> For the complete documentation index, see [llms.txt](https://3dpaws.comet.ucar.edu/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://3dpaws.comet.ucar.edu/building-3d-paws/building-the-core-instruments.md).

# Building the Core Instruments

Assembly overview for the four core instruments used in a typical 3D-PAWS weather station.

### Overview

A typical 3D-PAWS weather station includes four core instruments:

* [**Rain Gauge**](/building-3d-paws/building-the-core-instruments/tipping-bucket-rain-gauge.md) – measures precipitation
* [**Anemometer**](/building-3d-paws/building-the-core-instruments/anemometer.md) – measures wind speed
* [**Wind Vane**](/building-3d-paws/building-the-core-instruments/wind-vane.md) – measures wind direction
* [**Radiation Shield**](/building-3d-paws/building-the-core-instruments/radiation-shield.md) – houses sensors used to measure air temperature, relative humidity, and atmospheric pressure

These instruments use 3D-printed components, sensors, and standardized wiring connections that are assembled before being connected to the data logger and installed on the station.

Detailed assembly procedures, parts lists, sensor information, and testing guidance are provided on the individual instrument pages.

{% hint style="info" %}
The core instruments can be assembled in any order. However, the **rain gauge typically requires additional time for calibration**, so it may be helpful to assemble it early in the build process.
{% endhint %}

***

#### After Assembly

Once the core instruments are assembled, connect them to the  Raspberry Pi and verify that the sensors are operating correctly before field deployment. See [**Testing the Sensors**](/building-3d-paws/building-the-core-instruments/testing-the-sensors.md).

***

#### Additional Instruments

3D-PAWS can also be configured with additional instruments for other environmental measurements, including water level, snow depth, soil conditions, air quality, and heat stress.

See [**Adding Additional Instruments**](/building-3d-paws/adding-additional-instruments.md) for available configurations.


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