Hey all, I just finished my new 2s toothpick build to round out my stable. I am addicted to these little things. 3/4 Weeks ago I had only 1 quad, a digital 5".
Now I also have a 1s Babytooth, a 2s Crux3, a 3s GEPRC Phantom HD.

Here's my new build:

FRAME:              Crux3 3"  Price: $11   https://www.racedayquads.com/products/ha...255b&_ss=r
Flight Controller:  DarwinFPV 15a AIO  Price: $40  https://pyrodrone.com/products/darwinfpv...-whoop-aio
Motors:               APEX RACING 1202.6 6666kV  Price: $12 x4 ($48)  https://pyrodrone.com/collections/12xx/p...oose-color
vTx:                   PandaRC Nano  Price: $18   https://www.getfpv.com/pandarc-nano-16x1...-u-fl.html
RX:                    TBS CrossFire Nano Rx Price: $25   https://pyrodrone.com/products/tbs-crossfire-nano-rx-1
Canopy:              BeeBrain V2  Price: $3   https://pyrodrone.com/products/beebrain-...olor-mount
Camera:              Caddx Baby Ratel  Price: $26    https://www.getfpv.com/caddx-baby-ratel-...amera.html









Here it is in between my 1s and 3s:


I will maiden tomorrow morning and let you know how it goes.  So far I've just put in my PIDs from my 1s build 100/60/80.  Do you think that will work for 2s? or should I start from standard BF 4.2.5 PIDs and work from there?  on my 1s it had terrible wobble at low throttle until I used those high PIDs.

No idea how it will work long term, but so far I'm impressed with the DarwinFPV 15a AIO. The wiring diagrams online are for the original version that only had 1.5 uArts. New version has 2 full uArts, and all the pads are easy to solder to and laid out well so all 'like pads' are next to each other.

So far I would recommend it, but as I said I haven't flown it yet.

the pids will cause oscillations, they are way to high for 2s,
you might risk burning motor with a d value of 80.

you said you have wobbles on 1s until tuning, boost startup/rampup power in blheli configurator/suite does match 1s builds often better.

my suggestion for your build is; go straight for emuflight or bf3.5.7. it matches this sort of build better.

thanks

I put the PIDs back to stock 4.2.5 for now. I'll maiden tomorrow and adjust from there.

On my 1s build I was getting crazy wobbles when I was at low/no throttle. I put in PIDs from someone's tuning video (KabobFPV's I think) of 100/60/80 and it flies perfect now.

For this 2s build I'll just try stock 4.2 PIDs and go from there. If it doesn't work then ill try emu, or 3.5.7 but if at all possible I'd like to stay on current BF that way all my quads are the same. I'm still pretty new to this, and extremely new to tuning. Thanks for the help.

I’m a complete NOOB with tuning. I fly stock pids, and adjust the rates.. I did however add rpm filtering and a “profile” from uav futures to my 5”… BIG DIFFERence!

Yeah I am now running RPM Filtering/Bi-Directional D-Shot on all my quads. I tried it on my 5" first, and instantly almost all of my prop-wash went away. Obviously bad piloting can always cause it dropping into dirty air, but otherwise it just disappeared with that one setting, and I was kicking myself for putting it off for so long.

So now I have flashed my 3 new micros with BLHeli_M (v16.9), and turned on RPM filtering.

My 1s was the first quad I really tried to PID tune, because I was getting such bad wobbles whenever I dropped throttle. I could fly 'around it' but keeping throttle above ~25%, but it wasn't until I use KabobFPV's PIDs from his website that I got that 1s feeling perfect. They are really high PIDs though, that's why I wanted to ask about 2s. For this 2s build I'm going with stock 4.2 BF PIDs + RPM Filtering and 1.2 on the Filter sliders. We'll see how it goes in the morning.

https://theuavtech.com/presets/
the preset from uavthech for "toothpicks" might be a good startpointbif you choose bf4.2.

just to mention, i love bf4.2 for 5inch quads. my suggestion about emuflight is about the kind of quad, most of my micros run emuflight. emuflight has a lot of tuning presets integrated in to the configurator, its based on betaflight, handling and look is the same.

take care by not overload the cpu by use rpmfiltering on that board. you can check the cpu load by command "tasks" in the cli tab. its just an f411? so i would choose 2k and dshot150.
i often fly without rpmfiltering on f411 boards.

