> For the complete documentation index, see [llms.txt](https://headtracker.gitbook.io/head-tracker/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://headtracker.gitbook.io/head-tracker/settings/gui-settings/input.md).

# Input

![](https://3767854731-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-Md5nSb70RWQSfl1nJPs%2Fuploads%2FlJJ6w90VSD1MOYYPjHOP%2Fimage.png?alt=media\&token=e80a7fbd-0f69-4964-96e6-7dfa5d042ddf)

### Pulse Position Modulation (PPM) 

This option allows you to choose which pin you want PPM input on. [**Please Read PPM Input Section**](/head-tracker/getting-started/wiring/ppm-input.md)**.** \
Click inverted to flip signal level logic, depends on your radios ppm output format.

Under Channel viewer click the PPM inputs tab to check if you have a valid signal detected.

![](https://3767854731-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Md5nSb70RWQSfl1nJPs%2F-Md63F9e3fOx9oeN78TL%2F-Md67xSp-ME1xd9-o6MH%2Fimage.png?alt=media\&token=d49d8994-2c25-4844-8623-f02dc0f1d641)

![](https://3767854731-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-Md5nSb70RWQSfl1nJPs%2F-Md63F9e3fOx9oeN78TL%2F-Md67eMG0V40z9KKWwfP%2Fimage.png?alt=media\&token=31db2b87-aaf9-4d3d-9dff-19e1d3ca78a8)

### Serial Bus (SBUS)

* Invert
  * Inverts the SBUS input data
  * **Note:** Version 2.10 does not yet support SBUS input. Feature to come