# Overview

### Overview

The Holybro H-Flow is a compact optical flow and distance sensor module that combines a PixArt PAA3905E1 optical flow sensor, a Broadcom AFBR-S50LV85D distance sensor, and an InvenSense ICM-42688-P 6-axis IMU. This all-in-one design simplifies installation, while the onboard infrared LED enhances visibility in low-light conditions.

The H-Flow features a Pixhawk-standard 4-pin CAN connector, ensuring seamless integration with Pixhawk-compatible controllers via the CAN port. Utilizing the DroneCAN protocol, it offers reliable and high-speed data transmission between the sensor and the flight controller.

### Specification

* PixArt PAA3905E1 Optical Flow Sensor
  * Tracks under low light conditions of >5 lux
  * Effective Viewing angle up to 42°
  * Wide working ranges from 80mm up to 30m 
  * Up to 7.4 rad/s
  * 40mW IR LED built onto the board for improved low-light operation<br>
* Broadcom AFBR-S50LV85D Time-of-Flight Distance Sensor<br>
  * Integrated 850 nm laser light source
  * Field-of-View (FoV) of 12.4° x 6.2° with 32 pixels
  * Typical distance sensing range up to 30m
  * Operation of up to 200k Lux ambient light
  * Works well on all surface conditions
  * Transmitter beam of 2° x 2° to illuminate between 1 and 3 pixels<br>
* InvenSense ICM-42688-P 6-Axis IMU
* STM32F412CEU6 MCU
* Pixhawk Standard CAN Connector (4 Pin JST GH)
* Compact Form Factor
* Software-Controlled CAN Termination
* Weight: 15.2g (3.5g without casing)


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