# Base Component

This section documents the configuration attributes for each built-in base model. Use these pages when you are writing a JSON configuration, debugging a config validation error, or looking up the default for a specific attribute.

- For how to add and configure a base component on your machine, see [Base](https://docs.viam.com/hardware/common-components/add-a-base/).
- For the methods you call on a base in code, see the [Base API reference](https://docs.viam.com/reference/apis/components/base/).
- For base models outside the built-in set, search for `base` in the [Viam registry](https://app.viam.com/registry). Each registry module’s configuration is documented in its own README on its registry page.

## Built-in models

The following base models ship with `viam-server`:

| Model | Description |
| --- | --- |
| [`fake`](https://docs.viam.com/reference/components/base/fake/) | A model used for testing, with no physical hardware. |
| [`sensor-controlled`](https://docs.viam.com/reference/components/base/sensor-controlled/) | Wrap other base models and add feedback control using a movement sensor. |
| [`wheeled`](https://docs.viam.com/reference/components/base/wheeled/) | Supports mobile wheeled robotic bases with motors on both sides for differential steering. |

## Micro-RDK models

The following base models ship with the [Micro-RDK](https://docs.viam.com/reference/device-setup/setup-micro/):

| Model | Description |
| --- | --- |
| [`two_wheeled_base`](https://docs.viam.com/reference/components/base/micro-rdk/two_wheeled_base/) | — |