MAX30102 with Arduino Mega 2560 R3

Wiring for the MAX30102 heart rate + SpO2 on the Arduino Mega 2560 R3 (ATmega2560, 5 V logic), chosen with the same pin rules BoardPilot uses: default buses first, and no pins that are used for flash, USB, the debugger or booting.

Wiring

MAX30102 pin	Role	Arduino Mega 2560 R3 pin	Notes
VIN	Power	5V
SDA	I2C data (SDA)	SDA 20 (PD1)
SCL	I2C clock (SCL)	SCL 21 (PD0)
INT	Interrupt	~2 (PE4)
IRD	Not wired to the board	not connected	IR LED output. Leave unconnected
RD	Not wired to the board	not connected	Red LED output. Leave unconnected
GND	Ground	GND

Check before you power it on

Supply: 5 V from the 5V pin.
I2C uses the board’s default pins SDA 20 (SDA) and SCL 21 (SCL). Most modules include pull-up resistors; if the part is not found, check them and swap-test SDA/SCL.
To make sure it is the real chip, read register 0xFF: a genuine part answers 0x15.

Test code (Arduino)

#include <Wire.h>

void setup() {
  Serial.begin(115200);
  Wire.begin();  // SDA = SDA 20, SCL = SCL 21 (the board's default I2C pins)
  Wire.beginTransmission(0x57);
  bool found = Wire.endTransmission() == 0;
  Serial.println(found ? "MAX30102 heart rate + SpO2 found at 0x57" : "Not found: check power, GND and SDA/SCL");
}

void loop() {}

Arduino board: arduino:avr:mega.

Questions

Which Arduino Mega 2560 R3 pins do I use for the MAX30102?

VIN → 5V, SDA → SDA 20 (PD1), SCL → SCL 21 (PD0), INT → ~2 (PE4), GND → GND.

Does the MAX30102 work with the Arduino Mega 2560 R3 at 5 V?

Yes: the MAX30102 runs at 3.3-5 V and the Arduino Mega 2560 R3 uses 5 V signals, so no level shifting is needed.

What is the I2C address of the MAX30102?

0x57. An I2C scan (BoardPilot does it for you) shows which one your module uses.

BoardPilot checks this wiring in 3D as you build it, and finds crossed or missing wires on the real board.

Download BoardPilot

Full Arduino Mega 2560 R3 pinout · MAX30102 heart rate + SpO2: all pins and data

The MAX30102 on other boards

ESP32 DevKit Arduino Nano Arduino Uno R3 WeAct Black Pill STM32F411CE ESP32-C3-DevKitM-1 ESP32-S3-DevKitC-1 Nordic nRF52840 DK NUCLEO-F401RE Raspberry Pi Pico 2 Raspberry Pi Pico W Raspberry Pi Pico Teensy 4.1

Other parts on the Arduino Mega 2560 R3

BME280 BMP280 DHT22 DHT11 HC-SR04 SSD1306 OLED MPU6050 DS18B20 WS2812B LED strip SG90 servo Relay module HC-SR501 PIR LCD 1602 I2C INA219 VL53L0X BH1750 RC522 RFID NEO-6M GPS Capacitive soil moisture sensor ADS1115 TM1637 28BYJ-48 stepper L298N Potentiometer Push button LED Joystick module SD card module AHT20