MAXREFDES117# reference design board

The MAX30102 is a low power, optical heart-rate module complete with integrated red and IR LEDs, and a power supply. The MAX30102 is available on a reference design board. This tiny board, perfect for wearable projects, may be placed on a finger or earlobe to accurately detect heart rate.

Wiring

The MAX30102 communicates via the I2C interface available on the mbed.

Library files and example code

Maxim Integrated provides some example code for accessing and calculating the heart-rate and blood oxidation data, however it requires modifications to work on general mbed hardware.

A modified program with updated library files is available:

The code connects to the serial port of a PC to display the data form the sensor.

Output

Once the code is running the sensor will go through a calibration cycle and then start outputting data that will be displayed on the serial port.

Six values are output:

HRvalid and SpO2valid tell us if the Maxim algothim think that the values it's generating for HR and SpO2 correct.

Output showing valid heartrate data, but still invalid blood-ox.