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Re: [Paparazzi-devel] LISA_M FixedWing and PPM radio


From: Eduardo lavratti
Subject: Re: [Paparazzi-devel] LISA_M FixedWing and PPM radio
Date: Sun, 18 May 2014 18:34:06 -0300

Gautier, have you idea way the servos work flapping when i use the ppm radio and soft derivation ?
Maybe a timming issue ?



Date: Sun, 18 May 2014 22:22:44 +0200
From: address@hidden
To: address@hidden
Subject: Re: [Paparazzi-devel] LISA_M FixedWing and PPM radio

In addition, I can tell that at time of the infrared sensors for attitude estimation, pitch gyros were barely never used, hence the "D" gain was applied after a "soft" derivation.
Using directly the gyro for this is fairly recent then. Felix made it the default in master today, but it is only available for "adaptive" and "new" control subsystem. The standard control keeps the old way.

Gautier

Le 18/05/2014 22:14, Eduardo lavratti a √©crit :
Are you using PPM radio ?

The define USE_GYRO_PITCH_RATE, as the name say, use gyros for pid "D" part.


Date: Sun, 18 May 2014 15:54:08 +0300
From: address@hidden
To: address@hidden
Subject: Re: [Paparazzi-devel] LISA_M FixedWing and PPM radio

I use a lisa/m with my X8 and i haven't noticed anything like that but then again i use an external IMU
with Paparazzi 4.2 as i have't got time to update the software on that airplane.
What "USE_GYRO_PITCH_RATE" does?
Chris




On 05/18/2014 07:37 AM, Eduardo lavratti wrote:
Hello,
anyone flying PLANE with lisa/m and using ppm radio

Today i start do tune my talon plane using lisa/m and cppm receiver. I am using frsky d4r-ii
I set the pitch_d parameter to have some damping in pitch axis.

In MANUAL / AUTO2 the pitch_d work fine but when i change to AUTO1 the elevator servos start to flap like crazy.

If i remove the ppm signal the flapping stop and i can confirm that the pitch_d parameter also work in auto1.

When i connect the ppm signal the servos start to flapping again.

I not have any spectrum or sbus receiver to do other tests .

Anyone know this issue ?

i will verify if this problem occur in lpc boards (yapa) too



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