Skip to main content

Radian

Radian, a Premier autopilot designed for seamless performance and full Pixhawk ecosystem compatibility.

radian radian

General​

  • The Radian is a Premier autopilot designed for seamless performance and full Pixhawk ecosystem compatibility.
  • Radian is engineered for superior performance and versatility using redundant high quality sensors.
  • It is the perfect solution for a broad spectrum of unmanned applications.

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 BMP388 – high-resolution pressure sensor
    • Infenion DPS310 – ultra-precise 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​

Firmware​

  • The Radian autopilot currently supports the following firmware types:
  • Currently the hardware definitions are being merged to the public repositories of each codebase.
  • Until then, the various versions will be available here.
  • In case you need the specific versions or configurations please contact us.

Mechanical​

  • The radian autopilot consists of 2 components:

    • FCU - a detachable autopilot 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).

    radian-dimensions

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 radian-top

  • Bottom View radian-bottom

Serial Port Mapping​

Port NamePinout NameHardware (UART#)ArduPilot Serial NamePX4 Serial Name
USBUSBUSB CDCSERIAL0-
TELEM1TELEM1UART7SERIAL1TELEM 1
TELEM2TELEM2UART2SERIAL2TELEM 2
GPSGPSUART3SERIAL3GPS 1

Battery Sense Mapping​

MCU PINDescriptionArduPilot Pin
PC0Battery 1 Voltage SensePIN 10
PC1Battery 1 Current SensePIN 11
PC2Battery 2 Voltage SensePIN 12
PC3Battery 2 Current SensePIN 13

Battery Sense Parameters​

ParameterValue
Voltage Multiplier (When using Onboard sense)19.0
Amps Per VoltIt depends on the external sensor’s parameters

Electrical pinout​

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

FRC Button​

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​

GH-6P

  • Connector Definition

    TypePart NumberPart Name
    Board ConnectorSM06B-GHS-TBJST-GH
    Cable ConnectorGHR-06V-SJST-GH

  • Connector Pinout

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

POWER2​

GH-6P

  • Connector Definition

    TypePart NumberPart Name
    Board ConnectorSM06B-GHS-TBJST-GH
    Cable ConnectorGHR-06V-SJST-GH

  • Connector Pinout

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

PWR1 VSense - Solder Jumper​

PWR1_SOLDER

PWR2 VSense - Solder Jumper​

PWR2_SOLDER

TELEM1​

GH-6P

  • Connector Definition

    TypePart NumberPart Name
    Board ConnectorSM06B-GHS-TBJST-GH
    Cable ConnectorGHR-06V-SJST-GH

  • Connector Pinout

    PinName
    15V Power Output
    2UART_TXD (logic 3.3v)
    3UART_RXD (logic 3.3v)
    4NC
    5NC
    6GND

TELEM2​

GH-6P

  • Connector Definition

    TypePart NumberPart Name
    Board ConnectorSM06B-GHS-TBJST-GH
    Cable ConnectorGHR-06V-SJST-GH

  • Connector Pinout

    PinName
    15V Power Output
    2UART_TXD (logic 3.3v)
    3UART_RXD (logic 3.3v)
    4NC
    5NC
    6GND

GPS​

GH-10P

  • Connector Definition

    TypePart NumberPart Name
    Board ConnectorSM10B-GHS-TBTJST-GH
    Cable ConnectorGHR-10V-SJST-GH

  • Connector Pinout

    PinName
    15V Power Output
    2UART_TXD (logic 3.3v)
    3UART_RXD (logic 3.3v)
    4I2C_SCL (logic 3.3v)
    5I2C_SDA (logic 3.3v)
    6SAFETY_SW
    7SAFETY_SW_LED
    83.3V_OUT (logic 3.3v)
    9BUZZER (logic 3.3v)
    10GND

SERVO (PWM)​

GH-10P

  • Connector Definition

    TypePart NumberPart Name
    Board ConnectorSM10B-GHS-TBTJST-GH
    Cable ConnectorGHR-10V-SJST-GH

  • Connector Pinout

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

CAN​

GH-4P

  • Connector Definition

    TypePart NumberPart Name
    Board ConnectorSM04B-GHS-TBJST-GH
    Cable ConnectorGHR-04V-SJST-GH

  • Connector Pinout

    PinName
    15V Power Output
    2CAN_H (logic 3.3v)
    3CAN_L (logic 3.3v)
    4GND

USB​

GH-4P

  • Connector Definition

    TypePart NumberPart Name
    Board ConnectorSM04B-GHS-TBJST-GH
    Cable ConnectorGHR-04V-SJST-GH

  • Connector Pinout

    PinName
    15V Power Input
    2USB_D-
    3USB_D+
    4GND

I2C​

GH-4P

  • Connector Definition

    TypePart NumberPart Name
    Board ConnectorSM04B-GHS-TBJST-GH
    Cable ConnectorGHR-04V-SJST-GH

  • Connector Pinout

    PinName
    15V Power Output
    2I2C_SCL
    3I2C_SDA
    4GND

RC​

GH-3P

  • Connector Definition

    TypePart NumberPart Name
    Board ConnectorSM03B-GHS-TBJST-GH
    Cable ConnectorGHR-03V-SJST-GH

  • Connector Pinout

    PinName
    15V Power Output
    2PPM_IN
    3GND

Software​

Flashing ArduPilot Firmware​

Flashing PX4 Firmware​

Flashing Betaflight Firmware​

Flashing PX4/Ardupilot/Betaflight 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 5: Select the bootloader file you would like to flash
  • Step 6: Click "Start Programming" and wait for the process to finish
  • Step 7: Power-cycle the board

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. Compass
  • Once calibrated and rebooted, the compass will show the updated orientation. Compass