The MAX30102 is a pulse oximeter and heart-rate sensor module designed for non-invasive monitoring of vital signs. It utilizes photoplethysmography (PPG) technology to measure blood oxygen saturation (SpO2) and heart rate. The module integrates two LEDs (red and infrared) and a photodetector, along with optical elements and low-noise electronics, to provide accurate and reliable measurements.
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 DesignerThe MAX30102 is a highly integrated module with the following key specifications:
| Parameter | Value |
|---|---|
| Operating Voltage | 1.8V (core) and 3.3V (I/O) |
| Supply Voltage Range | 1.7V to 2.0V (core), 3.0V to 3.6V (I/O) |
| Operating Current | 600 µA (typical) |
| Standby Current | 0.7 µA |
| LED Wavelengths | Red: 660 nm, Infrared: 880 nm |
| Communication Interface | I2C (7-bit address: 0x57) |
| Sampling Rate | Programmable (up to 1000 samples per second) |
| 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) |
| GND | 2 | Ground |
| SDA | 3 | I2C data line |
| SCL | 4 | I2C clock line |
| INT | 5 | Interrupt output (active low) |
Below is an example code snippet 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 MAX30102 sensor
if (!max30102.begin()) {
Serial.println("MAX30102 initialization failed!");
while (1); // Halt execution if initialization fails
}
Serial.println("MAX30102 initialized successfully!");
}
void loop() {
// Variables to store sensor readings
int redValue, irValue;
// Read red and infrared LED values
if (max30102.check() == true) {
redValue = max30102.getRed();
irValue = max30102.getIR();
// 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 from MAX30102.");
}
delay(100); // Delay for stability
}
Sensor Not Detected on I2C Bus:
Inaccurate Readings:
Initialization Fails:
Q: Can the MAX30102 measure SpO2 and heart rate simultaneously?
A: Yes, the MAX30102 can measure both SpO2 and heart rate simultaneously using its red and infrared LEDs.
Q: What is the maximum distance between the sensor and the microcontroller?
A: The maximum distance depends on the I2C bus specifications. Typically, it should not exceed 1 meter without additional hardware (e.g., I2C extenders).
Q: Is the MAX30102 suitable for continuous monitoring?
A: Yes, the MAX30102 is designed for continuous monitoring applications, provided it is used within its operating conditions.
Q: Can the MAX30102 be used with a 5V microcontroller?
A: Yes, but a logic level shifter is required to interface the 3.3V I2C lines with the 5V microcontroller.