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Re: [Paparazzi-devel] Rotorcraft Mixing Values for an Octocopter


From: Simon Wilks
Subject: Re: [Paparazzi-devel] Rotorcraft Mixing Values for an Octocopter
Date: Tue, 3 Apr 2012 20:24:45 +0200

Thanks, Felix. I can't comment on the origin of the COEF values though it seemed to basically work on the few short hovers I could do. The short hops were hardly enough to say much though.

I am waiting on new motor controllers to arrive (I am going to try out the Herkules II V4 I2C/PWM boards in place of the MKK controllers) and will continue with the octo adventures.

Regards,

Simon

On Sun, Apr 1, 2012 at 11:48 PM, Felix Ruess <address@hidden> wrote:
Hey guys...

I just wanted to add the octo configuration to the wiki, remembered the image in this thread and noticed that the configuration posted here is definitely not ideal....
How did you come up with these COEF values??

Added a proper version to the wiki: http://paparazzi.enac.fr/wiki/Rotorcraft_Configuration#Supervision

Cheers, Felix

On Thu, Dec 8, 2011 at 3:26 PM, Felix Ruess <address@hidden> wrote:
See http://paparazzi.enac.fr/wiki/Subsystem/actuators#MKK

On Thu, Dec 8, 2011 at 3:05 PM, Simon Wilks <address@hidden> wrote:
> Hi Eduardo,
>
> As expected, I had the same problem with one of the eight motors not
> starting up with the Lisa/L. The solution you proposed fixed it. So it was
> nothing specific to your setup.
>
> Thanks very much!
>
> Simon
>
>
> On Mon, Dec 5, 2011 at 6:21 PM, Eduardo lavratti <address@hidden>
> wrote:
>>
>> Simon,
>> if you have problem with motor tell me .
>> I make a modification and solved the problem.
>>
>> i need know if it is a issue with my esc or with all i2c escs.
>>
>> ________________________________
>> Date: Mon, 5 Dec 2011 10:29:10 +0100
>> From: address@hidden
>> To: address@hidden
>> Subject: Re: [Paparazzi-devel] Rotorcraft Mixing Values for an Octocopter
>>
>>
>> Hi Eduardo,
>>
>> Thanks! I will give that a try.
>>
>> I have almost finished assembling everything. I have wired up two motors
>> and just need to solder the other six. I am using MKK controllers and a
>> Lisa/L board.
>>
>> I am expecting I am going to have a problem getting all motors started as
>> I have a Lisa/L like you but I hope to be able to be at the point of testing
>> the motors tonight or tomorrow night.
>>
>> Thanks
>>
>> Simon
>>
>> On Mon, Dec 5, 2011 at 3:36 AM, Eduardo lavratti <address@hidden>
>> wrote:
>>
>> Simon,
>> use this values for your airframe.
>> I am not sure about yaw signals.
>> If you have problem change the signals @ yaw line.
>>
>> have you assembled you aircraft ? all motors start ?
>> What kind of esc are you using ? i think you using MK esc right ?
>>
>>   <section name="ACTUATORS_MKK" prefix="ACTUATORS_MKK_">
>>     <define name="NB" value="8"/>
>>     <define name="ADDR" value="{ 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e,
>> 0x60 }"/>
>>   </section>
>>
>>    <section name="SUPERVISION" prefix="SUPERVISION_">
>>     <define name="MIN_MOTOR" value="11"/>
>>     <define name="MAX_MOTOR" value="220"/>
>>     <define name="TRIM_A" value="0"/>
>>     <define name="TRIM_E" value="0"/>
>>     <define name="TRIM_R" value="0"/>
>>     <define name="NB_MOTOR" value="8"/>
>>     <define name="SCALE" value="256"/>
>>     <define name="ROLL_COEF"  value="{ 256, -256, -256, -256, -256,  256,
>> 256,  256 }"/>
>>     <define name="PITCH_COEF" value="{  256,  256,  256, -256, -256, -256,
>> -256,  256 }"/>
>>     <define name="YAW_COEF"   value="{ -256,  256, -256,  256, -256,  256,
>> -256,  256 }"/>
>>     <define name="THRUST_COEF" value="{ 256,  256,  256,  256,  256,
>> 256,  256,  256 }"/>
>>   </section>
>>
>>
>> regards
>>
>>
>>
>>
>>
>> ________________________________
>> Date: Sun, 4 Dec 2011 21:56:32 +0100
>> From: address@hidden
>> To: address@hidden
>> Subject: [Paparazzi-devel] Rotorcraft Mixing Values for an Octocopter
>>
>>
>> Hi
>>
>> I am having some trouble working out how calculate the roll/pitch/yaw
>> coefficients for an octocopter. I have been following
>> the http://paparazzi.enac.fr/wiki/RotorcraftMixing guide but I am not
>> getting it (btw, I think the x,y axis labels in the diagram need to be
>> swapped).
>>
>> Given that the octo is configured as indicated in the attached image, what
>> values should I be using for the A matrix? All arms are of identical length.
>>
>> Thanks,
>>
>> Simon
>>
>>
>>
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