# Servo Component

This section documents the configuration attributes for each built-in servo 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 servo component on your machine, see [Servo](https://docs.viam.com/hardware/common-components/add-a-servo/).
- For the methods you call on a servo in code, see the [Servo API reference](https://docs.viam.com/reference/apis/components/servo/).
- For servo models outside the built-in set, search for `servo` 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 servo models ship with `viam-server`:

| Model | Description |
| --- | --- |
| [`fake`](https://docs.viam.com/reference/components/servo/fake/) | A model used for testing, with no physical hardware. |
| [`gpio`](https://docs.viam.com/reference/components/servo/gpio/) | Supports a hobby servo wired to a board that supports PWM, for example Raspberry Pi 5, Orange Pi, Jetson, or PCAXXXX. |

## Micro-RDK models

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

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