H-Flow (DroneCAN) 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掳
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
Broadcom AFBR-S50LV85D Time-of-Flight Distance Sensor
Integrated 850 nm laser light source
Field-of-View (FoV) of 12.4掳 x 6.2掳 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掳 x 2掳 to illuminate between 1 and 3 pixels
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)