Tri-copter servo

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westwind
Posts: 29
Joined: Sun May 18, 2014 1:01 am

Tri-copter servo

Post by westwind »

Using the cirus se 2.5 board. When I plug my servo into the yaw channel it stuttered then went over to the right, then the board stopped responding. If I plug direct into the RX it is fine, I swapped servos and the new one works but sounds like it is binding in the neutral position.

Can any one help with this

AkaMrBill
Posts: 31
Joined: Tue Jan 14, 2014 5:40 pm
Location: Elk Grove, Ca

Re: Tri-copter servo

Post by AkaMrBill »

What brand and model servo? Analog or digital? What servo frequency do you have set in the cofig.h file?

westwind
Posts: 29
Joined: Sun May 18, 2014 1:01 am

Post by westwind »

Th 65mg, digital servo, set to 300

westwind
Posts: 29
Joined: Sun May 18, 2014 1:01 am

Post by westwind »

Servo is from twisted hobbies

AkaMrBill
Posts: 31
Joined: Tue Jan 14, 2014 5:40 pm
Location: Elk Grove, Ca

Re:

Post by AkaMrBill »

westwind wrote:Servo is from twisted hobbies


This servo? http://www.twistedhobbys.com/Servo-TH-DMG65-Digital-Metal-Gear-Servo-DMG65.htm
Or this servo? http://www.twistedhobbys.com/Servo-TH-MG65-Metal-Gear-Servo-MG65.htm

If the second, it is analogue and shouldn't be fed at 300Hz.

When the servo stuttered, then went to the right, was it during take-off, or just sitting on the bench? If during take-off, there might be another issue.

westwind
Posts: 29
Joined: Sun May 18, 2014 1:01 am

Post by westwind »

The first servo, this is on the bench. Haven't flow yet, still testing the build

AkaMrBill
Posts: 31
Joined: Tue Jan 14, 2014 5:40 pm
Location: Elk Grove, Ca

Re:

Post by AkaMrBill »

westwind wrote:The first servo, this is on the bench. Haven't flow yet, still testing the build


OK, proper setup for servo, check.
Stable when connected to the receiver, check.
Unstable when connected to the FC, check.

Have you monitored the outputs with MultiWiiConfig? What does it show for the Yaw servo output, jittery or stable?
Does it show stable Acc and Gyro input, or jittery?
Have you calibrated the FC while it is stationary?

westwind
Posts: 29
Joined: Sun May 18, 2014 1:01 am

Post by westwind »

If I remember right everything is stable, yes acc and meg have been calibrated a few times, no change

AkaMrBill
Posts: 31
Joined: Tue Jan 14, 2014 5:40 pm
Location: Elk Grove, Ca

Re:

Post by AkaMrBill »

westwind wrote:If I remember right everything is stable, yes acc and meg have been calibrated a few times, no change

OK, My guess then is that, based on everything we have covered so far, and the signals showing steady, then it is likely the output from the board it's self is defective.
The software thinks it's right, as demonstrated by the stable signals displayed, but apparently the signal is jittery, causing the servo to misbehave. So, I'd say you have a bad board.

westwind
Posts: 29
Joined: Sun May 18, 2014 1:01 am

Post by westwind »

Ok, just wondering if the magnetic declination might affect this? Also should I try to reload the sketch and start over

AkaMrBill
Posts: 31
Joined: Tue Jan 14, 2014 5:40 pm
Location: Elk Grove, Ca

Re:

Post by AkaMrBill »

westwind wrote:Ok, just wondering if the magnetic declination might affect this? Also should I try to reload the sketch and start over


You may wan to try it without the Mag enabled.

Reloading the board can't really hurt, so I say, go for it.

westwind
Posts: 29
Joined: Sun May 18, 2014 1:01 am

Post by westwind »

How do you disable mag

AkaMrBill
Posts: 31
Joined: Tue Jan 14, 2014 5:40 pm
Location: Elk Grove, Ca

Re:

Post by AkaMrBill »

westwind wrote:How do you disable mag


If you have the Mag configured in Config.h, it should show up in the MultiWiiConf GUI. IIRC, it should have an "Aux" channel selection assigned to it that allows you to turn it on or off.

Sorry, I've never used a Mag yet, so this is just my understanding of how it "should" operate.

westwind
Posts: 29
Joined: Sun May 18, 2014 1:01 am

Post by westwind »

With my servo problem, I've noticed that the one servo that fails the board will also spike all sensors as seen in the gui interface. I think this servo has an internal short.

westwind
Posts: 29
Joined: Sun May 18, 2014 1:01 am

Post by westwind »

Problem fixed, using SPC on Hitec Optima 9 some how interferes with the power on the multiwii board. Removed spec, everything works

AkaMrBill
Posts: 31
Joined: Tue Jan 14, 2014 5:40 pm
Location: Elk Grove, Ca

Re:

Post by AkaMrBill »

westwind wrote:Problem fixed, using SPC on Hitec Optima 9 some how interferes with the power on the multiwii board. Removed spec, everything works


SPC is designed to power the receiver directly from the battery, but does not power anything else, just the receiver. If you did not provide a second power source to the FC, like a UBEC or a BEC on the speed controller, then you were not properly powering the FC or servo.

westwind
Posts: 29
Joined: Sun May 18, 2014 1:01 am

Post by westwind »

No, I was powering the fc separately. Also happens if SPC is removed and ubec is plugged into receiver instead of fc. I wonder if my reciver has some kind of internal glitch.

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