# PX4 Autopilot **URL:** https://discuss.px4.io/c/px4/25.md?page=1 [Latest](https://discuss.px4.io/latest.md) · [Categories](https://discuss.px4.io/categories.md) **Page:** 2 --- ## [MicoAir743v2-AIO: ExpressLRS/CRSF won't lock on RX6 under PX4 (SBUS inverter contention on the RC pad)](https://discuss.px4.io/t/micoair743v2-aio-expresslrs-crsf-wont-lock-on-rx6-under-px4-sbus-inverter-contention-on-the-rc-pad/49355)
**Author:** [@Peter\_Burke](https://discuss.px4.io/u/Peter_Burke)\ **Replies:** 0\ **Last updated:** [August 12, 2026, 1:11am UTC](https://discuss.px4.io/t/micoair743v2-aio-expresslrs-crsf-wont-lock-on-rx6-under-px4-sbus-inverter-contention-on-the-rc-pad/49355 "2026-08-12T01:11:26Z")
TL;DR — if your ExpressLRS receiver won’t lock on a MicoAir743v2-AIO under PX4, move it off the RC pads. The RX6 pin has an SBUS inverter permanently wired to it, and a CRSF receiver can’t share that line. Any other UART… --- ## [Flasboarding updated firmwar without recalibration](https://discuss.px4.io/t/flasboarding-updated-firmwar-without-recalibration/49353)
**Author:** [@Talon](https://discuss.px4.io/u/Talon)\ **Replies:** 1\ **Last updated:** [August 14, 2026, 6:04am UTC](https://discuss.px4.io/t/flasboarding-updated-firmwar-without-recalibration/49353 "2026-08-14T06:04:05Z")
Hello , i have updated my custom firmwar and i want to flasboard it to my pixhawk6x FC without the need the remake all the calibration ( sensors , radio …) since it is the same aircraft/airframe. It is possible with qg… --- ## [PID tuning Large drone](https://discuss.px4.io/t/pid-tuning-large-drone/49346)
**Author:** [@Hiran\_Bandarigoda](https://discuss.px4.io/u/Hiran_Bandarigoda)\ **Replies:** 10\ **Last updated:** [August 14, 2026, 9:22am UTC](https://discuss.px4.io/t/pid-tuning-large-drone/49346 "2026-08-14T09:22:51Z")
Hi, I was tuning the Rate controllers of my large drone today. First log: https://review.px4.io/plot\_app?log=2d535d24-7193-4373-b26e-062a9818eb08 Second log: http://localhost:5006/plot\_app?plots=pid\_analysis&log=1c7cb2… --- ## [Does motor inductance value affect PX4 DShot commutation noise and log vibration reading?](https://discuss.px4.io/t/does-motor-inductance-value-affect-px4-dshot-commutation-noise-and-log-vibration-reading/49342)
**Author:** [@X-TEAM](https://discuss.px4.io/u/X-TEAM)\ **Replies:** 0\ **Last updated:** [August 10, 2026, 12:20am UTC](https://discuss.px4.io/t/does-motor-inductance-value-affect-px4-dshot-commutation-noise-and-log-vibration-reading/49342 "2026-08-10T00:20:34Z")
Hi everyone, I am a hardware engineer working on multirotor BLDC motor design. Recently we are comparing motors with different winding inductance for heavy‑lift multirotor platforms. During bench testing, we noticed th… --- ## [PX4 on FW aircraft without ailerons](https://discuss.px4.io/t/px4-on-fw-aircraft-without-ailerons/49341)
**Author:** [@j3kestrel](https://discuss.px4.io/u/j3kestrel)\ **Replies:** 3\ **Last updated:** [August 17, 2026, 7:59pm UTC](https://discuss.px4.io/t/px4-on-fw-aircraft-without-ailerons/49341 "2026-08-17T19:59:14Z")
I am configuring PX4 for a V-tailed fixed-wing aircraft without ailerons. I have not succeeded at finding any online guidance for this. It is also noteworthy that QGC 5.08 and 5.10 are not showing an actuators/mixer/al… --- ## [Uavcan\_node: distance\_sensor publisher orientation parameter](https://discuss.px4.io/t/uavcan-node-distance-sensor-publisher-orientation-parameter/49331)
**Author:** [@samhsieh251](https://discuss.px4.io/u/samhsieh251)\ **Replies:** 0\ **Last updated:** [August 7, 2026, 9:40am UTC](https://discuss.px4.io/t/uavcan-node-distance-sensor-publisher-orientation-parameter/49331 "2026-08-07T09:40:42Z")
Hi ! "Recently, we encountered an issue where the distance\_sensor orientation does not match the PX4 configuration.On the UAVCAN node (ToF module) side, I ran the listener distance\_sensor command in the MAVLink console … --- ## [Gazebo Simulator](https://discuss.px4.io/t/gazebo-simulator/49314)
