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MAX30102 Heart Rate Sensor Module
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The MAX30102 is an integrated heart rate and pulse oximetry (SpO2) sensor module. It combines red and infrared LEDs, a photodetector, and low-noise analogue ...
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The MAX30102 is an integrated heart rate and pulse oximetry (SpO2) sensor module. It combines red and infrared LEDs, a photodetector, and low-noise analogue electronics in a single package, communicating over I²C. Ideal for wearable health monitors, fitness trackers, and biomedical prototyping.
The module accepts 3.3–5 V input and draws a maximum of 6 mA. A software-controlled shutdown mode reduces standby current to near zero, making it well-suited for battery-powered applications.
Key Features
- Heart Rate + SpO2 – Measures pulse and blood oxygen saturation via PPG
- Dual-Wavelength LEDs – 660 nm (red) and 880 nm (IR) for accurate readings
- 18-Bit ADC – High-resolution analogue-to-digital conversion
- Adjustable Sampling Rate – 50 Hz to 3200 Hz
- I²C Interface – Standard two-wire connection to any microcontroller
- Low Power – 6 mA max; software shutdown for near-zero standby
- Interrupt Pin – Hardware interrupt for real-time event notification
Specifications
- Sensor: Maxim MAX30102
- Input Voltage: 1.8–5 V DC
- Current Draw: 6 mA max
- ADC Resolution: 18-bit
- LED Wavelengths: 660 nm / 880 nm
- Sampling Rate: 50–3200 Hz
- Operating Temperature: −40 to +85 °C
- Interface: I²C
Pinout
- VIN – Power input (1.8–5 V DC)
- SCL / SDA – I²C clock and data
- INT – Interrupt output
- RD / IRD – Ground for red and IR LEDs
- GND – Common ground
Ideal For
- Wearable fitness and health monitors
- Biomedical and SpO2 prototyping
- Arduino and Raspberry Pi health-sensing projects
Package Contents
- 1× MAX30102 Heart Rate and Pulse Oximeter Sensor Module
Jargon buster
Plain-language definitions for the technical terms used above.
- ADC
- An analogue-to-digital converter reads a changing voltage and turns it into a number the microcontroller can use. It matters when connecting analogue sensors such as light, sound, or variable-resistor sensors.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- GND
- GND is the ground or reference connection (0 V) for a circuit. When connecting two devices together, their grounds must be joined so both agree on what counts as a low or high signal.
- LED
- A light-emitting diode (LED) is a small electronic component that emits light when current flows through it in the correct direction. Because it only conducts one way, its polarity matters, and a through-hole LED must be soldered the correct way around to light up.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- SCL
- The clock line used by the I2C bus to keep data transfers timed between a controller and connected devices. When wiring I2C, SCL must be connected to the SCL pin on every device sharing the bus.
- SDA
- The data line used by the I2C bus to carry information between a controller and connected devices. When wiring I2C, SDA must be connected to the SDA pin on every device sharing the bus.
- Torque
- A twisting force that causes something to rotate, usually measured in newton-metres or kilogram-centimetres. It matters when choosing motors, servos, gears, and tools because higher torque is needed to lift heavier loads, turn larger wheels, or move mechanisms without stalling.
- wavelength
- The distance between repeating peaks of a wave, often used to describe the colour of light in nanometres. For visible lasers and LEDs, wavelength tells you the approximate colour, such as red, green or blue.
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