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This simple and inexpensive project is based around the MAX30100 sensor breakout board and utilizes a small 0.91" OLED display to report the heart rate and oxygenation level.

Both the devices used have an I2C two-wire interface and therefore keeps the wiring down to a minimum.

Parts used

Step 1: The Wiring

Both the OLED display and the MAX30100 breakout board need need 4 wires connected to the Arduino board:

  • Ground
  • VCC
  • SDA
  • SCL

The data lines for the I2C interface will depend on the specific version of the Arduino board being used. In this case I am using A4 for SDA and A5 for SCL, as these are the hardware dedicated pins for the Uno and Nano.

<p>Nice work! </p>
<p>I had to update the &quot;u8g2&quot; library for the font to make it compile and upload in version 1.6.8. Thanks for sharing. Just what I wanted.</p>
<p>The OLED Screen is a really nice touch. </p>
<p>Thanks, It worked out nicely. </p>

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