Here is my quad video:



Power board doesn't exists, just I soldered + wires together and - wires together.

APM 1.4 with latest ArduCopter code. Uploaded via Mission Planner.

Did leveling process successfully

Did radio setup process successfully

Did frame set to + mode

Before everything just erased eeprom using erase command on terminal

IMU Shield is attached as you may see in video

ESCs calibrated all at once successfully.

Propellers CW and CCW successfully attached and front, back, left, right attached to APM properly.


Frame is made from Balsa Wood.


ESC: DualSky ESC 25A

Motors: DualSky 980KV (XM2830CA-12)

Battery: 3000mah 11.1V 30C


Entire quad weight: 910 grams


What do you think now?

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I don't like the looks of those extension wires to the ESCs signal connectors and tie down all your wires, I bet you're getting a lot of signal noise to the ESCs from them flailing around.  Also you should balance your props.

Thanks Ellison, I'll balance props now and re-try.

P.S. How to isolate noises? What do you suggest?

It really looks like the APM has no effect whatsoever.

Your wiring to the APM doesn't look right, give us a hires picture of that.

On at least two controllers you don't have any earth connected to the ESC's.

There are very nice and clear pictures and, drawings in the Wiki, read it again.

Yeah, I noticed the grounds too, but since they're running off the same battery, the grounds should all be referenced from the battery ground, I think.  So, I think it's alright, but I would connect the ground to the signal connectors, just to be safe.

You mean just connecting - wires and signal wires? ESC to APM or RC to APM?

You CANNOT reference anything to the ESC grounds, at the currents drawn there are huge voltage fluctuations in voltage on those wires.

All your grounds should be tied to a common point, preferably the correct PDB.

The Wiki has very clear info, collected and refined by many gifted people, and sometimes learned the hard way.

I fail to see how someone WOULD'NT  follow it.

I was not able to find anything related to ground wires in ArduCopter, I used google, tried different search keywords, nothing relevant. Could you explain or reference it? Thanks

Please see my last 3 comments in this thread

I connected only 1 ESC with all + and - and signal cable. Just 1 ESC connected with all options to power on APM and other ESCs just connected their signal cable. I learned that from here, by a comment from another expert. I was connected all ESCs with all 3 wires, they told me to just connect 1 ESC with 3 wires, so APM doesn't confuse and doesn't get power from 4 ESC.

Same goes for RC to APM connection, only 1 full (+, - and signal) connection from APM to RC. Others have just signal connected.

Any problem here?

Like I was saying, I don't think the ground connections are critical, since everything is connected via the battery ground.  So I wouldn't worry about that yet.  But tie down all the cables, to avoid introducing signal noise.  If you have electrical tape, then tape up all the connection points, so they don't jitter, and also introduce noise.

I'll balance props using tape.

I'll tape up all connection points to prevent noise and bind cables to frame.

I'll connect - cables of ESCs to APM and APM to RC. All - wires will be connected.

I'll do it in hours.

But, do you really think these stuff solve my problem? Isn't it something deeper?

Well, it's not that difficult to get a quad flying really.  People do it all the time.  Yours look relatively standard in size.  Nothing too unusual.  Everything appears to be configured properly.  So I would suspect it just needs a little tweaking.  The balancing of props important.  Once they are balanced, you will noticed the stability, greatly improves.  And from the looks of the way yours is behaving, some motors are not spinning at the same rate as others to cause the flipping. This can also be caused by uncalibrated ESCs.   Personally, I don't trust the ESC calibration routine on the APM, since it's hard to tell if all ESCs have calibrated properly.  I would definitely calibrate them with the receiver individually, then you know each is calibrated properly.


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