Radian

Radian, a Premier flight control system designed for seamless flight performance and full Pixhawk ecosystem compatibility.

General

• The Radian is a premier flight control system designed for seamless compatibility with ArduPilot, PX4 and betaflight.
• Radian is engineered for superior performance and versatility using redundant high quality sensors.
• It is the perfect solution for a broad spectrum of UAV applications, from recreational drones to complex commercial and industrial operations

Main Features

• MCU:

  • STM32H743
  • ARM Cortex-M7 @ 480 MHz
  • 2 MB Flash, 1 MB SRAM

• IMUs:

  • TDK ICM42688P – high-performance, low-noise 6-axis motion sensor
  • Bosch BMI270 – low-power, high-precision 6-axis IMU

• Barometers:

  • Bosch BMP280 (soon upgrading to BMP390) – high-resolution pressure sensor
  • ST LPS22HBTR (soon upgrading to DPS368) – ultra-compact digital output barometer

• Compasses:

  • Bosch BMM150 – low-power 3-axis geomagnetic sensor
  • ST LIS3MDL – high-performance 3-axis magnetometer

• Power Input:

  • Dual redundant power inputs
  • Integrated dual eFuse for enhanced protection
  • Built-in voltage sensing for battery monitoring
  • Onboard DC-DC conversion for stable regulated power delivery

Resources

• 3D CAD Model

Firmware

• The Radian flight controller currently supports the following firmware types:
  • Ardupilot
  • PX4
  • Betaflight
  • INAV
• Currently the hardware definitions are being merged to the public repositories of each codebase.
• Until then, the various versions will be flashed before the units are shipped.
• In case you need the firmware files please contact us.

Mechanical

• The radian flight controller consists of 2 components:

  • FCU - a detachable flight controller unit.
  • Carrier Board - a carrier board for the FCU expanding connectors and power capabilities.

• Weight

  • FCU: 5 [g]
  • Carrier Board: 9 [g]
  • Total Weight: 14 [g]

• Dimensions

  • Board dimensions are defined in millimeters.
  • Mounting hole size is M4, suitable for M3 stacking with silicone dampers.
  • Carrier board: 46 × 38 mm (M4 mounting holes, 30.5 × 30.5 mm spacing).
  • Radian core module: 32 × 32 mm (M2 mounting holes with integrated standoffs).

  

Electrical

General

• For each connector specification, the pinout orientation is determined by an arrow pointing to pin 1.

Specifications

• Input voltage: 8-50.4 [V] (3S-12S)

• GPIO / Communication logic level: 3.3 [V]

  • Warning: do not operate at any other logic voltage level.

• Top View

• Bottom View

Serial Port Mapping

Port Name	Pinout Name	Hardware (UART#)	ArduPilot Serial Name	PX4 Serial Name
USB	USB	USB CDC	SERIAL0	-
TELEM1	TELEM1	UART7	SERIAL1	TELEM 1
TELEM2	TELEM2	UART2	SERIAL2	TELEM 2
GPS	GPS	UART3	SERIAL3	GPS 1

Electrical pinout

• Connector orientation
  • JST-GH cables shall be oriented according to the illustration

FRC Button

• To enter DFU mode, use the FRC button according to the following steps:
  • Power off the board
  • hold the FRC button
  • Power up the board
  • release the FRC button
  • The Radian is now in DFU mode

POWER1

• Connector Definition

  Type	Part Number	Part Name
  Board Connector	SM06B-GHS-TB	JST-GH
  Cable Connector	GHR-06V-S	JST-GH

• Connector Pinout

  Pin	Name
  1	Battery
  2	Battery
  3	Current sense (logic 3.3v)
  4	Voltage sense (logic 3.3v)
  5	GND
  6	GND

POWER2

• Connector Definition

  Type	Part Number	Part Name
  Board Connector	SM06B-GHS-TB	JST-GH
  Cable Connector	GHR-06V-S	JST-GH

• Connector Pinout

  Pin	Name
  1	Battery
  2	Battery
  3	Current sense (logic 3.3v)
  4	Voltage sense (logic 3.3v)
  5	GND
  6	GND

