Hi peeps, I need help please!
I've got a tricopter running APM2.7(HKpilot) and I've having issues with the yaw servo. It's not at all smooth in it's action. It's Savox SH-0257MG digital servo that can run up to 250Hz refresh rate, but from what I understand APM defaults to 50Hz.
From what I read there used to be an option in Advanced Config that allowed you to choose between 50, 150 and 250Hz, but in AC3.1.5 the option doesn't seem to be there.
Is there a way for me to choose 250Hz so my servo works smoothly or is the only option to install a analogue servo? Any help would be much appreciated.
Cheers for reading,
I installed AC3.2 last night which is the same; no MOT_SV_SPEED setting. I've got an analogue servo on the way, but I'd like to get this digi one working well if I can.
No body kow what happened to this option..?
Hi Adrian, cheers for the reply.
I gathered as much from what I've read but there's no definitive info out there. Or at least that I can find.
So the default RC_SPEED setting is 490, which AFAIK means the ESC's are running at 400 as that is the max for the APM. But surely the servo can't be running at that as it would burn it up..? I know the max for my digi servo is 250Hz.
I read something suggesting that output ch7 and ch8 default to 125Hz for the servo, but it could be 50Hz..? It also suggested, as you said, that any other setting than 490 RC_SPEED would change all 8 outputs, over-riding the default on 7&8.
I don't know how the delve in to the code to confirm this, not do I have a 'scope the check it with.
Is there anything definitive on this?
Thanks again bud :)
EDIT: I should say that I'm running a standard tri setup. Outputs 1, 2 & 4 going to ESC's and output 7 to the yaw servo.
ESC on outputs 1,2,4 490hz
Servo on output 7 50hz
That's great buddy, cheers for taking the time :)
So it is actually outputting 490Hz to the ESC's. Hmm, maybe it's just the Pix the limits to 400Hz. Well that's good.
I've since fitted a analogue servo to the yaw and it's much smoother, which makes sense with it being at 50Hz. Looks like digi's are a no-no.