AP_Periph CAN Node L431
Compact, versatile, and built for the DroneCAN ecosystem, the AP_Periph CAN Node L431 acts as a smart peripheral adapter—supporting UAVCAN v1, multiple I/O options, and seamless integration with ArduPilot systems. It’s not just an adapter—it’s a game-changer for modern UAV builds.
AP_Periph CAN Node L431 - an adapter that changes the rules of the game!
The AP_Periph CAN Node L431 is a UAVCAN v1-compatible peripheral based on the STM32L431 MCU. It supports up to 5 PWM outputs, RC input, voltage and current sensing, and integrates seamlessly with ArduPilot as a DroneCAN node. Designed for reliable, low-latency communication over the CAN bus in UAV systems.
- CAN-L431 is an Adapter Node based on ArudPilot AP_Periph firmware.
- With this board, you can easily utilize the ArduPilot driver library to convert ArduPilot supported GNSS, Compass, Barometer,Airspeed sensor, and GPIO based (PWM, Buzzer/LED notify) peripherals to DroneCAN bus peripherals.
Specification of AP_Periph CAN Node L431
- MCU: STM32L431xC, 256KB Flash
- CAN transceiver data rates up to 1 Mbit/s
- 1x CAN, DroneCAN Protocol (2x GH-4P connectors in parallel)
- 3x UARTs
- UART1, spare
- UART2, MSP default, DFU
- UART3, GPS default
- 1x I2C
- for peripheral Airspeed sensor
- for peripheral Barometer
- for peripheral Compass QMC5883L
- 1x SPI
- for peripheral RM3100
- 4x ADC
- BATT_VOLT, PIN 5
- BATT_CURR, PIN 6
- BATT2_VOLT, PIN 15
- BATT2_CURR, PIN 16
- 5x PWM outputs
- 1x GPIO with TIM16 for buzzer
- ST debug, SWCLK & SWDIO
- LED
- Blue, Fast blinking, Booting
- Blue, Slow blinking, working
- Red, 3.3V indicator
- Input voltage range: 4.5~5.5V @5V pad/pin
- Power consumption: 40mA
- Operating Temperatures: -20~80 °C
- Physical
- 2x JST-GH-4P(SM04B-GHS-TB) for CAN
- 1x JST-GH-4P(SM04B-GHS-TB) for I2C
- 1x JST-GH-6P(SM06B-GHS-TB) for UART3+I2C
- Board Size: 26mm*26mm*6mm. 3.7g
- 3D file from MatekSYS : CAN-L431_STEP.zip
- Firmware
- ArduPilot AP_Periph MatekL431-Periph, or MatekL431-Airspeed
- Update via DroneCAN GUI Tool
Parameters of AP_Periph CAN Node L431
SLCan Mode CAN1 > Parameters | Parameters | |||
UART | TX1 RX1 | UART1 | Serial PORT 0 | USER |
UART | TX2 RX2 | UART2 | Serial PORT 1 | MSP_PORT 1 |
UART | TX3 RX3 | UART3 | Serial PORT 2 | GPS_PORT 2 |
I2C | SCL/SDA GH connector | PB13/PB14 | Baro SPL06 | Address 0x76 |
I2C | QMC5883L | Default parameters | ||
I2C | MS4525 MS5525 DLVR-L10D | ARSP_TYPE 1 ARSP_TYPE 3 ARSP_TYPE 9 | ||
SPI1 | SCK, SO, S1, CS1 | RM3100 | - | |
ADC | Vbat pad | PA0 | 0~69V 1K:20K divider builtin | BATT_MONITOR 4 BATT_VOLT_PIN 5 BATT_VOLT_MULT 21 |
ADC | Curr pad | PA1 | 0~3.3V | BATT_CURR_PIN 6 |
ADC | VB2 | PB0 | 0~3.3V | BATT_MONITOR 4 BATT2_VOLT_PIN 15 |
ADC | Curr2 | PB1 | 0~3.3V | BATT2_CURR_PIN 16 |
PWM | 1 | PA8 | TIM1_CH1 | OUT1 |
PWM | 2 | PA9 | TIM1_CH2 | OUT2 |
PWM | 3 | PA10 | TIM1_CH3 | OUT3 |
PWM | 4 | PA11 | TIM1_CH4 | OUT4 |
PWM | 5 | PA15 | TIM2_CH1 | OUT5 2812 LED OUT5_FUNCTION 120 NTF_LED_TYPES 257 |
Additional Data
Buzzer | Bz- | Passive buzzer – |
Buzzer | 5V | Passive buzzer + |
Disable GPS | GPS_TYPE 0 GPS_PORT -1 |
Disable compass | COMPASS_ENABLE 0 |
Disable Battery monitor | BATT_MONITOR 0 BATT2_MONITOR 0 |
Disable MSP | MSP_PORT -1 |
Parameters in Flight controller
- CAN_D1_PROTOCOL = 1
- CAN_P1_DRIVER = 1
- GPS_TYPE = 9 DroneCAN
- COMPASS_TYPEMASK DroneCAN (Unchecked)
- ARSPD_TYPE = 8 (DroneCAN)
- NTF_LED_TYPE -> DroneCAN (Checked)
Tips
- MatekL431-Periph firmware support I2C compass QMC5883L by default
- If you connect other I2C compass to this board, you need to update it with this firmware via DroneCAN GUI or SLCAN mode in Mission Planner.
What's included in the AP_Periph CAN Node L431
- 1x CAN-L431 board
- 1x JST-GH-4P to JST-GH-4P 20cm silicon wire
- 1x JST-GH-6P to JST-GH-6P 20cm silicon wire