> For the complete documentation index, see [llms.txt](https://navixy.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://navixy.com/docs/user/guide/devices-and-settings/vehicle-sensors/discrete-sensors/ignition-source.md). # Ignition source This page covers creating an ignition sensor on the Navixy platform for devices that use virtual ignition: Derived from the motion sensor or on-board voltage, instead of a direct ignition-cable connection. {% hint style="info" %} This is the **platform-side sensor**. To choose *how the device itself* detects ignition (digital input, on-board voltage, or motion), use the [Ignition source](/docs/user/guide/devices-and-settings/location-and-movement/ignition-source.md) under Location and movement. {% endhint %} ## How virtual ignition works Some devices do not allow connecting the ignition cable to the device input to transmit the ignition status. Instead, they use virtual ignition based on the motion sensor readings or the vehicle's onboard voltage. When the engine is running, the alternator (generator) charges the battery and raises the vehicle's electrical voltage above its resting level, typically above 13.2 V. The device detects this voltage increase and uses it to determine that the engine is on. The ignition detection by the movement sensor is convenient if the device is not connected to the vehicle's onboard electrical system. However, when the vehicle is towed, the ignition is also detected as the vehicle moves, although the engine doesn't start. ## Settings The ignition source is selected from a drop-down list. If the ignition source is the onboard power supply voltage, the range of values in which the ignition is considered switched on must be selected. ## Availability Available on devices that expose a suitable input or support virtual ignition. ## See also * [Ignition source](/docs/user/guide/devices-and-settings/location-and-movement/ignition-source.md): set the device-side ignition detection mode. * [Engine hours](/docs/user/guide/devices-and-settings/location-and-movement/engine-hours.md): can use an ignition sensor as its data source. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://navixy.com/docs/user/guide/devices-and-settings/vehicle-sensors/discrete-sensors/ignition-source.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.