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Flight Controller G474-Heli
Brand: Matek
Product Code: G474-Heli
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Flight Controller G474-Heli
Description
1. Product Summary
1.1. Product Description
The Matek Systems G474-HELI is a high-performance flybarless flight controller designed specifically for RC helicopters. Powered by a STM32G474CE ARM Cortex-M4 processor running at 170MHz, it features an advanced ICM42688-P IMU and SPL06 barometer for stable flight control, rotor dynamics, and altitude feedback. The controller includes on-board 128 MB flash memory for BlackBox data logging, multiple PWM servo outputs, and supports up to 6S LiPo input voltage. Compatible with Rotorflight firmware (target: MATEKG474HELI), it provides precise, low-latency control optimized for flybarless helicopter applications.
1.2. Product Features
- MCU: STM32G474CE (ARM Cortex-M4, 170 MHz).
- IMU: ICM42688-P high-precision 6-axis gyro/accelerometer.
- Barometer: SPL06 (SPL06L) digital pressure sensor.
- BlackBox Memory: 128 MB onboard flash storage.
- Input Voltage: 5.4 V – 30 V (2S – 6S LiPo supported).
- PWM Outputs: Up to 8 channels (servos, ESC, RPM, LED).
- UART Ports: 3 × UARTs (for telemetry, GPS, receiver, etc.).
- I²C Bus: 1 channel for external sensors.
- Mounting Pattern: Compact layout 38 × 26 × 13 mm.
- Weight: Approx. 15 g (without pins).
- Firmware Target: Rotorflight “MATEKG474HELI”.
- Use Case: Dedicated for RC helicopter flybarless systems.
1.3. Applications
- Flybarless RC Helicopters: Precise cyclic and collective pitch control.
- Scale Helicopter Builds: Advanced stabilization and telemetry feedback.
- Research UAV Systems: Compact controller for helicopter dynamics testing.
- Rotorflight Projects: Full compatibility with open-source Rotorflight firmware.
2. Technical Specifications
Table 2-1. G474-HELI System Specifications
| Manufacturer | Matek Systems |
| Model | G474-HELI Flight Controller |
| Microcontroller | STM32G474CE (ARM Cortex-M4, 170 MHz) |
| IMU | ICM42688-P 6-axis gyro/accelerometer |
| Barometer | SPL06 / SPL06L |
| Input Voltage Range | 5.4 V ~ 30 V (2S – 6S LiPo) |
| PWM Outputs | 8 channels (servos, ESC, RPM, LED) |
| UART Ports | 3 × UARTs (UART1, UART2, UART3) |
| I²C Bus | 1 × I²C |
| BlackBox Memory | 128 MB onboard flash |
| Current Sensor | External (3.3 V compatible) |
| Mounting Dimensions | 38 × 26 × 13 mm |
| Weight | ≈ 15 g |
| Firmware Target | Rotorflight (MATEKG474HELI) |
3. Electrical Characteristics
Table 3-1. Electrical Parameters
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage | 5.4 | 12 | 30 | V |
| Operating Current (avg.) | – | 80 | 100 | mA |
| PWM Output Voltage | 3.3 | 3.3 | 3.3 | V |
| Operating Temperature | -20 | 25 | 80 | °C |
4. Integration & Usage Notes
- Designed for Rotorflight firmware; use target
MATEKG474HELIin configurator. - Supports servo and motor mixing typical for flybarless RC helicopter systems.
- No internal current sensor — external 3.3 V compatible sensor required for telemetry.
- Ensure firmware calibration after installation (gyro alignment, sensor trim, etc.).
- Verify correct wiring to servos and ESCs to avoid reverse polarity or signal damage.
- Mount the FC in a vibration-isolated area for optimal IMU performance.
5. Environmental Conditions
Table 5-1. Environmental Ratings
| Operating Temperature Range | -20 °C ~ +80 °C |
| Storage Temperature Range | -40 °C ~ +90 °C |
| Humidity Range | 5 % ~ 95 % (non-condensing) |
6. Precautions
- Do not exceed 30 V (6S LiPo) maximum input voltage.
- Ensure proper power distribution and polarity when connecting servos and ESCs.
- Mount away from sources of vibration and magnetic interference.
- Perform full firmware configuration and gyro calibration before flight.
- Ensure firmware and hardware compatibility when updating Rotorflight versions.
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