The MAX30100 is an integrated pulse oximetry and heart-rate monitor sensor solution. It combines two LEDs, a photodetector, optimized optics, and low-noise analog signal processing to detect pulse oximetry and heart-rate signals. The MAX30100 is widely used in wearable technology, fitness assistant devices, and medical monitoring equipment.
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 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 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
This circuit integrates a MAX30100 pulse oximeter and heart-rate sensor, and an MLX90614 infrared temperature sensor with an ESP8266 NodeMCU microcontroller. The sensors communicate with the microcontroller via I2C protocol, and the NodeMCU provides power and handles data processing and transmission.
Open Project in Cirkit Designer| Pin Number | Name | Description |
|---|---|---|
| 1 | VIN | Supply voltage (1.8V to 3.3V) |
| 2 | SCL | I2C clock |
| 3 | SDA | I2C data |
| 4 | INT | Interrupt output |
| 5 | RD | Red LED cathode |
| 6 | IRD | IR LED cathode |
| 7 | GND | Ground |
#include <Wire.h>
#include "MAX30100_PulseOximeter.h"
PulseOximeter pox;
uint32_t tsLastReport = 0;
void setup() {
Serial.begin(115200);
if (!pox.begin()) {
Serial.println("Failed to initialize pulse oximeter!");
for(;;);
} else {
Serial.println("Pulse oximeter initialized.");
}
}
void loop() {
// Make sure to call update as fast as possible
pox.update();
if (millis() - tsLastReport > 1000) {
Serial.print("Heart rate:");
Serial.print(pox.getHeartRate());
Serial.print("bpm / SpO2:");
Serial.print(pox.getSpO2());
Serial.println("%");
tsLastReport = millis();
}
}
Note: This example assumes the use of a MAX30100 library, which provides the PulseOximeter class and simplifies the interaction with the sensor.
Q: Can the MAX30100 be used with a 5V system? A: While the MAX30100 operates at 1.8V to 3.3V, level shifters can be used for 5V systems.
Q: How can I improve the accuracy of the sensor? A: Ensure a snug fit against the skin, minimize motion, and avoid external light interference.
Q: What is the default I2C address of the MAX30100? A: The default I2C address is 0x57 (7-bit).
Q: How do I know if the MAX30100 is functioning correctly? A: Check for a stable heart rate and SpO2 reading. If the readings are erratic, review the sensor placement and circuit connections.