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  • Dec 27 2016 20:06

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Why I make px4fmu-v2_default ,it shows error:expected initializer before '_PARAMS' from the
Guys, is there anyone find a method to control the thrust force and torques directly for the drone with PX4?
Vasily Evseenko
Hi, could someone review and apply PX4/Devguide#723 ?
I have the above problem when using STIL, how can I solve it?
My operating system is not ubuntu, but is deepin which is a derivative system of debian
My screenshot appears after typing the following command:
make px4_sitl jmavsim
If I don't do anything, the program will stop at this line:
INFO  [ecl/EKF] EKF commencing GPS fusion
I used to drive the computer for one night and the program still stops here.
Please help me, thank you, I am a newbie.

So I used a stereo camera, a TX2 on top of Pixhawk to achieve fully autonomous drone flight and collision avoidance.

In case someone is also interested, here is how I have done it:https://github.com/generalized-intelligence/GAAS/tree/master/demo/tutorial_1

Hi, I started working with UAVCAN using px4. I found a function inside esc.cpp called "int res = _uavcan_sub_status.start(StatusCbBinder(this, &UavcanEscController::esc_status_sub_cb));" but this function is never getting executed when I call it from uavcan_main.cpp. Can someone tell me how to access this function?
Hi Guys, New to this site. Im building a PX4 drone all up weight is 4kg with 15x5.5 props. I have chosen the Generic Quadcopter X model and the drone flies however its quite unstable on basic settings. Ive increased MPC_THR_HOVER to a level where the drone is quite good at maintaning altitude on stabilised mode. Its very rocky with default PIDS but increasing them makes it better.
I do have 2 problems though. On take off in ATTITUDE or Position it rises to a height of around 1.5 Meters and climbs or descends a lot on its own. Once I take it up to about 7 meters this stops and it feels like its locking on to ATTITUDE. what could cause this.
The other problem is Landing. In stabilised mode it lands fine But ATTI and POSITION it wont land it wants to rise and will not decrease motor speed. We are hoping to get it to land well as this is a machine that will be used for others to fly hopefully just in position mode. Ive tried Lowering MIN_PWM to 990 this is the lowest the motors do not stop while armed and tilting. Any hekp on these 2 problems would be amazing.
Alexis Paques
This is deprecated; See the slack
Hi, everyone; we are trying to build a C++ application indoor with px4 and uwb; I can push mocap position as vision pose to EKF2 ( through the MavSDK Passthrough ), but when I try to do some offboard control with mavsdk, the telemetry::health() prompts "Home position to be set"; I try to set home position with mavlink_set_home_position_t message, but it doesn't work; Has anyone met this problem before? What should I do to use mavsdk and uwb for auto control indoor? Thanks...
Alex Albert
inertial sense pixhaw??
Alex Albert
do you know any information about connecting this inertial navigation system to pixhawk or do you know a post
Alex Albert
do you have any idea how to connect inertial sense uINS with pixhawk?

When I try to calibrate radio, QGC says, " Detected 0 radio channels. To operate PX4, you need at least 5 channels".
I flash px4 omnibus_f4sd_default to eachine X220s’s flight controller Omnibus F4 V3 flight controller with STM32 F405 MCU.
At the begining all hardware was default.(flysky fs-i6x transmitter and fs-a8s receiver)
then i changed them to taranis x9d-plus and frsky d8 receiver.
i took that radio channel error on qground with both combinations.
but when the firmware was betaflight all combinations were okey.
here is my cable connection on board.
i soldered sbus slot near the "pw" led.


I need help, I downloaded the px4 Firmware, installed ros and ran the commands "make px4_sitl gazebo_iris_opt_flow" and "roslaunch mavros px4.launch fcu_url: =" udp: //: 14540@ 14557 "", however when I run "rostopic list" I don't get a topic image from the camera. Can someone point me to a tutorial on how to activate this?
UAS Nmims
Hi! i wish to run a multi-vehicle simulation on gazebo but i can't seem to figure out how to change the spawn/starting location of Individual UAVs. I have tried using export PX4HOME(LAT/LONG/ALT) , but that just seems to change the starting location of the entire batch of UAVs and I don't know how to adjust their individual positions explicitly.
Hi am trying bulid vtol drone using px4 , so I am not getting framewares only , were can find the frameware,

Hi! I am using mavros_msgs/PositionTarget message (mavros_msgs/PositionTarget Documentation)

Currently the drone is in world frame. But I want to use my drone in body frame i.e as the drone moves the origin should always be the drone’s center. How to achieve this?

Qichang Chen
Hi,I want to know can sbus_init() function use serial port connect to fmu?
I want to add a moudle on fmu to output and input sbus signal
Hi, I just recently set up the whole PX 4 Firmware in My Ubuntu 20.04
Hi, I just recently set up the whole PX 4 Firmware in My Ubuntu 20.04. But I am wanting to customize the Iris Drone, so was trying to file its Xacro File. But my Firmware folder doesn't have the rotors_description file under which the URDF Folder is present. Can you tell why my Firmware folder is not having any Xacro files and it's still able to launch the simulation.
And if the location has been changed then can someone guide me out on this