**Author:** [@el\_brunestor](https://discuss.px4.io/u/el_brunestor)\ **Replies:** 2\ **Last updated:** [August 6, 2026, 2:10pm UTC](https://discuss.px4.io/t/gazebo-simulator/49314 "2026-08-06T14:10:16Z")
Hi everyone, I’m new at this so I hope I’m not making a topic mistake. Yesterday after the long long installation of the PX4 software and the QGC I tried to do my first simulation to see the drone in action in the Gazebo… --- ## [Enabling the CAN BUS causes the system to crash](https://discuss.px4.io/t/enabling-the-can-bus-causes-the-system-to-crash/49313)
**Author:** [@ozturk](https://discuss.px4.io/u/ozturk)\ **Replies:** 2\ **Last updated:** [August 8, 2026, 9:02am UTC](https://discuss.px4.io/t/enabling-the-can-bus-causes-the-system-to-crash/49313 "2026-08-08T09:02:33Z")
Hello everyone, I’m porting a PX4 to a flight controller board I designed myself. The system works fine until I activate the CAN BUS. After adding the following statements to my default.px4board file: CONFIG\_DRIVERS\_UA… --- ## [Thrust consistency difference between cold and hot motors](https://discuss.px4.io/t/thrust-consistency-difference-between-cold-and-hot-motors/49297)
**Author:** [@X-TEAM](https://discuss.px4.io/u/X-TEAM)\ **Replies:** 2\ **Last updated:** [August 1, 2026, 8:32am UTC](https://discuss.px4.io/t/thrust-consistency-difference-between-cold-and-hot-motors/49297 "2026-08-01T08:32:59Z")
I’ve noticed a small thrust drop after long‑time flight.Does the rising motor temperature change the actual KV value and affect PX4 altitude hold?Is there any tuning trick to reduce this drift?Thanks for sharing your exp… --- ## [Quadrotor Three-Motor Emergency Landing: A PX4 Degraded-Landing Experiment](https://discuss.px4.io/t/quadrotor-three-motor-emergency-landing-a-px4-degraded-landing-experiment/49295)
**Author:** [@gfLv\_amov](https://discuss.px4.io/u/gfLv_amov)\ **Replies:** 1\ **Last updated:** [August 3, 2026, 4:43pm UTC](https://discuss.px4.io/t/quadrotor-three-motor-emergency-landing-a-px4-degraded-landing-experiment/49295 "2026-08-03T16:43:38Z")
Important notice This is an exploratory PX4 jMAVSim SITL experiment, not a fault-tolerant flight-control solution ready for real hardware. “Protection” here means that, after one motor stops, the system attempts a de… --- ## [PX4 Python Simulator](https://discuss.px4.io/t/px4-python-simulator/49292)
**Author:** [@cmb87](https://discuss.px4.io/u/cmb87)\ **Replies:** 3\ **Last updated:** [August 3, 2026, 1:40am UTC](https://discuss.px4.io/t/px4-python-simulator/49292 "2026-08-03T01:40:07Z")
Dear Community, I’d like to share my Python based PX4 simulator with you. It uses the mavlink interface and was heavily inspired by JMavSim. So far Iris as well as a X8 fw wing model is supported. Also another racing qu… --- ## [PX4 support for STM32N6?](https://discuss.px4.io/t/px4-support-for-stm32n6/49286)
**Author:** [@broccolee](https://discuss.px4.io/u/broccolee)\ **Replies:** 3\ **Last updated:** [August 4, 2026, 10:13am UTC](https://discuss.px4.io/t/px4-support-for-stm32n6/49286 "2026-08-04T10:13:15Z")
Hi, Just curios to know if there has been any development by the PX4 community to support the STM32N6 processor? Or does anybody have any experience with that so far? Thanks. --- ## [DVL integration for underwater UUV px4 for underwater autonomous flight](https://discuss.px4.io/t/dvl-integration-for-underwater-uuv-px4-for-underwater-autonomous-flight/49284)
