Real-Time Heart Rate Monitor

This repository contains three Arduino sketches for building a real-time heart rate monitor using the MAX30102 IR sensor and a 128×64 OLED display. The system performs beat detection, BPM estimation, and waveform visualization without requiring a serial interface. Designed for both breadboard prototyping and custom PCB deployment using the Atmega328P microcontroller.

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Requirements

• Arduino IDE
• Libraries:
  • SparkFun MAX3010x
  • Adafruit SSD1306
  • Adafruit GFX

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Hardware Setup

Common Components

• MAX30102 IR heart rate sensor (I2C)
• SSD1306 128x64 OLED display (I2C)
• Atmega328P (Arduino-compatible)
• 16 MHz crystal + 22pF capacitors
• LED for heartbeat alert
• 10kΩ pull-up resistors (SDA/SCL, if needed)
• Power supply (e.g., 6V via coin cell or USB)

Variants

• heart-tracker-arduino: For Arduino Uno/Nano boards
• heart-tracker-breadboard: Minimal Atmega328P setup on breadboard
• heart-tracker-pcb: Final version for custom PCB

Schematic & PCB

• The schematic/ folder contains:
  • Circuit schematic diagram
  • 3D rendering of the board

All hardware was designed using EasyEDA.

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Programming

1. Choose the appropriate .ino file:
   • Use Arduino IDE
   • Select the correct board and programmer
2. For bare-metal Atmega328P (breadboard/PCB), use an ISP (e.g., Arduino as ISP)
3. Upload the sketch
4. The OLED will show:
   • Real-time IR signal waveform
   • Calculated BPM
   • Live IR readings
5. The LED flashes on each heartbeat (when IR signal is strong)

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License

MIT © 2025