"Once again on this topic.
I don't really understand why can't APM have Z axis autotune. Well, maybe it have no resource for kalmann filter, but some simple features and some minor improvements could be done."

"Thanks Randy,
I've seen this page, but I'll take closer look at it once more."

"Do anyone know if I can use solid state relays on my PX4IO board and how should I setup em (map to specific RC channel) if answer is positive.
Is it possible to turn em on say on "arm" action?"

"I guess there is limitation on PX4FLOW focus. Did you set up sensor focus as it is said in Wiki? I got mine adjusted to 3m distance, and it was NOT set up correctly out of the box (as it is also said in wiki).
I am currently using:
PX4 + IO(stack) +…"

"Don't get too comfortable, cell operator will always know where your drone is :D 
Big Brother won't let this be :D :D :D"

"You can not resolve all problems with GPS just with desire and attitude. 
I know several ppl who lost their Phantoms due to fly-aways. Nobody's got perfect software.
If you need good positioning, you have to diversificate sensors. Maybe add GSM…"

"It is pleasure to meet you.
If you will need extra information or tests made, feel free to contact me. I will be glad to help."

"I am sorry if that sound offensive, please accept my apologizes.  I just meant that there are several themes on topic of AltHold and loiter in 3.2.1 firmware.
This one topic here that I participated and there are several with same subject. 
In my…"

"Ok, it's dire offtopic, but:

On 3.2.1 firmware there persists AltHold problem. If you browse ArduCopter 3 thread by keyword "loiter" and "althold" you'll get pretty good understanding of problem. 

I want ArduCopter on PX4 hardware, plus I want to…"

"Maybe project should define one milestone, that will have limited (not expandable) set of features, that will be debugged and _well documented_.

I mean, assembling copter and flashing firmware IS fun, but I guess a lot of people want to fly after…"

"In my case I had brownout because of APM power module. As funny as it sound it just had not enough power. 7.5A BEC resolved problem."

"I guess I need dev's help after all. I found 'mkblctrl' in code here and I found mkblctrl driver, but I can't really figure out at which moment driver loads config from file and what options are needed. "

"Ok. digging process on MK-BL ESCs goes on.
For now there is new information: 
1. To enable autorun of mkblctrl driver on arduCopter you have to create file /etc/APM/mkblctrl with correct motor numbering.
Does anybody know what "correct motor…"

"http://diydrones.com/profiles/blogs/mikrokopter-bl-ctrl-i2c-esc-sup... agree that UAVCAN is better, but my ESCs have only i2c and it would be too generous of me to throw em off.
Thanks. Kso... I guess I have to somehow put it on i2c bus.
Debug is…"

"Shoot, it really hurts to find your post with question in web search results while searching for solution :)"