> For the complete documentation index, see [llms.txt](https://docs.arkelectron.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.arkelectron.com/products/sensor/ark-flow.md).

# ARK Flow

ARK Flow is an open source [DroneCAN](https://docs.px4.io/main/en/dronecan/) [optical flow](https://docs.px4.io/main/en/sensor/optical_flow.html), [distance sensor](https://docs.px4.io/main/en/sensor/rangefinders.html), and IMU module, with a [PixArt PAW3902](https://www.pixart.com/products-detail/93/PAW3902JF-TXQT) optical flow sensor and a [Broadcom AFBR-S50LV85D](https://www.broadcom.com/products/optical-sensors/time-of-flight-3d-sensors/afbr-s50lv85d) time-of-flight distance sensor. It works with PX4, ArduPilot and ROS 2 through [ros2\_dronecan](https://github.com/ARK-Electronics/ros2_dronecan). USA built, FCC compliant and [Blue Framework listed](https://tyrionprod.servicenowservices.com/gsp?id=framework_list).

[Buy the ARK Flow](https://arkelectron.com/product/ark-flow/)

| Page                                                                          | Contents                                                                          |
| ----------------------------------------------------------------------------- | --------------------------------------------------------------------------------- |
| [Firmware](/products/sensor/ark-flow/firmware.md)                             | Updating, node parameters, downloads and release notes                            |
| [Hardware Reference](/products/sensor/ark-flow/hardware.md)                   | Specifications, pinout, LEDs, wiring, mounting, 3D model, case, schematic and BOM |
| [PX4 Instructions](/products/sensor/ark-flow/px4-instructions.md)             | Connecting and configuring with PX4                                               |
| [ArduPilot Instructions](/products/sensor/ark-flow/ardupilot-instructions.md) | Connecting and configuring with ArduPilot                                         |
| [DroneCAN Messages](/products/sensor/ark-flow/dronecan-messages.md)           | Messages the ARK Flow publishes                                                   |


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