> For the complete documentation index, see [llms.txt](https://yagsl.yassrobotics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://yagsl.yassrobotics.com/reference/json-schema/pidfproperties-json.md).

# pidfproperties.json

Default closed-loop PID + feedforward gains shared by every module. Parsed into `swervelib.parser.json.PIDFPropertiesJson` (each of `drive`/`angle` is a `swervelib.parser.PIDFConfig`).

```json
{
  "drive": {
    "p": 0.5,
    "i": 0.0,
    "d": 0.01
  },
  "angle": {
    "p": 2.0,
    "i": 0.0,
    "d": 0.1
  }
}
```

| Field | Type   | Required | Description                                                                                                                  |
| ----- | ------ | -------- | ---------------------------------------------------------------------------------------------------------------------------- |
| `p`   | number | yes      | Proportional gain.                                                                                                           |
| `i`   | number | yes      | Integral gain.                                                                                                               |
| `d`   | number | yes      | Derivative gain.                                                                                                             |
| `s`   | number | no       | `kS` — static friction feedforward (`SimpleMotorFeedforward`).                                                               |
| `v`   | number | no       | `kV` — velocity feedforward. If left as `0` for the **drive** motor, the parser auto-derives it from the motor's free speed. |
| `a`   | number | no       | `kA` — acceleration feedforward.                                                                                             |

Both `drive` and `angle` are required top-level keys.

## `pidfproperties_sim.json`

Optional. If present, `SwerveParser` uses it instead of `pidfproperties.json` whenever `RobotBase.isSimulation()` is `true` — same shape as above. Use it to tune simulation gains separately from your real robot's gains, without needing to swap files by hand.

{% hint style="warning" %}
There is no more `f` (feedforward) or `iz` (integral zone) field, and no more `output` min/max clamp object — gains are now expressed as plain PID plus a `SimpleMotorFeedforward`-style `s`/`v`/`a`. See [Schema Changes](/reference/schema-changes.md).
{% endhint %}

See [How to Tune PIDF Gains](/how-to-guides/tune-pidf-gains.md) for a tuning procedure and starting-point values.


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