Nxt-FC DUAL

All GPIO & function small size PX4 for UAV research for HKUST UAV-Group

ArduPilot and PX4 firmware are supported !

Dimension of Nxt-FC: 27mmx32mmx8mm

Micoair is now producing Nxt-FC: Micoair official website Taobao Ali-Express

UART	TTY	SerialName	Suggest Funcion
USART1	/dev/ttyS0	SERIAL_GPS1
USART2	/dev/ttyS1	SERIAL_GPS2
USART3	/dev/ttyS2	SERIAL_TEL1
UART4	/dev/ttyS3	SERIAL_TEL2
UART5	/dev/ttyS4	SERIAL_RC	Receiver
USART6	/dev/ttyS5	Debug	Currently not available, can be enable
UART7	/dev/ttyS6	SERIAL_TEL3	AUX
UART8	/dev/ttyS7	SERIAL_TEL4	AUX

Getting start

Use precompiled bootloader and firmware

1. Use the firmware files from ./firmware.

2. QGC upgrade is also available.

Compile locally

Follow the PX4 standard approach.

Bootloader:

make hkust_nxt-dual_bootloader

Firmware:

make hkust_nxt-dual

Setting up Nx-FC

PX4 Configuration settings

Power

Set power_source Power Module, then calibrate voltage and current analog data

Receiver

Set RC_PORT_CONFIG with Radio controller

MAVLink

Set MAV_0_CONFIG with TELEM 2

HIGH_RES_IMU and High frequency /imu/data

create file in your tf-card /etc/extras.txt

mavlink stream -d /dev/ttyS3 -s ATTITUDE -r 200

mavlink stream -d /dev/ttyS3 -s HIGHRES_IMU -r 1000

then using the following settings

IMU_GYRO_RATEMAX: 2000Hz

IMU_INTEG_RATE: 400Hz

MAV_0_MODE: External vision

Set Uart4 to 921600

MAV_0_RATE 92160B/s

after these settings you will have 250Hz /imu/data_raw /imu/data

TODO

• 500Hz stable firmware based on PX4 1.14