# Radiation Shield

### How the Sensors Work

The radiation shield houses integrated environmental sensors to ensure accurate readings:

* **Temperature**: Monitored via the **SHT31D & MCP9808** which measures ambient air temperature using a precision thermistor.
* **Relative Humidity**: Detected by the **SHT31D**, which calculates moisture levels via capacitance changes in a polymer layer.
* **Atmospheric Pressure**: Measured by the **BMP390**, a piezoresistive sensor that converts pressure changes into digital signals.

**Wiring**:\
All three sensors connect via **I2C** (shared SDA/SCL lines) to minimize wiring complexity. The radiation shield’s passive ventilation design protects sensors from direct sunlight, precipitation, and debris while maintaining airflow for precision.

### Instruction Slides for Wiring the Sensors

{% embed url="<https://docs.google.com/presentation/d/1diS6moU7ZcuMMJtIDO2LEwxRn5aVLM7N/edit?ouid=102244773211795243299&rtpof=true&sd=true&usp=sharing>" %}

## Assembling the Radiation Shield

The radiation shield is a passively ventilated enclosure that protects temperature, humidity, and pressure sensors from environmental interference while maintaining airflow for accurate measurements. Its multi-plate design minimizes exposure to direct sunlight, precipitation, and debris, while allowing ambient air circulation. The shield reduces radiative heating and thermal inertia, ensuring sensors measure true ambient air conditions rather than artificial microclimates.

### Instruction Slides for Assembling the Radiation Shield

{% embed url="<https://docs.google.com/presentation/d/1QULsoqzH89nLaFRf2utPK3nYZIs7HVXe/edit?ouid=102244773211795243299&rtpof=true&sd=true&usp=sharing>" %}

### Tutorial Video for Assembling the Radiation Shield

This video demonstrates the entire assembly of the instrument. There is only one video in this particular playlist.

{% embed url="<https://youtube.com/playlist?list=PL_rvcKZhmIf1Y88Ddw8Gxk7ubF22Zb2Bt&si=ODQ-XtooZQkHrUPF>" %}