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The Holybro PMW3901 Optical Flow Sensor is the UART version of the PMW3901 module with a built-in BEC. It comes pre-soldered with a 6-pin JST GH connector that is made to connect right to the TELEM ports on most flight controllers, so installation is largely plug and play.
It is compatible with PX4 and with ArduPilot; the data format is the same as the discontinued CX-OF sensor, which means existing configuration knowledge carries over.
The listing describes the module as a compact, lightweight sensor for drones, UAVs and robotics that improves flight stability and navigation through high-precision optical flow sensing.
PMW3901 optical flow sensing: high-precision measurement of movement over the ground.
Motion tracking and velocity estimation: accurate velocity data for the flight controller.
Real-time position movement detection: helps hold position without GPS.
Pre-soldered 6-pin JST GH connector: plugs into a TELEM port.
Built-in BEC: the module has its own regulator.
Compact and lightweight: suits small aircraft and robots.
An optical flow sensor is a tiny downward-facing camera chip that watches the ground texture move beneath the aircraft. From that motion, the flight controller can estimate speed and drift, which is very useful indoors or anywhere GPS is weak or unavailable.
Combined with a height source, the flight controller can hold position more steadily and navigate more precisely at low altitude.
Position hold in GPS-denied environments such as indoors
Improving low-altitude stability
Drone and UAV research projects
Robotics that need motion estimation
Velocity estimation in autonomous flight
The sensor is the UART version and uses a baud rate of 19200 at 95Hz frame rate. It is listed as compatible with PX4 and ArduPilot. Check that your flight controller has a spare TELEM port and that your firmware version supports optical flow.
The package contains one Holybro PMW3901 optical flow sensor.
Item type: sensor
Sensor type: optical flow sensor
Interface: UART
Baud rate: 19200
Frame rate: 95Hz
Connector: pre-soldered 6-pin JST GH
Current: 10mA
1 x Holybro PMW3901 optical flow sensor
PX4 and ArduPilot builders who want optical-flow position and velocity data on a TELEM port.
UART, through a pre-soldered 6-pin JST GH connector.
PX4 and ArduPilot.
19200.
95Hz.
Yes, it has a built-in BEC.
The listing says the data format is the same as the discontinued CX-OF product.
| Brand | Holybro |
|---|---|
| Baud Rate | 19200 |
| Connector | 6-pin JST GH |
| Frame Rate | 95 Hz |
| Interface Type | UART |
| Software Compatibility | PX4, ArduPilot |
| Selling unit | PCS |
