๐ ๏ธ MAKER GUIDEJul 01, 2026โขโฑ๏ธ 1 min readโข๐ณ๐ต Tested in Nepal
DIY Wearable Pulse Oximeter & SpO2 Heart Rate Monitor with MAX30102
Monitor heart rate (BPM) and blood oxygen saturation (SpO2) in real time using the MAX30102 optical sensor and ESP32 with OLED display.
๐ ๏ธ BILL OF MATERIALS (BOM)
Required Hardware & Component Checklist
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Estimated Total (6/6 items):
NPRย 2,230
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NPRย 750
NPRย 650
NPRย 500
NPRย 40
NPRย 90
NPRย 200
DIY Wearable Pulse Oximeter & SpO2 Heart Rate Monitor with MAX30102
The MAX30102 Sensor Module shines red and infrared LEDs through finger capillary blood vessels to calculate pulse rate and blood oxygen (SpO2).
Hardware Bill of Materials:
- Microcontroller: Arduino Nano V3.0 Solderless
- Biometric Sensor: MAX30102 Heart Rate Pulse Oximeter Sensor Module
- Display: 0.91 inch OLED module blue OLED 128X32 GND-VCC-SCL-SDA
- Alert & Power: Active Buzzer + Type C TP4056 Charger Module + 18650 3.7V 3000mAh Battery
Circuit Pinout & Wiring Connections:
| Component / Sensor Pin | Arduino Nano Pin | Function / Description |
|---|---|---|
| MAX30102 VCC / GND | 3.3V / GND | Photoplethysmography Sensor Power |
| MAX30102 SDA | Pin A4 | I2C Data Line |
| MAX30102 SCL | Pin A5 | I2C Clock Line |
| MAX30102 INT | Pin D2 (INT0) | Optical FIFO Data Ready Interrupt |
| 0.91" OLED SDA / SCL | Pin A4 / Pin A5 | Shared I2C Display Bus |
| Active Buzzer (+) | Pin D4 | Heartbeat Tone Chime |
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