Hi, in this tutorial we gonna interface MAX30102: pulse oximetry and heart rate monitor module with Arduino UNO board, and then make a project for measuring BPM using this module + OLED display if needed (a Buzzer).

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%.

The MAX30102 can be found in different modules, I have a WAVGAT version, it's not a problem as long as the IC is MAX30102.

The codes I used in the tutorial are pretty clear and they are just examples from the Sparkfun_MAX3010x library.

For the code I made for the OLED and Buzzer, it's a modified version of the "HeartRate" example, it asks you to put your finger on the sensor.

How does it work?

There is a pulse rate sensor module in our project which plays an important role in calculating the heartbeat rate. Hold the sensor between your fingers or you can also put your finger on it so that the sensor can take the readings. After it, the Arduino does all the processing and calculation and sends the final output signals to the OLED display. The OLED display is much better than other displays because it has more pixels than other ordinary display modules. Finally, you can see the BPM values on the display with a graphical representation of the values. The values keep updating continuously till you remove your finger from the sensor.

This sensor does nothing but measure heart rate of the heart, it can be found in any medical equipment that is used in measuring heart rate. It can be worn on the finger or on the earlobe.

Suitable for all projects that require heart rate data.

In fact today's purpose is this, measure heart rate with the XD-58C sensor.

Once you put your finger, remain calm for a while, until you start hearing the Buzzer's "Beeps" synchronized with your heart beats or the OLED animation is synchronized with it, and then you can read a correct BPM.

N.B: In the code I actually print the Average BPM, since it do the average of 4 BPMs it's more accurate just give it some time.

After a while you'll have a good BPM reading and a synchronized animation/"Beeps"

Make Bitmaps for the OLED

The heart (small) you see is a bitmap picture, and everytime the sensor detects a heart beat we switch to another heart (big) bitmap picture for a while and it gives the impression of a heart beats alongside with a beep from the buzzer.

Here are the two bitmaps in the code that we call later on the code

I called them logo2_bmp and logo3_bmp I don't know why

To make these, Look for a picture (black with white background) for wathever you want to see in the screen just don't forget about the size, the one I'm using is 128x32 px and the pictures are smaller than that (32x32 px) and (24x21 px)

Make sure the little pictures have Monochrome Bitmap format

Download LCD Assistant and open it (few steps below)

Open the Assistant Try these operations in both Vertical and Horizontal until it's right

Look for you image

Note the Width and Height of the image

Give the file a name and path then save it

Open the file with note pad or anything similar

And here are your "numbers"

Copy this and put it in your code, add PROGMEM to put it in the Arduino Flash and save some space

And here's how I called it in the code

display.drawBitmap(5, 5, logo2_bmp, 24, 21, WHITE);

Which means

display.drawBitmap(Starting x pos, Starting y pos, Bitmap name, Width, Height, Color);

And as you can see in the code one is called when a finger is detected and the other one if a heart beat is detected.

And here you go make what you want.