BetaFPV Matrix 1S Brushless Flight Controller AIO 3IN1/4IN1, STM32G473, ELRS 2.4G, 12A/18A

Overview

The BetaFPV Matrix 1S Brushless Flight Controller is a 1S whoop flight controller platform offered in two versions: Matrix 1S 3IN1 (FC + ESC + onboard Serial ELRS 2.4GHz RX; no analog OSD) and Matrix 1S 4IN1 (adds Betaflight OSD and solder pads for an external analog VTX). It uses the STM32G473CEU6 MCU and a cross-style board layout, and is designed for straightforward installation on 1S micro builds.

Key Features

• Two architectures: 3IN1 for HD digital builds (with SH1.0-6Pin HD digital VTX port and motor plugs) and 4IN1 for analog builds (with OSD and external analog VTX solder pads).
• MCU: STM32G473CEU6 (168MHz); stated as 55% faster processing than F411.
• ESC output: 12A continuous, 18A peak; supports DSHOT300 and DSHOT600.
• New BEC: 5V/3A; IMU-independent 3.3V LDO power supply design.
• Onboard Serial ELRS 2.4GHz receiver (V3.4.3), CRSF protocol.
• Durability note: 1mm board; solder-free oriented installation features on the 3IN1 version.

Specifications

Flight Controller (FC)

Version-Specific I/O

Weight

ESC

Comparison Table (as provided)

BEC Test Data (as shown)

• Constant 3A current discharge: Input 4.35V → Output 5.05V; 3.85V → 5.03V; 3.35V → 5.02V; 2.85V → 4.81V
• Constant 4.8V voltage discharge: Input 4.35V → Output 5.34A; 3.85V → 4.51A; 3.35V → 3.75A; 2.85V → 3.06A

Ports & Setup Notes (from diagrams)

• USB pinout shown: USB (GND, DM, DP, 5V).
• 3IN1 board labels shown include: RX3, RX2, TX2, TX3; BATT-, BATT+(1S), 5V, GND; SBUS (RX1), RX4, TX4; LED; ELRS-RX-ANT; ELRS-TXD, ELRS-RXD; FC-RX-BOOT; ELRS RX LED (Green); FC Status LED (Orange); FC Mode LED (Blue); ESC1/ESC2/ESC3/ESC4.
• 4IN1 board labels shown include: SX128X; ICM42688P; Blackbox 16M; AT7456E; ELRS-RX-ANT; ELRS-TXD, ELRS-RXD; ESP8285; STM32G473; FC-RX-BOOT; FC Status LED; FC-Mode LED; ESC1/ESC2/ESC3/ESC4; plus pad labels including 5V/LED/GND and 5V/GND/TX1/Vout/Vin.

Betaflight Ports configuration shown (3IN1)

• With onboard ELRS RX (default): set UART4 to Configuration/MSP and UART3 to Serial RX (no other options enabled for UART3). Receiver Mode: Serial-based Receiver; Serial Receiver Provider: CRSF.
• With DJI O4 Air Unit RX (SBUS): set UART4 to Configuration/MSP and UART1 to Serial RX (no other options enabled for UART1). Receiver Mode: Serial-based Receiver; Serial Receiver Provider: SBUS.

Betaflight Ports configuration shown (4IN1)

• When setting up analog VTX: set Peripherals for UART1 to VTX (TBS Smart audio).
• For the receiver: configure UART3 as Serial RX.
• CRSF Protocol RX note shown: TBS Nano / ELRS Series RX.

Firmware

• FC firmware (3IN1): Betaflight_4.5.1_BETAFPVG473
• FC firmware (4IN1): Betaflight_4.5.2_BETAFPVG473_V2
• ESC firmware base (BB51 Bluejay): A_X_5_96_v0.19.2.hex (supports DSHOT300/DSHOT600; mentions 24KHz/48KHz/96KHz fixed PWM frequency options and custom start-up melodies)

Important: Starting Jan 5, 2026, the 3IN1 FC is stated to ship with a BMI270 gyroscope. Verify the gyroscope version before flashing firmware. The Matrix 1S 3IN1 and 4IN1 require different firmware.

Note: Avoid flashing ESC firmware with a shorter interval; it is stated this may increase the chance of stalling and damaging the flight controller.

Manuals & Downloads

• 3IN1 firmware + CLI dump: https://support.betafpv.com/hc/en-us/articles/41037090524697-Firmware-for-Matrix-1S-Brushless-Flight-Controller-3IN1-HD
• 4IN1 firmware + CLI dump: https://support.betafpv.com/hc/en-us/articles/48215862783769-Firmware-for-Matrix-1S-Brushless-Flight-Controller-4IN1
• Betaflight 4.5.1 release notes: https://github.com/betaflight/betaflight/releases/tag/4.5.1
• Betaflight 4.5.2 release notes: https://github.com/betaflight/betaflight/releases/tag/4.5.2
• Bluejay project: https://github.com/bird-sanctuary/bluejay
• Bluejay releases: https://github.com/bird-sanctuary/bluejay/releases
• ESC Configurator: https://preview.esc-configurator.com/
• BLHeliSuite16714903: https://github.com/4712/BLHeliSuite/releases/tag/16714903
• ELRS firmware flashing guide: https://support.betafpv.com/hc/en-us/articles/4404231679129-How-to-Flash-Firmware-of-ELRS-RX-TX

What’s Included

Matrix 1S Brushless Flight Controller (3IN1) package

• 1 * Matrix 1S Brushless Flight Controller (3IN1)
• 1 * Type-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

Matrix 1S Brushless Flight Controller (4IN1) package

• 1 * Matrix 1S Brushless Flight Controller (4IN1)
• 1 * Type-C to SH1.0 Adapter
• 1 * SH1.0-4Pin Adapter Cable
• 4 * M1.2*4 Self-tapping Screws
• 4 * M1.4*5 Self-tapping Screws
• 4 * Shock Absorbing Balls

Attention

• Crafted for newcomers and recreational pilots, the Matrix FC uses a 1mm board for durability and is designed for easy installation.
• Flight controllers are covered for manufacturer defects. Issues arising from user errors, physical crash damage, damage during installation or dismantling, modifications, power surges, electrical fires, or water exposure are not covered.

For compatibility questions (3IN1 vs 4IN1 selection, wiring, or firmware), contact support at https://rcdrone.top/ or support@rcdrone.top.

Details

Choose between the 3IN1 board for HD digital builds and the 4IN1 option that adds Betaflight OSD and analog VTX support.

The updated 5V/3A BEC is characterized for stable output across typical 1S input voltages.

Solder-free connectors simplify installs, with a dedicated HD digital VTX port and plug-in motor leads.

For analog builds, the 4IN1 version provides solder pads to wire an external analog VTX.

Setup notes cover common Betaflight port mapping for HD digital builds and the onboard Serial ELRS receiver.

Configuration guidance focuses on analog VTX wiring and CRSF settings for the onboard Serial ELRS receiver.

Included accessories support quick bench setup and installation, with a USB adapter, cable, and mounting hardware.