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Permalink Reply by Jeremy on July 11, 2010 at 2:16pm

My ardupilot setup has similar issues though I have been running a UDB for awhile now since my issues with my servo twitching has yet to be sorted out.

Though mine did this from the very beginning but your issues sound identical to what is happening to my ardu setup. Wish I could offer a solution as I would like to actually get my ardu to fly.

I also have tried all you have as well and a few others tweaks

So as to get others to help more you may want to post all the info you can about your setup like radio and frequencies and post of a video of the twitching. Just my 2cents.

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DeveloperPermalink Reply by jasonshort on July 11, 2010 at 3:02pm

You have a bad connection in the connector or wire...

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Permalink Reply by Jeremy on July 11, 2010 at 3:09pm

For me wasnt the case according to Chris.

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DeveloperPermalink Reply by jasonshort on July 11, 2010 at 3:19pm

Can you load some other code such as the sensor tester? Do you get smooth IR reads? Do the servos twitch?

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Permalink Reply by Jeremy on July 11, 2010 at 3:28pm

For me I can no longer test my stuff as Chris has it but I went through all all that stuff and much more before sending off for another opinion and according to everyone else at the time the tests were showing normal results it was just a servo twitching issue. Hopefully BriFly's issue is his connector or wiring got loose or maybe he knocked solder connection on one of the sensors to hard.

i just wanted to let him know that if he tries everything else I am stuck in a similar issue. I myself even replaced the shield and things like that as well, another person on here found his similar issue was solved by fixing the power line of his servos because some of the 2.4 futabas are running 2 volts or some where there abouts. I never could try his fix as all my stuff was shipped off already. I just know how frustrating it can be. For me UBD has been the easiest and most successful, as the only issues I have had were tuning issues which is what I was expecting for ardu.

@BriFly
Have you made sure the lenses are clean, such as no film of some kind or dirt or something similar. I am sure you have. Have you checked your solder connections? If you are using the same futaba 7c as I am I can post all the things I tried in case one may work for you.

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3D RoboticsPermalink Reply by Chris Anderson on July 11, 2010 at 4:09pm

Jermey, I'm still testing yours. I still can find anything wrong with it--it's performing perfectly so far--but I'll keep trying things to see if I can replicate your problem.

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Permalink Reply by Jeremy on July 11, 2010 at 4:15pm

I know and appreciate the effort just was trying to help out as was same setup as mine and sounds like a similar issue with the servos.

My bad !

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Permalink Reply by BriFly on July 11, 2010 at 8:40pm

I'm travelling on business until next week....but to answer some questions:
Yes I made sure the lenses were clean and all the connections were solid. I checked all the solder joints nad eben rebuilt the setup with a new board and shield. I also made new wires and repalced all the wires to have the same thing happen. I still can't figure out why it was working for a dozen times and now isn't. The only thing I haven't replaced is the Thermopiles which is why I'm asking the question.

I'm using a futabab PCM 72mhz receiver with a futaba 9z transmitter Jeremey....so it may be similiar to your 7c.

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Permalink Reply by Hans-Ulrich Mahr on July 20, 2010 at 4:07am

Do not blame the Thermopiles
I made the same experience. Ardupilot, blue Shield and Paparazzi Thermopiles. After testing Stabilize and Fly By wire with AirframeTest Software ok I loaded the 2.6.2 code and installed the GPS (MediaTek with adapter).
Pitch and Roll Servos went hi wire. RLL variations between 4 and 19 PCH between -6 to 18° .After following all the above recommendations finally running the Servo Test showed raw data A0 504 to 514 A1 502 to 512 A2 501 to 511 period approx. 10 data transfers. Pulling the Thermopiles Plug changed Ax Values but not the variations, now 46 to 52 and 207 to 214.

Pulling the GPS Plug changed it all to clean Thermo and Servo Operation.
Putting back the GPS, same as above. No matter if the GPS is locked or not.
All I could see so far is ~20mV Noise on 3V . see pic (AC coupled 50us/Div 10mV/Div)

Where do I find the Shield Schematics and the MediaTek Data Sheets?

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