PWM control - Arms but no spin

PX4 Autopilot Flight Controllers 💻
1

Hey All,

I am having a problem where the PX4 (v1) is not outputting a PWM signal when the vehicle is ‘Armed’.
This is using the latest ‘Stable’ PX4 Firmware. ‘Master’ fails miserably at doing anything (crashes mid-boot) on the PX4, so i used the latest ‘Stable’ instead.

Note:

  1. I calibrated the ESCs (Plush 30A) using the QGC calibration.
  2. I set the PWM_MIN to 1400, no effect.
  3. The motors DO flicker every ~1 second while disarmed (I believe it is just to keep the escs ready).
  4. Quadrotor is in ‘+’ formation.

Any help?

If it is relating to the ESCs, how do I solve this problem (is the PWM frequency too high, if so how do i adjust in QGC or by other methods?)?

I would have uploaded the px4log file, but this system would not let me.

Thanks,

2

I tried manual calibration via the reciever. This worked.
However, the quad’s px4 pwm outputs are still not spinning the motors when armed.

Help please?

3

I am quite new to px4 and have little understanding about the whole architecture of px4.
I found similar problem with master build as described in my post.
Motor armed before pushing safety switch and not arming after safety sw on)

When I build the stable branch and uploaded, I could arm and motor spin.
Looks like there is some bug in the master branch maybe?

4

is your transmitter fully charged?

5

You can record the f103 reg status in the log file to find the problem,maybe some wrong between 103 and 427 communication

6

@CaptainJL did you ever get this resolved? I’m having the same issue

7

Does your ESC beep the correct initialization sequence after hooking up to pixhawk?

Some ESC don’t arm unless they first see a PWM under some threshold (see your ESC manual). I guess this is for safety reasons, to prevent props from spinning up immediately at arm. For mine it was 900, try setting PWM_MIN to a lower value in QGC?