Test simultaneously different pwm values

1

Hi everyone !

I would like to test simultaneously different pwm values on two distinct channels. The NSH command ‘pwm test’ does not allow me to send different pwm signal on different channels:
https://pixhawk.org/firmware/apps/pwm

I would like for example to send 1200 us on channel 1 and 1500 us on channel 2.

Is there an easy way to do that ? (I’m using the Pixhawk mini and use the NSH console from MissionPlanner)

Cheers,

Romain

2

You could background the first and immediately call the second.

pwm test -c 1 -p 1200 &
pwm test -c 2 -p 1500

If this isn’t sufficient I’d recommend doing it higher level (setup a mixer and send the commands over mavlink).

3

Cool, exactly what I was looking for ! :slight_smile:

4

Hi,

So now it works fine but i would like to know if it is possible to kill those background ‘pwm test’ process. The ‘kill -9 340’ (where 340 is my pid value from a call to ‘ps’) does not seems to work.

Is is possible to bring a background process to foreground ? or to simply kill it ?

Because now I need to restart the Pixhawk every time to try another set of pwm values…

Thanks,

Romain

5

I’m not sure, but if you need something more advanced personally I’d start thinking about writing code to do it either over mavlink or in a new app. You could also look at the motor_ramp test command. https://dev.px4.io/en/middleware/modules_command.html#motorramp