Holybro H-Flow Optical Flow and Distance Sensor Module with IMU for Pixhawk Drones

Introduction

The Holybro H-Flow is an advanced, compact module designed to significantly enhance the autonomous capabilities of drones. It combines critical sensing technologies - optical flow, distance sensing, and a 6-axis Inertial Measurement Unit (IMU) - into a single, easy-to-install unit. This integrated approach simplifies wiring and setup, making it an excellent choice for drone builders and enthusiasts looking to achieve more stable flight and precise navigation, especially in GPS-denied environments. The built-in infrared LED ensures optimal performance even in low-light conditions.

Key Advantages

• Integrated Sensing: Combines optical flow, distance measurement, and IMU for comprehensive navigation data.
• Precise Motion Tracking: Utilizes the PixArt PAA3905E1 optical flow sensor for accurate movement detection.
• Accurate Distance Measurement: Features the Broadcom AFBR-S50LV85D Time-of-Flight sensor for reliable distance readings up to 30 meters.
• Low-Light Performance: Integrated 40mW IR LED enhances optical sensor functionality in dimly lit environments.
• Stable Flight: The onboard 6-axis IMU (InvenSense ICM-42688-P) provides crucial stabilization data.
• Seamless Integration: Equipped with a standard Pixhawk 4-pin CAN connector for easy connection to compatible flight controllers.
• Robust Communication: Employs the DroneCAN protocol for reliable and high-speed data transfer.
• Compact and Lightweight: Designed for minimal impact on drone weight and dimensions.

Technical Specifications

• Optical Flow Sensor: PixArt PAA3905E1
• Optical Flow Tracking Conditions: Low light >5 lux
• Optical Flow Field of View: Up to 42°
• Optical Flow Range: 80 mm to 30 m
• Optical Flow Speed: Up to 7.4 rad/s
• IR LED: 40 mW built-in for low-light enhancement
• Distance Sensor: Broadcom AFBR-S50LV85D Time-of-Flight
• Distance Sensor Laser: Integrated 850 nm laser light source
• Distance Sensor Field of View: 12.4° x 6.2° with 32 pixels
• Distance Sensor Range: Up to 30 m typical detection range
• Distance Sensor Ambient Light Tolerance: Up to 200k lux
• Distance Sensor Surface Compatibility: Works well on all surfaces
• Distance Sensor Transmitter Beam: 2° x 2°
• IMU: 6-axis InvenSense ICM-42688-P
• MCU: STM32F412CEU6
• Interface: Standard Pixhawk CAN connector (4-pin JST GH)
• CAN Termination: Software-controlled
• Weight: 15.2 g (3.5 g without casing)

Applications

The Holybro H-Flow is perfect for a wide range of unmanned aerial vehicle applications, including advanced FPV systems, autonomous drones, aerial inspection platforms, mapping drones, and any UAV requiring precise indoor or outdoor navigation, hover stability, and obstacle avoidance assistance. It's particularly valuable for missions where GPS signals are unreliable or unavailable.

Compatibility

The module utilizes a standard Pixhawk 4-pin CAN (JST GH) connector, ensuring broad compatibility with flight controllers supporting the DroneCAN protocol, such as Pixhawk series controllers. The software-controlled CAN termination simplifies integration into various setups.

FAQ

What is the Holybro H-Flow module used for?

The Holybro H-Flow module is used to enhance drone navigation and stability. It combines an optical flow sensor for motion tracking, a distance sensor for altitude and rangefinding, and a 6-axis IMU for precise orientation data, making it ideal for autonomous flight and GPS-denied environments.

What are the key components of the Holybro H-Flow?

The Holybro H-Flow integrates the PixArt PAA3905E1 optical flow sensor, the Broadcom AFBR-S50LV85D distance sensor, and the InvenSense ICM-42688-P 6-axis IMU. It also includes an STM32F412CEU6 MCU and an infrared LED for low-light operation.

How does the Holybro H-Flow connect to a flight controller?

The module uses a standard Pixhawk 4-pin CAN (JST GH) connector and communicates using the DroneCAN protocol. This ensures seamless integration with compatible Pixhawk flight controllers and other DroneCAN-enabled peripherals.

What is the maximum detection range of the distance sensor?

The Broadcom AFBR-S50LV85D distance sensor integrated into the Holybro H-Flow has a typical detection range of up to 30 meters. It works well on various surfaces and is tolerant to ambient light conditions up to 200k lux.

Where can I buy the Holybro H-Flow module with fast delivery?

You can buy the Holybro H-Flow module at HTDRONE, a specialized FPV and UAV drone parts store based in Poland. We offer fast international delivery via DHL for customers worldwide.