How to Control servo in waypoint autonomously in Fixed wing Aircraft using Pixhawk 4 and QGC

PX4 Autopilot
1

how can i control a servo??

My airframe is standerd fixed wing UAV.

I am using Pixhawk 4 flight controller and Qgroundcontrol.

I want to actuate servo autonomously to drop a payload in a waypoint.

I don’t want to use transmitter switch for servo control.

i am connecting the control surface’s servos to FMU PWM Out of power distribution board and FMU PWM In is connected to I/O PWM Out of Pixhawk4.

Now,

Where should i connect the payload drop servo ??

What parameters should i change in QGC??

what should i do in mission plan??

firmware in my Pixhawk4 is px4.

must I switch to mission planner and ardupilot firmware or it can be in QGC and px4 firmware??

2

Check out this document :wink:

1 Like
3

pd_gripper_en is not available in parameters section.
i think the standard fixed wing airframe does not allows to use griper

4

Which vwrsion pf PX4 are you using? This is only available for unreleased version (it is in beta, but still its considered not as an official release: Release v1.14.0-beta1 · PX4/PX4-Autopilot · GitHub)

5

Have you found a solution for the problem? I am also trying to get the payload drop servo to work. I am using Pixhawk 6c with Holybro X500 v2 frame and QGC v4.3.0. Thanks in advance.

6

Hi, with the latest firmware you can connect the servo to the PWM pins and set the PWM values to the actuator outputs. This link should help:
https://docs.px4.io/main/en/peripherals/gripper_servo.html
Note that you will need to power the servo rails separately (a BEC connected to the main battery supply and PWM pins should work)

This link should help too:
How to Control Servo Motors Using Pixhawk 4 Flight Controller
Or you could use ROS2 to publish to the ActuatorServos topic
https://docs.px4.io/main/en/msg_docs/ActuatorServos.html