Replies to This Discussion

3D RoboticsPermalink Reply by Chris Anderson on September 16, 2010 at 9:05pm

Hi Michael,

If you use the optocouplers, you need an independent power supply for the servos. That's why they don't work on the board to servo side.

Please upload your config file and I'll try to diagnose your setup.

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Permalink Reply by Michael Dean on September 16, 2010 at 10:13pm

files attached

Attachments:

• skywalker header file.txt, 9 KB
• Ardupilot2_7.txt, 21 KB

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3D RoboticsPermalink Reply by Chris Anderson on September 16, 2010 at 10:18pm

Can you try #define RADIO_TYPE 1

Also, just want to confirm that you've soldered your underboard jumper wires as described here.

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Permalink Reply by Michael Dean on September 17, 2010 at 12:29am

makes it worse on Type 1 ( not to mention goes full throttle when u click the switch up one :D )

disconnected the motor and gave it a few goes, stabilization is worse, fly by wire has less jitter.

i read somewhere in the manual i should be TYPE 0 for my JR 2.4ghz radio i have a JR11X

Attachments:

• IMG_1663.JPG, 152 KB

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Permalink Reply by Richard Green on September 17, 2010 at 11:23am

I have exactly the same problem with version 2.7 (the servos are rock steady in version 2.6). I raised an issue here http://code.google.com/p/ardupilot/issues/detail?id=19&can=1 concerning it. Jason thinks that it is a resource issue that can either be fixed by reducing the load on the Arduino (no GCS, no radio setup etc.) or waiting until another release uses better libraries. I could not stop my servos jittering by altering the headers so will wait until a new version is released and try again.

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Permalink Reply by Michael Dean on September 17, 2010 at 9:09pm

so should i give 2.6 a go ?

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Permalink Reply by Michael Dean on September 19, 2010 at 2:00am

could the gain on the IMU have anything to do with it, in particular this part

// LPR530 & LY530 Sensitivity (from datasheet) => 3.33mV/º/s, 3.22mV/ADC step => 1.03
// Tested values : 0.96,0.96,0.94
#define Gyro_Gain_X 0.92 //X axis Gyro gain
#define Gyro_Gain_Y 0.92 //Y axis Gyro gain
#define Gyro_Gain_Z 0.94 //Z axis Gyro gain
#define Gyro_Scaled_X(x) x*ToRad(Gyro_Gain_X) //Return the scaled ADC raw data of the gyro in radians for second
#define Gyro_Scaled_Y(x) x*ToRad(Gyro_Gain_Y) //Return the scaled ADC raw data of the gyro in radians for second
#define Gyro_Scaled_Z(x) x*ToRad(Gyro_Gain_Z) //Return the scaled ADC raw data of the gyro in radians for second

because flicking to stabilization to me its the IMU taking over and starts the jitter similar to setting up a heli gyro ?

Attachments:

• ArduIMU.txt, 19 KB

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Permalink Reply by Michael Dean on September 19, 2010 at 3:36am

i gave 2_6_2 ago and its working fine .. no jitter.

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Permalink Reply by Samuel on December 16, 2010 at 7:40am

I have the same problem. When i switch to stabilize the servo starts to jitter a bit. It does not happen in the 2.6 version, but in that version the servo reacts very dull, so i want to stick with the 2.7 version. Even if i dont change anything in the code and just upload the standard version it jitters...

 

anyone found the problem yet?

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