSPO2(false);
    tsLastReport = millis();
  }

  if (M5.BtnA.wasReleased()) {
    sendSigfoxMessage();
  }
}

void printHRandSPO2(bool beat)
{
  M5.Lcd.fillScreen(BLACK);
  M5.Lcd.setTextColor(WHITE);
  M5.Lcd.setTextSize(4);
  if (beat) {
    M5.Lcd.drawXBitmap(0, 5, hb2_bmp, 64, 32, TFT_RED);
  } else {
    M5.Lcd.drawXBitmap(0, 5, hb1_bmp, 64, 32, TFT_WHITE);
  }
  M5.Lcd.setCursor(0,70);
  M5.Lcd.print("HR:   "); M5.Lcd.println(Heart_rate);
  M5.Lcd.print("SPO2: "); M5.Lcd.println(Spo2);  
}

void sendSigfoxMessage() 
{
  String msg = "AT$SF=" + String(Heart_rate, HEX) + String(Spo2, HEX);
  Serial2.println(msg);
  M5.Lcd.setCursor(0,160);
  M5.Lcd.println("MSG Sent!");
  delay(10000);
}

#include <pgmspace.h>  // PROGMEM support header

#define imgWidth  64  // logo width
#define imgHeight 32  // logo height

static const uint8_t hb1_bmp[] = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x70, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x70, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xD8, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0xDC, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x00, 
  0xDC, 0x00, 0x00, 0x00, 0x00, 0x38, 0x00, 0x00, 0xCC, 0x01, 0x00, 0x00, 
  0x00, 0x3C, 0x00, 0x00, 0xCC, 0x00, 0x00, 0x00, 0x00, 0x7C, 0x00, 0x00, 
  0x8C, 0x01, 0x00, 0x00, 0x00, 0x6E, 0x00, 0x00, 0x8C, 0x01, 0x00, 0x00, 
  0x00, 0xE6, 0x00, 0x00, 0x8E, 0x01, 0x00, 0x00, 0xF8, 0xC7, 0x0F, 0xFF, 
  0x87, 0xFF, 0xC0, 0x0F, 0xF0, 0x83, 0x1F, 0xFF, 0x07, 0xFF, 0xC1, 0x0F, 
  0x00, 0x00, 0x18, 0x03, 0x00, 0x80, 0xC1, 0x00, 0x00, 0x00, 0x9C, 0x01, 
  0x00, 0x80, 0x61, 0x00, 0x00, 0x00, 0x98, 0x01, 0x00, 0x80, 0x63, 0x00, 
  0x00, 0x00, 0xB0, 0x01, 0x00, 0x00, 0x73, 0x00, 0x00, 0x00, 0xF8, 0x01, 
  0x00, 0x00, 0x33, 0x00, 0x00, 0x00, 0xF0, 0x00, 0x00, 0x00, 0x3F, 0x00, 
  0x00, 0x00, 0xF0, 0x00, 0x00, 0x00, 0x1E, 0x00, 0x00, 0x00, 0xF0, 0x00, 
  0x00, 0x00, 0x1E, 0x00, 0x00, 0x00, 0x60, 0x00, 0x00, 0x00, 0x0E, 0x00, 
  0x00, 0x00, 0x60, 0x00, 0x00, 0x00, 0x0C, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, };

static const uint8_t hb2_bmp[] = {
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF8, 0x87, 0x0F, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0xFE, 0x8F, 0x1F, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 
  0x3F, 0x7F, 0x00, 0x00, 0x00, 0x00, 0x80, 0xFF, 0x3F, 0x7F, 0x00, 0x00, 
  0x00, 0x00, 0xC0, 0xFF, 0x7F, 0xFF, 0x00, 0x00, 0x00, 0x00, 0xC0, 0xFF, 
  0xE3, 0xFF, 0x01, 0x00, 0x00, 0x00, 0xE0, 0xFF, 0xC3, 0xFF, 0x01, 0x00, 
  0x00, 0x00, 0xE0, 0xFF, 0x99, 0xFF, 0x01, 0x00, 0x00, 0x00, 0xE0, 0xFF, 
  0x99, 0xFF, 0x03, 0x00, 0x00, 0x00, 0xE0, 0xFF, 0x3C, 0xFF, 0x03, 0x00, 
  0x00, 0x18, 0xE0, 0xFF, 0x3C, 0xFF, 0x03, 0x00, 0x00, 0x1C, 0xF0, 0xFF, 
  0x3C, 0xFF, 0x03, 0x00, 0x00, 0x3C, 0xE0, 0x7F, 0x6E, 0xFE, 0x03, 0x00, 
  0x00, 0x3E, 0xE0, 0x7F, 0x66, 0xFE, 0x01, 0x00, 0x00, 0x66, 0x60, 0x00, 
  0xE6, 0x00, 0x01, 0x00, 0x20, 0x67, 0x04, 0x11, 0xC7, 0x20, 0x01, 0x01, 
  0xF8, 0xE3, 0x07, 0xFF, 0xC3, 0x7F, 0xE0, 0x03, 0xF0, 0xC1, 0x8F, 0xFF, 
  0x83, 0x7F, 0xF0, 0x03, 0x00, 0x00, 0x8C, 0x01, 0x18, 0xE0, 0x30, 0x00, 
  0x00, 0x00, 0xDC, 0x11, 0xBC, 0xC2, 0x38, 0x00, 0x00, 0x00, 0xD8, 0xFC, 
  0xFF, 0xCF, 0x18, 0x00, 0x00, 0x00, 0xD8, 0xFC, 0xFF, 0xCF, 0x19, 0x00, 
  0x00, 0x00, 0xF8, 0xF8, 0xFF, 0x8F, 0x0D, 0x00, 0x00, 0x00, 0x78, 0xF0, 
  0xFF, 0x87, 0x0F, 0x00, 0x00, 0x00, 0x70, 0xE0, 0xFF, 0x83, 0x07, 0x00, 
  0x00, 0x00, 0x70, 0xC0, 0xFF, 0x01, 0x07, 0x00, 0x00, 0x00, 0x30, 0x00, 
  0x7F, 0x00, 0x03, 0x00, 0x00, 0x00, 0x20, 0x00, 0x3C, 0x00, 0x02, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, };

Credits

Gaku Hibi

0 projects • 2 followers

Pulse oximeter with alert function

Things used in this project

Hardware components

Software apps and online services

Story

Measuring Heartbeat and SpO2

Connect a Sigfox Breakout board

Alert Email

Schematics

Pin assignment of breakout board

Code

M5Stack-Pulse-oximeter

xbm.h

Credits

Gaku Hibi

Comments

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Pulse oximeter with alert function

Pulse oximeter with alert function

Things used in this project

Hardware components

Software apps and online services

Story

Measuring Heartbeat and SpO2

Connect a Sigfox Breakout board

Alert Email

Schematics

Pin assignment of breakout board

Code

M5Stack-Pulse-oximeter

xbm.h

Credits

Gaku Hibi

Comments

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