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🔌 Circuit Diagram. MAX30100 Pin ESP8266 Pin; VCC: 3.3V: GND: GND: SDA: D2 (GPIO4) SCL: D1 (GPIO5) 📌 Use 3.3V only for MAX30100 — 5V may damage the sensor. 🚀 ESP8266 Firmware Overview. Reads heart ...
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