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Strange behavior
#1
Sad 
Hi

I've finally finished my quad after some start up issues (burned motor and Esc). BUT I'm still having trouble  Sad

Had three flights yesterday in the livingrom (yeah, I know), each on approx 30-40seconds. I've seperated the quad from the battery each time.
The first flight went OK - no issues  Big Grin
The second flight went ok - no issues except from one small throttle up (not from my remote)  Dodgy
The third flight went NOT ok - Hovered for 10seconds and the quad accelerated straight to the roof, in to the wall (missed the TV Cool ) before it went under the dining room table and stopped. WTF did just happen??

My thoughts:
Some issues with the receiver?
Some general issues with the setup? (but I had some OK flights with no glitches)

Anybody can give me some pointers? Ordered from Banggood and waited, repaired, waited, troubble, waited... 2 months now and still no confidence in the quad. Starting to give up  ROFL

My Setup:
Radio - Walkera Devo10 running DeviationTX
little bee 20a esc running 14.9
DYS SE2205 2300KV 3-5S
REDCON CM703 2.4G 7CH DSM2 DSMX Compatible Receiver With PPM Output (Running PPM)
Matek LED & POWER HUB 5in1 V3 Power Supply Board + BEC 5V 12v + Low Voltage Alarm+ Tracker
NAZE32 F3 Flight Controller Acro 6 DOF
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#2
Possibly failsafe, together with wrong failsafe settings for rx and/or fc?

Can happen especially when tx is very close to rx, or because of interferences (WLAN etc).

Or did you touch ground just before? High PID can make the quad overreact on slightest impact.
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#3
Thanx for the quick reply.

I will check the settings on the RX. For the FC I've set them to trhottle down to 1150 for 4seconds. It might be smart to just make it fall out of the sky instead when failsafe is activated.

Try next time outside so interferens is less of a factor.

Did not touch the ground before, and all my PID are just out of the boc in Cleanflight
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#4
Rx antennas not covered by carbon? For example with the short spektrum type antennas it's sometimes not so easy to find a good spot to place them...
And yeah, drop on failsafe is more secure.
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#5
My first thoughts were the same as fftunes, failsafe due to short distance + 2.4ghz saturation at home.

Just my 2 cents - testing a newly built miniquad in your living room is a great recipe for disaster. I had a quad going wild once when I messed up the FC rotation setting in BF and it was a pretty scary experience even outside, I can't imagine that happening in my living room... Stay safe!
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#6
(09-Feb-2017, 03:59 PM)tozes Wrote: My first thoughts were the same as fftunes, failsafe due to short distance + 2.4ghz saturation at home.

Just my 2 cents - testing a newly built miniquad in your living room is a great recipe for disaster. I had a quad going wild once when I messed up the FC rotation setting in BF and it was a pretty scary experience even outside, I can't imagine that happening in my living room... Stay safe!

Well said.....
"Damn the torpedoes!!!  Full speed ahead!!!"
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#7
Photo 
I will go for drop on failsafe, AND test outside next time (this weekend since it is dark outside when I get home from work).

I've stretched my antennas inside the heatshrink tube. They have the same length as the tube in the picture
[Image: Dvrj86Bl.jpg]

I'm sorry for my poor english, but what does saturation means. Google did not give me full confidence...
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#8
Hm saturation... Like... there's already too much radio waves in the air, it can't take anymore.

It can happen with tx/rx alone if they're very close to each other (less than 1-2 meters), added to that there's inverted radiowave reflections off walls and flat surfaces.

Watch out, it's maybe better if you let the end of the antenna stick out of the tubes - sometimes they use kind of carbon dust to color plastic or shrink wrap, which can block radio signals.
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#9
(10-Feb-2017, 11:46 AM)Skiboy Wrote: I've stretched my antennas inside the heatshrink tube. They have the same length as the tube in the picture

You probably know this, but I suggest range-checking with the new antennas.  2.4 is picky about the length of the unshielded portion of the antennae.
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#10
saturation in this case... too much noise on the 2.4 ghz band ... to many devices speaking ... so some shout louder than others and some can't be heard...

- check the failsafe in BF/CF to drop.
- check the failsafe in the RX (via tx) how it is configured i think as guys above you have wrong setting instead of -100% you have had 100%

and when failsafe on rx kicked in... it went up.

@testing in living room 100% agreed... that is why i do it in kitchen Tongue
All the best
Grzesiek (Grisha/ Greg)

Curently flyable: Nox 5, Minimalist 112
Bench / in progres: fixing Nox 3,  Scrap
thinking about building: 450


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#11
Thumbs Up 
ahh I see. Well explained  Thumbs Up

I'll will also shorten the heatshrink for better signal.

I'm also running 2.4gHz on the WiFi with two AP internal in the house...

Next time it will be outside for sure, or in the kitchen with the microwave on  Whistling
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#12
(10-Feb-2017, 02:09 PM)Skiboy Wrote: I'll will also shorten the heatshrink for better signal.

The heatshrink does not provide shielding (if that's your thinking).  The required length for the unshielded portion of a 2.4gHz antenna is 31.25mm (but typically anything from 28.8mm to 32mm is used).  The stock antennas on the Redcon are this length and unshielded.  Sheilding is usually provided by using coax (a wire with an inner core for signal and an outer metal mesh for shielding - and the shielding must be grounded).  

Odd multiples of this length may also work (so if your wires are very close to 90mm or 150mm you may be OK).  Check out this thread on RCG: https://www.rcgroups.com/forums/showthre...ire-length
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#13
Changed the failsafe to drop out of the sky - OK
Set failsafe in TX (i think), at least the quad dies when I turn of the TX - OK (I think)
Also binded the receiver after setting the throttle to -100 in Deviationtx on Devo10 - to equal 0 throttle - OK
Following this description https://www.deviationtx.com/forum/how-to...t=20#20687

BUT
When I have hooked up everything I stay connected to Cleanflight and in the Receiver tab, I noticed something strange. All the stick movement shoved correctly, BUT the htrottle stick was received verry stuttering. Usually it went up some hundreds and then either stopped or dropped down to minimum value.
I think that either everything works or nothing when it comes to the communication between TX/RX. Could it be that my stick in the TX is bad. It is brand new and only used for some few test flights (that you know has been short and bad)
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#14
(11-Feb-2017, 04:56 PM)Skiboy Wrote: ...When I have hooked up everything I stay connected to Cleanflight and in the Receiver tab, I noticed something strange. All the stick movement shoved correctly, BUT the htrottle stick was received verry stuttering. Usually it went up some hundreds and then either stopped or dropped down to minimum value.
I think that either everything works or nothing when it comes to the communication between TX/RX. Could it be that my stick in the TX is bad. It is brand new and only used for some few test flights (that you know has been short and bad)

Does that TX provide a monitor display that shows you what the sticks are doing?  If the throttle part of that monitor display is jumping around with stick movement, yes, the issue is the TX.

The Spektrum DX6i like I have has a reputation for bad pots, and bringing up that monitor display is something I do occasionally just to see if any twitches appear with stick movement, especially if I haven't used the TX in a while.
Kevin B.
Quads:
Custom 110mm FPV, NanoQX w/DX6i
Other: 3D printing (printer buildThingiverse), electronics, AVR microcontrollers
[-] The following 1 user Likes Helibus's post:
  • fftunes
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#15
Yes it has a display, and it would suprise me if there isn't a menu where I can see that. I will give that a try.
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