# ARK Flow MR

### Pinout

#### CAN - 4 Pin JST-GH

<table><thead><tr><th width="134">Pin Number</th><th width="237">Signal Name</th><th>Voltage</th></tr></thead><tbody><tr><td>1</td><td>5V</td><td>5.0V</td></tr><tr><td>2</td><td>CAN_P</td><td>5.0V</td></tr><tr><td>3</td><td>CAN_N</td><td>5.0V</td></tr><tr><td>4</td><td>GND</td><td>GND</td></tr></tbody></table>

#### CAN - 4 Pin JST-GH

<table><thead><tr><th width="134">Pin Number</th><th width="237">Signal Name</th><th>Voltage</th></tr></thead><tbody><tr><td>1</td><td>5V</td><td>5.0V</td></tr><tr><td>2</td><td>CAN_P</td><td>5.0V</td></tr><tr><td>3</td><td>CAN_N</td><td>5.0V</td></tr><tr><td>4</td><td>GND</td><td>GND</td></tr></tbody></table>

#### Debug - 6 Pin JST-SH

<table><thead><tr><th width="153">Pin Number</th><th width="210">Signal Name</th><th>Voltage</th></tr></thead><tbody><tr><td>1</td><td>3.3V</td><td>3.3V</td></tr><tr><td>2</td><td>USART2_TX</td><td>3.3V</td></tr><tr><td>3</td><td>USART2_RX</td><td>3.3V</td></tr><tr><td>4</td><td>FMU_SWDIO</td><td>3.3V</td></tr><tr><td>5</td><td>FMU_SWCLK</td><td>3.3V</td></tr><tr><td>6</td><td>GND</td><td>GND</td></tr></tbody></table>

### Firmware

{% file src="/files/Ko0hpTA9SmR8SL72LyNX" %}
ARK Flow MR Firmware
{% endfile %}

{% file src="/files/3yQ4f32F0pRO2votxDHp" %}
ARK Flow MR Bootloader
{% endfile %}

## Release Notes

* 88-1.16.3c45b562 - 2025-9-26
  * Migrate to build server
* 88-1.16.afb2c08b - 2025-8-6
  * AFBRS50: Fix long range measurement publishing
* 88-1.16.2248a40e - 2025-7-10
  * [AFBRS40: fix Range Mode switching](https://github.com/PX4/PX4-Autopilot/pull/25185)
* 88-1.16.d0bfa548 - 2025-6-12
  * [AFBRS50 fix scheduling and refactor](https://github.com/PX4/PX4-Autopilot/pull/24837)
* 88-1.15.82ff8744- 2025-6-11
  * Add DroneCAN RawIMU publisher
* 88-1.16.c8bed86b - 2025-2-26
  * Default to Long Range Mode (SENS\_AFBR\_MODE = 1)
  * Default to 5Hz output rate over 4m (SENS\_AFBR\_L\_RATE = 5)
* 88-1.16.61036f77 - 2025-2-7
  * Update to [AFBR 1.6.5 API](https://github.com/Broadcom/AFBR-S50-API/releases/tag/v1.6.5)
    * Improved distance sensor performance
  * Fix PAA3905 challenging surface detected spam
    * Only notify once every second


---

# Agent Instructions: 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:

```
GET https://docs.arkelectron.com/products/sensor/ark-flow-mr.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.