H-Flow (Optical Flow and Distance Sensor Module)

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.

Feature

• Integrated Optical Flow and Rangefinder Module
• PixArt Optical Flow Sensor for Accurate Motion Tracking
• Broadcom ToF Sensor for Precise Distance Measurement
• Infrared LED for Optical Low-Light Performance
• DroneCAN Protocol

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
    
• Broadcom AFBR-S50LV85D Time-of-Flight Distance Sensor
  
  • 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
    
• 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)

Reference Links

Package Includes:

• 1x H-Flow
• 4-pin GH cable
• 2x M2.5 Screws
• 2x M2.5 Nylon Locking Hex Nuts

Dimension

PCB Only