APM Yaw Center Stick Dead Zone Adjustment?

[midnightdaylight]

For Pilots who have APM experience.
You guys have found some good answers for me in the past, so here I am again.
It seems that the first few millimeters of travel on the yaw stick have no effect when flying. I would like to remove as much of the dead zone as I can because it rely throws me off.

Mission planner sees all stick movements on the slider bar, so there is nothing for me to adjust on my Tx.

Thanks for any help

 

[makattack]

Uhm, what kind of an multirotor? What are your specs? What are your rate PID settings? How did you arrive at those? What flight mode? So many questions... but we can't help without those answers...

 

[AverageGuyRC]

Also what type of transmitter? Does your transmitter allow you to calibrate the sticks?

 

[midnightdaylight]

I'm nearly certain it's not Tx related, due to not having this issue on any of my other quads/FCs, and the fact that the slider in mission planner show both the stick being centered, and ever precise movement left and right.
but for what it's worth, I have a stock 9x

 

[midnightdaylight]

I'm assuming you have AMP experience?
I'm inclined to believe a dead 5%~ center stick dead zone would have little to do with the build...
But just incase you know something I don't here it is.

HK Pilot 2.7 (APM clone) master set
Alien X frame (550mm spider quad)
2212 960kv, 25amp Qbrain 9" props

Yaw PIDs are Default
Roll and Pitch where auto tuned at P 0.180 / I 0.180 / D 0.012

The quad is locked in and stable, it flies great. the Yaw moments are good as well, there is just that first 5%~ left and right that have no effect.

 

[makattack]

Yep, those stock/default pids are for essentially a very soft and easy to fly 450 sized quad like the 3dr iris. Yours is a little bigger, with a similar motor and prop combo, but the bigger size gives me a gut feeling that you need to greatly increase the yaw p gain. I believe the 9x has a pot you can assign to a channel. Well if you assign it to channel 6, and use mission planner to assign that to rate yaw p, then set the limits (min, max), you can try 180-400 for example to try .18 through to. 4 just me guessing on the max. Pick a number you're comfortable with. The limits are divided by 100 to get the decimal value.

Once you do that, the pot in its lowest setting gives .18 (your default) and highest setting gives .4 in my example.

Slowly turn the pot from the lowest setting and try yawing to see if it improves.

This is why we needed more information to help you. Also, if you have expo in the 9x programmed, it should be removed.

 

[midnightdaylight]

Yaw PIDs are good, I found the info I was looking for. Turns out the Yaw channel on APMs dose not effect the craft until a value of 1000+- is reached. very bad for acro flight grrrr.

Apparently it has been something APM pilots have be complaining about for a long time.

Sadly there is no way to adjust the yaw's "Deadzone" outside of editing, compiling, and re-flashing the FW...

 

[makattack]

Are you sure you can't adjust deadzone? I'm not 100% sure as my APM on a trifecta tricopter (3.2.1) with much lowered PID's (because it's a mini tricopter) don't show any of your characteristic. I'm using a PPM RX and a taranis x9d+ TX. Anyway, these parameters might play a hand, but as I said, I haven't had a need to mess with these deadzone variables:

http://copter.ardupilot.com/wiki/configuration/arducopter-parameters/#rc_dead-zone_rc4_dz

 

[notreallyme]

can you put a"reverse" expo in the radio to help the center stick dead zone?

More like the purple line instead of a "normal" expo like the blue