I lately acquired the BetaFPV Matrix 3in1 flight controller—a 1S whoop FC board designed particularly for the DJI O4 Air Unit—and after testing it for every week, I’m excited to share my hands-on replace. On this article, I’ll clarify the design, options and pinout of the Matrix 3in1 FC, and setup it up.
The Matrix might be bought individually, and it additionally comes with the Meteor75 Professional, which I lately reviewed: https://oscarliang.com/betafpv-meteor75-pro-o4-whoop/
The place to Purchase
Get the BetaFPV Matrix 3in1 FC from:
What are included:
- 1 * Matrix 1S Brushless Flight Controller (3IN1 HD)
- 1 * Sort-C to SH1.0 Adapter
- 1 * SH1.0-4Pin Adapter Cable
- 1 * SH1.0-6Pin Adapter Cable
- 4 * M1.2*4 Self-tapping Screws
- 4 * M1.4*5 Self-tapping Screws
- 4 * Shock Absorbing Balls
Specs
Flight Controller (FC):
- MCU: STM32G473CEU6
- Gyro: ICM42688P
- Blackbox Reminiscence: 16MB
- Sensor: Voltage & Present
- BEC: 5V/3A
- UART:
- UART 1 (RX Solely/SBUS)
- UART 2 (Free)
- UART 3 (For Serial RX)
- UART 4 (Free/HD MSP)
- RX: Serial ELRS 2.4GHz (ExpressLRS V3.4.3)
- FC Firmware: Betaflight_4.5.1_BETAFPVG473
- USB Port: SH1.0-4Pin
- HD Digital VTX Port: SH1.0-6Pin
- Motor Plug: JST1.25-3Pin
- Battery Connector: BT2.0
- Mounting Dimension: 25.5mm x 25.5mm
- Weight: 3.2±0.1g (battery connector excluded), 4.2±0.1g (battery connector included)
ESC:
- Energy Enter: 1S Solely
- Present Ranking: 12A steady, 18A peak
- ESC Firmware: A_X_5_96_v0.19.2.hex (for BB51 Bluejay firmware)
- Assist Protocol: DSHOT300, DSHOT600
Design and Options
The BetaFPV Matrix 3in1 FC is designed for the DJI O4 Air Unit (Lite) for use on 1S micro FPV drones. A 4in1 model can also be being launched, which integrates analog OSD and will probably be suitable with each HD and analog FPV programs.
What’s 3in1? Nicely, it combines the flight controller, ESC, and ELRS 2.4GHz RX right into a single board, therefore 3in1.
From my energy consumption testing whereas reviewing the DJI O4, I discovered that the O4 attracts about 1.2A at 5V. The onboard 5V/3A BEC on the Matrix supplies loads of energy to ship a constant voltage to the O4. Moreover, the FC options an SH1.0 6-pin connector, making it plug-and-play with the DJI O4 proper out of the field—no soldering required.
The O4 Air Unit is understood to carry out poorly and even minimize out when the enter voltage drops under 3.7V. With the Matrix’s 5V BEC, it prevents the enter voltage drop under this degree. I examined the FC extensively, even flying till my battery voltage dropped under 2.8V, and my video hyperlink remained stable.
Like many latest whoop FCs from BetaFPV, the Matrix 3in1 sacrifices a built-in USB port to avoid wasting weight. Nevertheless, it does supply a small connector for an exterior USB-C adapter.
The ESCs are rated for 12A steady and 18A peak, which is extraordinarily sturdy for 1S micro drones—greater than sufficient for nearly any setup. They arrive with Bluejay firmware pre-installed (A_X_5_96_v0.19.2).
This FC additionally options motor plugs, which permit for solder-free motor replacements, and it contains 16MB of reminiscence for Blackbox logging, a present sensor, three full UARTs plus an additional RX pin, and an built-in ExpressLRS 2.4GHz receiver. The FC comes with a right-angle BT2.0 battery connector.
Wiring Diagrams and Pinout
Easy methods to Bind Receiver
There are a number of methods to bind ELRS receivers, as described in my tutorial: https://oscarliang.com/bind-expresslrs-receivers/
Right here’s my favourite technique:
- Join the FC to Betaflight Configurator.
- Click on on the Receiver tab and press the Bind Receiver button on the backside proper.
- The receiver LED ought to show a double blink, indicating that it’s in bind mode.
- Go to the ExpressLRS LUA script in your radio and choose the “Bind” possibility.
- After just a few seconds, the receiver ought to present a stable mild, indicating a profitable bind. If it doesn’t, guarantee your TX module has the identical main model because the receiver.
Easy methods to Flash Receiver
The onboard ELRS 2.4GHz RX might be up to date by way of the ExpressLRS Configurator. For an in depth tutorial, try: https://oscarliang.com/setup-expresslrs-2-4ghz/#Flash-RX-Firmware-via-Betaflight-Passthrough
- Plug in your FC to your pc (be certain Betaflight Configurator is closed).
- Connect with the ExpressLRS Configurator.
- Select the goal “BETAFPV 2.4GHz AIO RX.”
- Flash the firmware utilizing the Betaflight Passthrough possibility.
Conclusion
The BetaFPV Matrix 3in1 flight controller is a sport changer for any 1S setup utilizing the most recent DJI O4 Air Unit. It not solely resolves the facility difficulty with the O4 but in addition delivers a clean plug and play person expertise with spectacular weight financial savings and sturdy efficiency.
