MultiWii

Same here, I had several crashes and I gave up on MW ALT HOLD. I couldn't tune it, it might be related to the BARO quality or sensitivity, but I believe that is also connected with the PID algorithm. As I mentioned in the other post, I tried the Cleanflight firmware and it started to work immidetaly...

Leo I am playing with Cleanflight which is an extraction and improved MW firmware. They introduced a new PID algorithm what is called Multiwii PID (renew). ALT Hold work there quite well. It also supports SONAR which help a lot when the Copter is low. I wish that our developers will move forward fas...

Very nice. At what height do you trigger the ALT Hold?
It looks like 6-7 meters. Could you have good ALT HOLD in lower levels such as 3-4 meters ?

David

Leo Yes this is the link I was referring too. And this is why I wondered and asked the questions at the other post http://www.multiwii.com/forum/viewtopic.php?f=8&t=6660 after Mr. happul3 explained more in details how the Baro PID works. I agree with you that what is written in this post https:/...

Thanks for the clarification. Maybe I didn't follow the instructions for your Conf version. The folders content came with version 2.4 has besides of the MultiWiiConf.exe file few more dlls. What I download from your link only has the MultiWiiConf.exe file. Below is the folder content of your release...

Running windows 7 64 bit and couldn't run your version. It open a transparent window and hung.
Anyway here is the screen shoot from my MultiWiiConf came with MW 2.4.

Thanks
David

Leo Until now my understanding was P - means how much copter should relay on the baro sensor. Higher the value is, stronger the copter relays on the Baro reading. I - is used to compensate drift costed by battery voltage drop during the time. Higher the value is faster the copter will react to volta...

Hi all I am not sure how to ask for feature requests so I am opening this topic. I played with several copter controllers and GUI's (Hoverfly, NAZA, OpenPilot and MissionPlanner products. I like to Multiwii code and GUI and I wish that it could be more competitive. Below are some feature Requests I ...

Mr. happul3 The information you provided is new to me since all other documentations I found on the internet describes differently. For example it says that the PID I component compensate for battery voltage drop. Very interesting that the accelerometer is involved with the ALT HOLD. I was so concen...

thanks Leco
Yes I did cover the Baro at all of the experiments I did.
David

Leco, I followed the ALT Hold PID calibration process. While P & I = 0 , play with D until I you Alt Hold for short period. And then play with P until it holds for longer time. The I value as it mention is targeted to compensate for battery drop. It is still a valid process for version 2.4? My p...

Another question I have.
Do you know if the MW team are considering officially adding SONAR support in the next release?
This might help a lot at the lower levels.
David

Leo BTW, regarding your PID settings, after my ROLL/PITCH/YAW tuning I have very close results to yours. I wished I could achieve the same on the ALT HOLD settings. I am going to try to re-seat the board and better dump vibrations. Thanks for your advice about the other forum thread, it is very inte...

Thank you all for the excellent discussion. My understanding from the conversation is that the "deadband" should not be touched (thanks Leco for the explanation). However if one has noisy Baro trying to change the values to 7 at "alt.EstAlt = (alt.EstAlt * 6 + BaroAlt ) >> 3;" mi...

If you pay attention in version 2.3 and 2.4 the following was changed compared to 2.2. if(calibratingB > 0) { logBaroGroundPressureSum = log(baroPressureSum); baroGroundTemperatureScale = ((int32_t)baroTemperature + 27315) * (2 * 29.271267f); // 2 * is included here => no need for * 2 on BaroAlt in ...

Dennis Thanks for sharing. The ALT Hold on Multiwii is broken since a while. I was reviewing previous Multiwii releases and the alt.EstAlt * 7 was always set to 6. Do you want to say that it didn't work also on the older releases? Can you also explain more on what the Deadband is used for and how it...

Leo I almost gave up on Multiwii. I am now switching to MegaPirate NG to see how this will be working. Do you have any experience with MegaPirate NG? I will also try to apply the suggestion from the link http://www.multiwii.com/forum/viewtopic.php?f=8&t=6675 It looks interesting since this typo ...

Got it, thank you

Leo
Do you mean that when I turn on GPS Hold it should also activate the ALT Hold?
If yes, I could also see in the GUI that the ALT Hold is turning on?

I tried the GPS Hold mode and it looks to be much more stable. With ALT Hold only mode it behave crazy,
David

Hi guys! m It's: - take into acount inclinations - doesn't see horizontal accelerations - keeps altitude on the wind (tried with 15-20km/h) - has very good reaction for pushing - has accuracy +/-20..40cm in calm weather according to baro accuracy - has accuracy about +/-1m during the flights... fly...

Thanks for your help Leo
Regarding the GPS Hold. It has the option of GPS take over the Baro.
If I use the GPS Hold it will do the ALT Hold instead of the Baro?
David

What is recommended, should I enable ALTITUDE_RESET_ON_ARM.
I am not using GPS HOLD yet until I will be able to stabilize the ALT HOLD.
Any other Idea why the PID is so sensitive?
David

Hi, I have problems with ALT hold with version 2.4. With Version 2.3 it was working not bad. I hope that someone could help. I am running Crius AIO version 2.0 using MS5611 on Quad copter F450 based. It is very difficult to adjust the ALT HOLD while it is very sensitive. I reset PI and played with D...

Thank you much.
It resolved my issue.

Hi EOSBandi, Can you please help. What is the reason that all of the Navigation settings in MultiWiiWinGUI 2.3> flight tuning are grayed? I also can't upload any mission. I am running Multiwii 2.4 firmware on Crius AIO V2. The GPS functions well and recognize 9 satellites while it is set 38400, it ...

Hi Jason Thank you for sharing the code. Great work. I managed to compile the code base on the instructions you provided. However, later I compared the instructions to the download code you shared and I can see few differences. Can you please help and direct to what is correct? *********************...