**Author:** [@gengatharan](https://discuss.px4.io/u/gengatharan)\ **Replies:** 1\ **Last updated:** [July 31, 2026, 8:30am UTC](https://discuss.px4.io/t/dvl-integration-for-underwater-uuv-px4-for-underwater-autonomous-flight/49284 "2026-07-31T08:30:47Z")
Hi, I am working on underwater/aerial (amphibious) drone for surveillance purpose, since it is in underwater, i cant use GNSS for navigation, so in underwater its is fully GNSS denied navigation. So i am planning to us… --- ## [How to mitigate the "Flight Termination Failsafe" that activates when the "EKF2" diverges due to the flight simulation engine lagging which causes the CPU load to spike up and causes the aircraft to crash?](https://discuss.px4.io/t/how-to-mitigate-the-flight-termination-failsafe-that-activates-when-the-ekf2-diverges-due-to-the-flight-simulation-engine-lagging-which-causes-the-cpu-load-to-spike-up-and-causes-the-aircraft-to-crash/49262)
**Author:** [@Aditya\_Karnam1](https://discuss.px4.io/u/Aditya_Karnam1)\ **Replies:** 0\ **Last updated:** [July 26, 2026, 11:47am UTC](https://discuss.px4.io/t/how-to-mitigate-the-flight-termination-failsafe-that-activates-when-the-ekf2-diverges-due-to-the-flight-simulation-engine-lagging-which-causes-the-cpu-load-to-spike-up-and-causes-the-aircraft-to-crash/49262 "2026-07-26T11:47:21Z")
Hi PX4 community, I am an aspiring flight controls engineer who loves to contribute to the aerospace domain. I am currently running “PX4-SITL” simulations using “Alireza Ghaderi’s” PX4-XPlane plugin (latest release ver… --- ## [Speed Controller Parameter Tuning](https://discuss.px4.io/t/speed-controller-parameter-tuning/49253)
**Author:** [@juyu](https://discuss.px4.io/u/juyu)\ **Replies:** 2\ **Last updated:** [July 27, 2026, 1:45am UTC](https://discuss.px4.io/t/speed-controller-parameter-tuning/49253 "2026-07-27T01:45:15Z")
I’ve recently been working on PID tuning. The flight performance shown in the attached screenshot is the result after my velocity loop PID parameter adjustment. Could you help evaluate if any parameters still need furthe… --- ## [Does littleFS do bad block management for SPI NAND Flash memory device?](https://discuss.px4.io/t/does-littlefs-do-bad-block-management-for-spi-nand-flash-memory-device/49250)
**Author:** [@broccolee](https://discuss.px4.io/u/broccolee)\ **Replies:** 2\ **Last updated:** [July 30, 2026, 6:24pm UTC](https://discuss.px4.io/t/does-littlefs-do-bad-block-management-for-spi-nand-flash-memory-device/49250 "2026-07-30T18:24:55Z")
Hi, We have a custom board and we are trying to add support for an external SPI NAND FLASH part - MX35LF1GE4AB. We are using the Holybro Kakuteh7v2 project as reference, particularly this commit that has support for the… --- ## [Setpoint jumped to origin in LAND](https://discuss.px4.io/t/setpoint-jumped-to-origin-in-land/49249)
**Author:** [@Hiran\_Bandarigoda](https://discuss.px4.io/u/Hiran_Bandarigoda)\ **Replies:** 0\ **Last updated:** [July 23, 2026, 5:31pm UTC](https://discuss.px4.io/t/setpoint-jumped-to-origin-in-land/49249 "2026-07-23T17:31:31Z")
Today we had some severe problem. We are using ‘CUAV Pixhawk V6X V2’ flight controller. We had the our drone tested for the past week and had no issue but today when switched to LAND mode, it suddenly came down crashing … --- ## [Sharing PX4-FlightAxis-Bridge — RealFlight Evolution as a PX4 simulator](https://discuss.px4.io/t/sharing-px4-flightaxis-bridge-realflight-evolution-as-a-px4-simulator/49248)
**Author:** [@evandas11](https://discuss.px4.io/u/evandas11)\ **Replies:** 4\ **Last updated:** [September 9, 2026, 6:57pm UTC](https://discuss.px4.io/t/sharing-px4-flightaxis-bridge-realflight-evolution-as-a-px4-simulator/49248 "2026-09-09T18:57:47Z")
Hi everyone, I’d like to share an open-source project I’ve been working on that might interest anyone doing SITL/HITL work: PX4-FlightAxis-Bridge, which connects PX4 Autopilot to RealFlight Evolution over the FlightAx… --- ## [Pixhawk Not getting RTK](https://discuss.px4.io/t/pixhawk-not-getting-rtk/49245)
