breathsafe sensor firmware

Author: ModithaM

breathsafe-firmware/README.md

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+# BreathSafe Arduino Code
+
+This folder contains the Arduino source code for the **BreathSafe sensor module**.
+
+## Overview
+The initial plan was to use the **AHT21** (temperature & humidity) and **ENS160** (air quality & VOC) combined sensor setup for data collection. However, during implementation, we were only able to obtain the **AHT21** sensor.
+
+To maintain backend integration and ensure continuous testing, the Arduino code has been **modified** to:
+- Collect **real sensor readings** from the **AHT21** sensor.
+- Submit **dummy values** for the **ENS160-related air quality data** to the backend.
+
+## Notes
+- The dummy values are placeholders and can be easily replaced once the ENS160 sensor is available.
+- The backend endpoints remain the same, ensuring compatibility for future updates.
+
+## Future Work
+Once the ENS160 sensor is available:
+1. Integrate real readings for air quality metrics (TVOC, eCO2, etc.).
+2. Remove dummy data submission logic.
+3. Re-test backend data flow with both sensors active.
+
+---
+
+**Author:** Moditha Marasingha  
+**Project:** BreathSafe  
+**Language:** Arduino (C++)