Add real health sensing to your wearable builds with the MAX30102 — an integrated pulse oximeter and heart rate biosensor used in Samsung Galaxy phones and professional fitness devices. It measures heart rate and blood oxygen saturation (SpO2) using red (660nm) and infrared (880nm) LEDs with PPG (photoplethysmography) reflection, and communicates over I2C.
Works on fingers, earlobes, and wrists. An integrated glass cover and ambient light suppression circuit ensure reliable readings even in bright environments. Ultra-low standby power (near zero) makes it ideal for battery-powered wearables.
Specs
Sensor IC: MAX30102
Measurement: Heart rate + SpO2 (blood oxygen)
LED wavelengths: 660nm (red) / 880nm (IR)
Signal type: PPG (light reflection)
Interface: I2C
Supply voltage: 1.8V – 5V
Communication voltage: 1.8V / 3.3V / 5V (selectable via pad)
Mounting holes: 0.5 × 8.5mm
Pin Definitions
VIN — Power input (1.8V–5V)
GND — Ground
SCL — I2C Clock
SDA — I2C Data
INT — Interrupt output
RD / IRD — LED ground terminals (typically not connected)
3-bit pad — Bus pull-up level select (1.8V or 3.3V+)