**Author:** [@Maskpro](https://discuss.px4.io/u/Maskpro)\ **Replies:** 1\ **Last updated:** [August 6, 2026, 2:57am UTC](https://discuss.px4.io/t/pixhawk-not-getting-rtk/49245 "2026-08-06T02:57:46Z")
I have a pixkawk Radiolink - I cannot get the RTK working .Can someone please give me some tips to try . I verified the gps on Skystars h7HD and it works fine - basically there make be something I am missing to get the … --- ## ["fs\_mount.c" not behaving properly to NuttX "defconfig"](https://discuss.px4.io/t/fs-mount-c-not-behaving-properly-to-nuttx-defconfig/49238)
**Author:** [@broccolee](https://discuss.px4.io/u/broccolee)\ **Replies:** 0\ **Last updated:** [July 20, 2026, 3:45pm UTC](https://discuss.px4.io/t/fs-mount-c-not-behaving-properly-to-nuttx-defconfig/49238 "2026-07-20T15:45:38Z")
Hi, We have a custom board and we are trying to add support for an external SPI NAND FLASH part - MX35LF1GE4AB. We are using the Holybro Kakuteh7v2 project as reference, particularly this commit that has support for the… --- ## [What kind of results can be achieved with an EKF2 replay？](https://discuss.px4.io/t/what-kind-of-results-can-be-achieved-with-an-ekf2-replay/49235)
**Author:** [@xx\_li](https://discuss.px4.io/u/xx_li)\ **Replies:** 0\ **Last updated:** [July 20, 2026, 2:30am UTC](https://discuss.px4.io/t/what-kind-of-results-can-be-achieved-with-an-ekf2-replay/49235 "2026-07-20T02:30:21Z")
Hi, I’d like to ask what kind of results can be achieved with an EKF2 replay. Does the replay produce a curve that matches the original log? I’ve been working on an EKF2 replay recently and have found that no matter wha… --- ## [Contributing atxxxx analog OSD support](https://discuss.px4.io/t/contributing-atxxxx-analog-osd-support/49231)
**Author:** [@xznhj8129](https://discuss.px4.io/u/xznhj8129)\ **Replies:** 0\ **Last updated:** [July 17, 2026, 9:05pm UTC](https://discuss.px4.io/t/contributing-atxxxx-analog-osd-support/49231 "2026-07-17T21:05:15Z")
Hello everyone, I am new to PX4 development but a part time contributor to other firmwares; in my learning of PX4 and applying PX4 to FPV-style architectures i saw that the built-in atxxxx driver had barely anything in … --- ## [How to tune cascaded PID gains for a custom PX4 SITL drone?](https://discuss.px4.io/t/how-to-tune-cascaded-pid-gains-for-a-custom-px4-sitl-drone/49229)
**Author:** [@flyingpafnouti](https://discuss.px4.io/u/flyingpafnouti)\ **Replies:** 1\ **Last updated:** [July 19, 2026, 3:18am UTC](https://discuss.px4.io/t/how-to-tune-cascaded-pid-gains-for-a-custom-px4-sitl-drone/49229 "2026-07-19T03:18:25Z")
I created a URDF for my 3" FPV drone for PX4 SITL and I’m trying to tune the cascaded PID gains. What’s the recommended approach? I tried the autotune, but it fails every time, even on the default gz\_x500 model in PX4 SI… --- ## [cuVSLAM as a medium for Visual Inertial Odometry (VIO)(](https://discuss.px4.io/t/cuvslam-as-a-medium-for-visual-inertial-odometry-vio/49220)
**Author:** [@CursedRock17](https://discuss.px4.io/u/CursedRock17)\ **Replies:** 3\ **Last updated:** [July 20, 2026, 3:16pm UTC](https://discuss.px4.io/t/cuvslam-as-a-medium-for-visual-inertial-odometry-vio/49220 "2026-07-20T15:16:27Z")
Good Afternoon Folks, I was wondering if anybody on the forum had any experience using cuVSLAM as a library for Visual Inertial Odometry (VIO)? My current lab team is attempting to go this route for position estimation … --- ## [MicroXRCEAgent isn't transmitting ROS2 topics](https://discuss.px4.io/t/microxrceagent-isnt-transmitting-ros2-topics/49219)
