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MAX30102 Pulse-Ox & Heart-Rate Sensor

ET-S49

MAX30102 Pulse-Ox & Heart-Rate Sensor

SpO₂ and heart-rate optical sensor (not medical)

AED 59.00

Out of stock
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Download datasheet (PDF)

OverviewKey featuresSpecificationsPerformancePinout

Overview

SpO₂ and heart-rate optical sensor (not medical)

The ET-S49 is built around the Maxim MAX30102 — red + IR LEDs, photodetector, 18-bit ADC, FIFO, ambient light cancellation. It connects over I²C 0x57 (open-drain pins tolerate 3.3V pull-ups) and is powered from VIN 3.3–5.5V → 3.3V (LEDs) + 1.8V (VDD) LDOs.

Two Qwiic / STEMMA QT connectors let you chain it with other boards without soldering, and the 2.54 mm header fits a breadboard.

Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.

Good for

  • Heart-rate wearables
  • Biofeedback projects
  • STEM and teaching labs

Key features

What makes it different

Sensor

Maxim MAX30102: red + IR LEDs, photodetector, 18-bit ADC, FIFO, ambient light cancellation

Interface

I2C 0x57 (open-drain pins tolerate 3.3V pull-ups)

Supply

VIN 3.3–5.5V → 3.3V (LEDs) + 1.8V (VDD) LDOs

Libraries

SparkFun MAX3010x (Arduino), Maxim algorithm (SpO2), ESPHome external component

Qwiic / STEMMA QT

Two JST-SH connectors plus a 2.54 mm header — 3.3 V and 5 V hosts.

Open documentation

Schematic, BOM and layout notes published for every board.

Specifications

Technical specifications

Device
SensorMaxim MAX30102: red + IR LEDs, photodetector, 18-bit ADC, FIFO, ambient light cancellation
InterfaceI2C 0x57 (open-drain pins tolerate 3.3V pull-ups)
SupplyVIN 3.3–5.5V → 3.3V (LEDs) + 1.8V (VDD) LDOs
Board
Size25.4 × 17.8 mm
Mounting4 × M2.5 holes, 2.54 mm from each corner
Connectors2 × Qwiic / STEMMA QT (JST SH 4-pin) · 6-pin 2.54 mm header
Main ICMAX30102EFD+T (LCSC C6454833)
RevisionRev B
Software
LibrariesSparkFun MAX3010x (Arduino), Maxim algorithm (SpO2), ESPHome external component
Solder jumpers
JP1 (default Closed)Cut to turn off the LED
JP2 (default Closed)Cut to remove the host-side I2C pull-ups

Performance

Sampling rates

Sample rate settingsAnalog Devices MAX30102 datasheet. 100 SPS is plenty for heart rate and SpO₂; higher rates need shorter LED pulses.

Pinout

Pin map and connections

MAX30102 Pulse-Ox & Heart-Rate Sensor pinout: VIN, 3V3, GND, SCL, SDA, INT
PinNameTypeFunction
1VINPower3.3–5.5V
23V3PowerLDO output
3GNDGroundGround
4SCLI²CI²C clock
5SDAI²CI²C data
6INTOutputData ready, active low, host level

Qwiic / STEMMA QT pins: GND, VIN, SDA, SCL (same on both connectors). I²C pull-ups (10 kΩ) are on the board; cut JP2 to remove them.

Mechanical

Dimensions and what's in the box

Board 25.4 × 17.8 mm with M2.5 holes
Top view · 25.4 × 17.8 mm

In the box

  • 1 × ET-S49 MAX30102 Pulse-Ox & Heart-Rate Sensor (assembled)
  • 1 × 6-pin 2.54 mm male header, unsoldered

Getting started

  • Plug in a Qwiic / STEMMA QT cable, or solder the header and wire VIN, GND, SDA and SCL
  • Libraries: SparkFun MAX3010x (Arduino), Maxim algorithm (SpO2), ESPHome external component
  • Run an I²C scanner to confirm the address: 0x57

Compare

Which health sensor?

MAX30102 Pulse-Ox & Heart-Rate Sensor (this board)This boardET-S50 AD8232 ECG Front End
What it doesSpO₂ and heart-rate optical sensor (not medical)Single-lead ECG and heart-rate front end (not medical)
InterfaceI²C 0x57 (open-drain pins tolerate 3.3V pull-ups)—
Best forHeart-rate wearablesECG learning and STEM labs
Price59 AED79 AED

Downloads

Documents and design files

PDFET-S49 schematicRev BLCSCMAX30102EFD+T datasheet and stockC6454833
STEP3D modelComing soon

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