Pulse Oximeter with Raspberry Pi + MAX30102
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Description
This Raspberry Pi-based pulse oximeter measures real-time heart rate (BPM) and blood oxygen saturation (SpO₂) using the MAX30102 sensor module. Readings are displayed on a 16x2 LCD and the system includes physical buttons to start readings and shut down the Pi safely — no keyboard or monitor required after setup. Designed for biomedical hobbyists and students, this project blends embedded Linux, Python scripting, and biosignal processing into one elegant build.
I wanted to test my ability with a PPG sensor because I was curious on how the sensor worked. Enjoy!!
🎯 Key Features
- 📊 Real-time display of BPM & SpO₂ on an LCD
- 🧠 Uses Doug Burrell’s calc_hr_and_spo2() algorithm for accuracy
- 🧵 Fully wired using GPIO on Raspberry Pi 4
- 🖲️ Start readings via a physical button (GPIO 21)
- 🔌 Safe shutdown via dedicated button (GPIO 4)
- 🐍 Python virtual environment and systemd autostart for headless operation
- 💾 Designed with SD-card flashing and system configuration in mind
- 🛠️ Includes custom LCD display script and button launcher services
🗂 Materials Used
- Raspberry Pi 4
- MAX30102 Pulse Oximeter Sensor Module
- LCD 16x2 display (with contrast pot and optional resistors)
- Jumper wires + breadboard
- Power supply
- Start & Shutdown pushbuttons
💻 Software Stack
- Raspberry Pi OS Bookworm
- Python 3, smbus, RPLCD, numpy, scipy
- Custom Python scripts for sensor data handling and GPIO button logic
- Systemd services for boot-time startup
📎 Full Wiring Diagrams, Install Instructions, and Source Code:
👉 Google document for directions
Please contact me if you have any issues.
License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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