**Author:** [@WIDEROZ](https://discuss.px4.io/u/WIDEROZ)\ **Replies:** 8\ **Last updated:** [July 15, 2026, 5:44pm UTC](https://discuss.px4.io/t/microxrceagent-isnt-transmitting-ros2-topics/49219 "2026-07-15T17:44:12Z")
Hello everyone! I want to connect PX4 with a Raspberry to get ROS2 topics, to do so, i’ve followed all the instructions of the documentation : Raspberry Pi Companion with Pixhawk | PX4 Guide (v1.17) My issue is that th… --- ## [Wrong Altitude during Flying below 5m](https://discuss.px4.io/t/wrong-altitude-during-flying-below-5m/49213)
**Author:** [@bermuda\_pilot](https://discuss.px4.io/u/bermuda_pilot)\ **Replies:** 6\ **Last updated:** [September 30, 2026, 12:47pm UTC](https://discuss.px4.io/t/wrong-altitude-during-flying-below-5m/49213 "2026-09-30T12:47:40Z")
Hi everyone, I observed an altitude estimation issue during a recent flight and wanted to know if this is expected or if I should investigate something specific. Setup: PX4: v1.15.0 QGroundControl: v4.4.4 GPS: Holybr… --- ## [Discussion: A Layered Architecture for UAV Autonomy Beyond Basic Flight Control](https://discuss.px4.io/t/discussion-a-layered-architecture-for-uav-autonomy-beyond-basic-flight-control/49205)
**Author:** [@amov\_lab](https://discuss.px4.io/u/amov_lab)\ **Replies:** 4\ **Last updated:** [August 24, 2026, 3:54am UTC](https://discuss.px4.io/t/discussion-a-layered-architecture-for-uav-autonomy-beyond-basic-flight-control/49205 "2026-08-24T03:54:15Z")
Hi everyone, I would like to share some practical thoughts from a recent UAV autonomy integration project and discuss a broader architectural question with the PX4 community: How should we structure the relationship be… --- ## [FlightMD: Free, Open-Source Diagnostic Tool for PX4/ArduPilot/MAVLink flight logs](https://discuss.px4.io/t/flightmd-free-open-source-diagnostic-tool-for-px4-ardupilot-mavlink-flight-logs/49202)
**Author:** [@Praddyx15](https://discuss.px4.io/u/Praddyx15)\ **Replies:** 1\ **Last updated:** [September 13, 2026, 7:07am UTC](https://discuss.px4.io/t/flightmd-free-open-source-diagnostic-tool-for-px4-ardupilot-mavlink-flight-logs/49202 "2026-09-13T07:07:57Z")
Hi all, I’ve been building FlightMD, a free and open-source diagnostic tool for PX4/ArduPilot/MAVLink flight logs. Upload a .ulg/.bin/.tlog and it runs 8 deterministic rule-based checks, oscillation, vibration, EKF, batt… --- ## [In HITL getting Vertical velocity unstable and High Accelerometer Bias error](https://discuss.px4.io/t/in-hitl-getting-vertical-velocity-unstable-and-high-accelerometer-bias-error/49200)
**Author:** [@sayan](https://discuss.px4.io/u/sayan)\ **Replies:** 0\ **Last updated:** [July 6, 2026, 2:16pm UTC](https://discuss.px4.io/t/in-hitl-getting-vertical-velocity-unstable-and-high-accelerometer-bias-error/49200 "2026-07-06T14:16:02Z")
Hi, I am running HITL with PX4 v1.16.2 and I am getting vertical velocity unstable error along with Magnetometer sensor #0 failure warning and High accelerometer bias error. I tried the same plant model with v1.15.4 and… --- ## [Mission-driven gimbal control: PITCHYAW ignored because primary control stays 0/0 — has anyone solved this?](https://discuss.px4.io/t/mission-driven-gimbal-control-pitchyaw-ignored-because-primary-control-stays-0-0-has-anyone-solved-this/49192)
**Author:** [@atifhalim](https://discuss.px4.io/u/atifhalim)\ **Replies:** 0\ **Last updated:** [July 4, 2026, 4:12am UTC](https://discuss.px4.io/t/mission-driven-gimbal-control-pitchyaw-ignored-because-primary-control-stays-0-0-has-anyone-solved-this/49192 "2026-07-04T04:12:10Z")
TL;DR: MAVLink v2 gimbal works perfectly under manual QGC control, but a mission DO\_GIMBAL\_MANAGER\_PITCHYAW never moves the gimbal. Bench testing shows the reason: during the mission, gimbal primary control stays 0/0, so… [Previous page](https://discuss.px4.io/c/px4/25.md) [Next page](https://discuss.px4.io/c/px4/25.md?page=2)