The MAX30102 is a pulse oximeter and heart-rate sensor module designed for non-invasive health monitoring applications. It utilizes photoplethysmography (PPG) technology to measure blood oxygen saturation (SpO2) and heart rate. The module integrates red and infrared LEDs, a photodetector, optical elements, and low-noise electronics in a compact package, making it ideal for wearable devices, fitness trackers, and medical monitoring systems.
This circuit is a multi-sensor data acquisition system that uses a Nucleo WB55RG microcontroller to interface with a digital temperature sensor (TMP102), a pulse oximeter and heart-rate sensor (MAX30102), and a 0.96" OLED display via I2C. Additionally, it includes a Sim800l module for GSM communication, powered by a 3.7V LiPo battery.
Open Project in Cirkit Designer
This circuit features an ESP32-WROOM-32UE microcontroller as the central processing unit, interfacing with a variety of sensors and modules. It includes a MAX30100 pulse oximeter and heart-rate sensor, an MLX90614 infrared thermometer, an HC-05 Bluetooth module for wireless communication, and a Neo 6M GPS module for location tracking. All components are powered by a common voltage supply and are connected to specific GPIO pins on the ESP32 for data exchange, with the sensors using I2C communication and the modules using UART.
Open Project in Cirkit Designer
This circuit features an ESP32 microcontroller connected to a MAX30100 sensor, which is likely used for measuring pulse oximetry. The ESP32 is interfaced with the MAX30100 via I2C communication, as indicated by the SDA and SCL connections. Power is supplied to both the ESP32 and the MAX30100 by a 5V battery, with common ground established across the components.
Open Project in Cirkit Designer
This circuit integrates an ESP32 microcontroller with various sensors and modules, including a MAX30100 pulse oximeter, an MLX90614 infrared thermometer, a Neo 6M GPS module, and an HC-05 Bluetooth module. The ESP32 collects data from these sensors and modules via I2C and UART interfaces, enabling wireless communication and GPS tracking capabilities.
Open Project in Cirkit Designer| Parameter | Value |
|---|---|
| Supply Voltage | 1.8V (core) and 3.3V (LED driver) |
| Operating Current | 600 µA (typical) |
| Standby Current | 0.7 µA |
| Measurement Method | Photoplethysmography (PPG) |
| LED Wavelengths | Red: 660 nm, Infrared: 880 nm |
| Communication Interface | I2C |
| Operating Temperature Range | -40°C to +85°C |
| Dimensions | 5.6 mm x 3.3 mm x 1.55 mm |
The MAX30102 module typically comes with the following pinout:
| Pin Name | Pin Number | Description |
|---|---|---|
| VIN | 1 | Power supply input (3.3V recommended) |
| GND | 2 | Ground |
| SDA | 3 | I2C data line |
| SCL | 4 | I2C clock line |
| INT | 5 | Interrupt output (active low) |
Below is an example of how to interface the MAX30102 with an Arduino UNO using the Adafruit MAX30102 library:
#include <Wire.h>
#include "Adafruit_MAX30102.h"
// Create an instance of the MAX30102 sensor
Adafruit_MAX30102 max30102;
void setup() {
Serial.begin(9600); // Initialize serial communication
while (!Serial); // Wait for the serial monitor to open
// Initialize the I2C communication
if (!max30102.begin()) {
Serial.println("MAX30102 not detected. Check connections.");
while (1); // Halt execution if the sensor is not found
}
Serial.println("MAX30102 initialized successfully.");
}
void loop() {
// Variables to store sensor readings
int redValue, irValue;
// Read data from the sensor
if (max30102.check() == true) {
redValue = max30102.getRed(); // Get red LED value
irValue = max30102.getIR(); // Get infrared LED value
// Print the readings to the serial monitor
Serial.print("Red: ");
Serial.print(redValue);
Serial.print(" | IR: ");
Serial.println(irValue);
} else {
Serial.println("No data available.");
}
delay(100); // Delay for stability
}
Sensor Not Detected:
Inaccurate Readings:
No Data Available:
Q: Can the MAX30102 be powered with 5V?
A: No, the MAX30102 requires a 3.3V power supply. Using 5V can damage the module.
Q: What is the maximum I2C clock speed supported?
A: The MAX30102 supports I2C clock speeds up to 400 kHz.
Q: Can the MAX30102 measure SpO2 and heart rate simultaneously?
A: Yes, the MAX30102 can measure both parameters simultaneously using its red and infrared LEDs.
Q: How do I improve measurement accuracy?
A: Ensure proper sensor placement, minimize ambient light interference, and use a stable power supply.
This concludes the documentation for the MAX30102. For further assistance, refer to the official datasheet or community forums.