PWR1 VSense - Solder Jumper

PWR2 VSense - Solder Jumper

TELEM1

• Connector Definition

  Type	Part Number	Part Name
  Board Connector	SM06B-GHS-TB	JST-GH
  Cable Connector	GHR-06V-S	JST-GH

• Connector Pinout

  Pin	Name
  1	5V Power Output
  2	UART_TXD (logic 3.3v)
  3	UART_RXD (logic 3.3v)
  4	NC
  5	NC
  6	GND

TELEM2

• Connector Definition

  Type	Part Number	Part Name
  Board Connector	SM06B-GHS-TB	JST-GH
  Cable Connector	GHR-06V-S	JST-GH

• Connector Pinout

  Pin	Name
  1	5V Power Output
  2	UART_TXD (logic 3.3v)
  3	UART_RXD (logic 3.3v)
  4	NC
  5	NC
  6	GND

GPS

• Connector Definition

  Type	Part Number	Part Name
  Board Connector	SM10B-GHS-TBT	JST-GH
  Cable Connector	GHR-10V-S	JST-GH

• Connector Pinout

  Pin	Name
  1	5V Power Output
  2	UART_TXD (logic 3.3v)
  3	UART_RXD (logic 3.3v)
  4	I2C_SCL (logic 3.3v)
  5	I2C_SDA (logic 3.3v)
  6	SAFETY_SW
  7	SAFETY_SW_LED
  8	3.3V_OUT (logic 3.3v)
  9	BUZZER (logic 3.3v)
  10	GND

SERVO (PWM)

• Connector Definition

  Type	Part Number	Part Name
  Board Connector	SM10B-GHS-TBT	JST-GH
  Cable Connector	GHR-10V-S	JST-GH

• Connector Pinout

  Pin	Name
  1	SERVO1
  2	SERVO2
  3	SERVO3
  4	SERVO4
  5	SERVO5
  6	SERVO6
  7	SERVO7
  8	SERVO8
  9	GND
  10	GND

CAN

• Connector Definition

  Type	Part Number	Part Name
  Board Connector	SM04B-GHS-TB	JST-GH
  Cable Connector	GHR-04V-S	JST-GH

• Connector Pinout

  Pin	Name
  1	5V Power Output
  2	CAN_H (logic 3.3v)
  3	CAN_L (logic 3.3v)
  4	GND

USB

• Connector Definition

  Type	Part Number	Part Name
  Board Connector	SM04B-GHS-TB	JST-GH
  Cable Connector	GHR-04V-S	JST-GH

• Connector Pinout

  Pin	Name
  1	5V Power Input
  2	USB_D-
  3	USB_D+
  4	GND

I2C

• Connector Definition

  Type	Part Number	Part Name
  Board Connector	SM04B-GHS-TB	JST-GH
  Cable Connector	GHR-04V-S	JST-GH

• Connector Pinout

  Pin	Name
  1	5V Power Output
  2	I2C_SCL
  3	I2C_SDA
  4	GND

RC

• Connector Definition

  Type	Part Number	Part Name
  Board Connector	SM03B-GHS-TB	JST-GH
  Cable Connector	GHR-03V-S	JST-GH

• Connector Pinout

  Pin	Name
  1	5V Power Output
  2	PPM_IN
  3	GND

Software

Flashing PX4 Firmware

• Please refer to the following guide: https://docs.qgroundcontrol.com/Stable_V4.3/en/qgc-user-guide/setup_view/firmware.html

Flashing PX4 Bootloader

• Step 1: Hold the FRC button and power up the Radian using a USB cable connected to the PC.
• Step 2: Hold the FRC button for additional 3 seconds after power up and release.
• Step 3: Open STM32CubeProgrammer
• Step 4: Choose the USB DFU device and click connect
• Step 4: Flash the module using the instructions in the following link: https://docs.nvidia.com/sdk-manager/install-with-sdkm-jetson/index.html

Troubleshooting

Compass calibration

ArduPilot

• On ArduPilot, with the LIS3MDL compass, calibration can sometimes fail due to an orientation issue.
• To fix this, set the COMPASS_EXTERNAL parameter to 2 (force external) as shown in the image below, then recalibrate.
• Make sure to complete accelerometer and gyro calibration before calibrating the compass.
• Once calibrated and rebooted, the compass will show the updated orientation.