The MAX30100 combines red and infrared emitters with a photodetector for experiments with pulse and oxygen-saturation algorithms. The part is obsolete; for a new design, evaluate MAX30101 or MAX30102 and current library support.
Power and breakout differences
The IC itself uses low-voltage rails, while breakout boards differ in regulator and level-shifter design. Check the actual module schematic before applying 5 V or connecting a different controller.
Signal quality
Motion, contact pressure, ambient light, placement, and circulation affect the signal. Useful results require suitable sampling, filtering, an algorithm, and validation against a reference when accuracy matters.
Use limits
This is an educational signal-processing experiment, not a medical device or diagnostic instrument. Do not use its output for health decisions.
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