In this project we will build a device that can measure Blood Oxygen Concentration & Heart Rate using MAX30100 Pulse Oximeter & NodeMCU. The blood Oxygen Concentration termed as SpO2 is measured in Percentage and Heart Beat/Pulse Rate is measured in BPM. The MAX30100 is a Pulse Oximetry and heart rate monitor sensor solution.We will display the SpO2 and BPM value in 0.96″ OLED Display. With each beat, the display value is changed in the OLED screen.
BPM are the “beats per minute” and they are around 65-75 while resting for a normal person,
athletics may have lower than that, and the SpO2 is the Oxygen saturation level, and for a normal person it’s above 95%.
Components Requried.
Schematics.
Connect the NodeMCU , OLED display & MAX30100 module as shown in the schematic below.
Prototype PCB.
I want to turn my breadboard circuits into real boards and make my project look more professional, so I decided to Design my own coustom PCB for this project.
Designing the PCB
To design the circuit and PCB, we used EasyEDA which is a browser based software to design PCBs.
Designing the circuit works like in any other circuit software tool, you place some components and you wire them together. Then, you assign each component to a footprint.
Having the parts assigned, place each component. When you’re happy with the layout, make all the connections and route your PCB.
Save your project and export the Gerber files.
Ordering the PCBs at PCBWay.
This project is sponsored by PCBWay. PCBWay is a full feature Printed Circuit Board manufacturing service.
Turn your DIY breadboard circuits into professional PCBs – get 10 boards for approximately $5 + shipping (which will vary depending on your country).
Once you have your Gerber files, you can order the PCB. Follow the next steps.
1. Download the Gerber files – click here to download the .zip file.
2. Go to PCBWay website and open the PCB Instant Quote page.
3. PCBWay can grab all the PCB details and automatically fills them for you. Use the “Quick-order PCB (Autofill parameters)”.
4. Press the “+ Add Gerber file” button to upload the provided Gerber files.
After approximately one week using the DHL shipping method, I received the PCBs at my place.As usual, everything comes well packed, and the PCBs are really high-quality.
The letters on the silkscreen are really well-printed and easy to read. Additionally, the solder sticks easily to the pads.
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Lucky Draw.
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Rules.
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Code.
Copy the following code to your Arduino IDE and upload it to your Arduino board.
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "MAX30100_PulseOximeter.h"
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
#define NUMFLAKES 10 // Number of snowflakes in the animation example
#define LOGO_HEIGHT 16
#define LOGO_WIDTH 16
#define REPORTING_PERIOD_MS 1000
PulseOximeter pox;
uint32_t tsLastReport = 0;
const unsigned char bitmap [] PROGMEM=
{
0x00, 0x00, 0x00, 0x00, 0x01, 0x80, 0x18, 0x00, 0x0f, 0xe0, 0x7f, 0x00, 0x3f, 0xf9, 0xff, 0xc0,
0x7f, 0xf9, 0xff, 0xc0, 0x7f, 0xff, 0xff, 0xe0, 0x7f, 0xff, 0xff, 0xe0, 0xff, 0xff, 0xff, 0xf0,
0xff, 0xf7, 0xff, 0xf0, 0xff, 0xe7, 0xff, 0xf0, 0xff, 0xe7, 0xff, 0xf0, 0x7f, 0xdb, 0xff, 0xe0,
0x7f, 0x9b, 0xff, 0xe0, 0x00, 0x3b, 0xc0, 0x00, 0x3f, 0xf9, 0x9f, 0xc0, 0x3f, 0xfd, 0xbf, 0xc0,
0x1f, 0xfd, 0xbf, 0x80, 0x0f, 0xfd, 0x7f, 0x00, 0x07, 0xfe, 0x7e, 0x00, 0x03, 0xfe, 0xfc, 0x00,
0x01, 0xff, 0xf8, 0x00, 0x00, 0xff, 0xf0, 0x00, 0x00, 0x7f, 0xe0, 0x00, 0x00, 0x3f, 0xc0, 0x00,
0x00, 0x0f, 0x00, 0x00, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
void onBeatDetected()
{
Serial.println("Beat!");
display.drawBitmap( 60, 20, bitmap, 28, 28, 1);
display.display();
}
void setup() {
Serial.begin(9600);
// SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
Serial.println(F("SSD1306 allocation failed"));
for(;;); // Don't proceed, loop forever
}
// Show initial display buffer contents on the screen --
// the library initializes this with an Adafruit splash screen.
display.display();
delay(2000); // Pause for 2 seconds
// Clear the buffer
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(1);
display.setCursor(0, 0);
display.println("Initializing pulse oximeter..");
display.display();
Serial.print("Initializing pulse oximeter..");
if (!pox.begin()) {
Serial.println("FAILED");
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(1);
display.setCursor(0, 0);
display.println("FAILED");
display.display();
for(;;);
} else {
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(1);
display.setCursor(0, 0);
display.println("SUCCESS");
display.display();
Serial.println("SUCCESS");
}
pox.setOnBeatDetectedCallback(onBeatDetected);
}
void loop() {
pox.update();
if (millis() - tsLastReport > REPORTING_PERIOD_MS) {
Serial.print("Heart BPM:");
Serial.print(pox.getHeartRate());
Serial.print("-----");
Serial.print("Oxygen Percent:");
Serial.print(pox.getSpO2());
Serial.println("\n");
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(1);
display.setCursor(0,16);
display.println(pox.getHeartRate());
display.setTextSize(1);
display.setTextColor(1);
display.setCursor(0, 0);
display.println("Heart BPM");
display.setTextSize(1);
display.setTextColor(1);
display.setCursor(0, 30);
display.println("Spo2");
display.setTextSize(1);
display.setTextColor(1);
display.setCursor(0,45);
display.println(pox.getSpO2());
display.display();
tsLastReport = millis();
}
} Video Tutorial.
Thank you for Reading!!
