The MAX30102 is a pulse oximeter and heart-rate sensor designed for non-invasive health monitoring applications. It utilizes photoplethysmography (PPG) technology to measure blood oxygen saturation (SpO2) and heart rate. The sensor 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 DesignerThe MAX30102 is a highly integrated sensor with the following key specifications:
| Parameter | Value |
|---|---|
| Operating Voltage | 1.8V (core) and 3.3V (LEDs) |
| Current Consumption | 600 µA (typical, during active operation) |
| 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 |
| Package Dimensions | 5.6 mm x 3.3 mm x 1.55 mm |
The MAX30102 has 8 pins, as described in the table below:
| Pin Name | Pin Number | Description |
|---|---|---|
| VIN | 1 | Power supply input (1.8V or 3.3V) |
| GND | 2 | Ground |
| SDA | 3 | I2C data line |
| SCL | 4 | I2C clock line |
| INT | 5 | Interrupt output (active low) |
| RD1 | 6 | Red LED cathode (internally connected) |
| IRD1 | 7 | Infrared LED cathode (internally connected) |
| NC | 8 | No connection |
Below is an example of how to interface the MAX30102 with an Arduino UNO to read heart rate and SpO2 data:
#include <Wire.h>
#include "MAX30105.h" // Include the MAX30102 library
MAX30105 particleSensor; // Create an instance of the sensor
void setup() {
Serial.begin(9600); // Initialize serial communication
Serial.println("Initializing MAX30102...");
// Initialize the sensor
if (!particleSensor.begin()) {
Serial.println("MAX30102 not detected. Check connections.");
while (1); // Halt execution if the sensor is not found
}
// Configure the sensor
particleSensor.setup(); // Default settings
particleSensor.setPulseAmplitudeRed(0x0A); // Set red LED brightness
particleSensor.setPulseAmplitudeIR(0x0A); // Set IR LED brightness
}
void loop() {
// Read data from the sensor
long redValue = particleSensor.getRed(); // Red LED value
long irValue = particleSensor.getIR(); // IR LED value
// Print the values to the serial monitor
Serial.print("Red: ");
Serial.print(redValue);
Serial.print(" IR: ");
Serial.println(irValue);
delay(100); // Delay for stability
}
Sensor Not Detected:
Inaccurate Readings:
No Data Output:
By following this documentation, you should be able to successfully integrate and use the MAX30102 in your projects.