On DShot 600 with RPM filtering enabled at 8k hz it runs at about 60% CPU load. 
Right now I have it at 4khz and it sits right at 10% load.

I'll take a look at UAV Techs presets.

Right now I set RPM filtering on with usual filter settings, and filter sliders @ 1.2,. With 1 profile on stock pids with D min on, profile 2 stock pids with D Min OFF, and Profile 3, I turned up the PD Gain slider a few notches.

I'll try them out and go from there.

Hi MrSolo,

First, that is a very nice looking build.   Impressive. GOOD JOB  

Well, I always like to try each build with the FC board just as I received it;
with the firmware that it came with and default factory tune. 
Just to see how the quad flies, check flight characteristics...just see how it does.
Then go from there. Point is, I don't change anything until I see how it flies.
If there is an issue, then I might consider changing something.

Consider this...how can you really evaluate an FC board unless you try it with the default factory settings. 
Wouldn't you want to know how it performs before tinkering around with it ???
That provides the baseline, the point to judge from.

In fact, I would like to know how it performs "right out of the box".

Interestingly, all of my builds are running what ever version of Betaflight that they came with
and all stock tunes. So far, I haven't changed any PID settings on any of them. 
For me, they all fly just fine...no reason to change anything.

If it Ain't Broke, Don't Fix it.

That said, I am not a high performance pilot and rarely fly Acro or do stunts.

(14-Jul-2021, 01:34 AM)MrSolo Wrote: On DShot 600 with RPM filtering enabled at 8k hz it runs at about 60% CPU load. 
Right now I have it at 4khz and it sits right at 10% load.

I'll take a look at UAV Techs presets.

Right now I set RPM filtering on with usual filter settings, and filter sliders @ 1.2,. With 1 profile on stock pids with D min on, profile 2 stock pids with D Min OFF, and Profile 3, I turned up the PD Gain slider a few notches.

I'll try them out and go from there.

you need to check the cpu load by command "tasks" in the cli. the average load and max load are the important numbers.

the update frequency need to match the motorprotocol, otherwise you loose some cpu load withput benefit. dshot150 matches 2k / dshot300 matches 4k / dshot600 matches 8k

(14-Jul-2021, 04:24 PM)hugnosed_bat Wrote: you need to check the cpu load by command "tasks" in the cli. the average load and max load are the important numbers.

the update frequency need to match the motorprotocol, otherwise you loose some cpu load withput benefit. dshot150 matches 2k / dshot300 matches 4k / dshot600 matches 8k

OK Thanks!  I just set it to DShot300, with PID loop Freq @ 4k.  It now says Max Load 80%, Avg Load 60%.

I also put the PIDs back to stock on my #1 profile but with added RPM Filtering, and changed to props out as that is my standard.

Unfortunately I didn't get to maiden it this morning. As I was trying out different props on my 5" (looking for quietest props) the park sprinklers can on and sprayed all over me + my gear.  Thankfully I was in middle of changing props and not in air so I was able to slam my case shut over my goggles in time, but it sprayed all over my Tango 2, and all over my little quad.

Tango 2 is fine as it doesn't really have anything exposed.  I took my Crux3 2s back home and blew it off with compressed air, plugged in a battery and it seems OK.  But because I was afraid to try to fly it after getting it so wet, and because I lost a prop nut for my 5" in my hasty bag-closing to avoid the water my flying for the day was done.  It's already starting to get hot so I'll have to try it tomorrow morning.

Thanks for all the help with this guys.

(14-Jul-2021, 01:08 PM)iFly4rotors Wrote: Hi MrSolo,

First, that is a very nice looking build.   Impressive. GOOD JOB  

Well, I always like to try each build with the FC board just as I received it;
with the firmware that it came with and default factory tune. 
Just to see how the quad flies, check flight characteristics...just see how it does.
Then go from there. Point is, I don't change anything until I see how it flies.
If there is an issue, then I might consider changing something.

Consider this...how can you really evaluate an FC board unless you try it with the default factory settings. 
Wouldn't you want to know how it performs before tinkering around with it ???
That provides the baseline, the point to judge from.

In fact, I would like to know how it performs "right out of the box".

Interestingly, all of my builds are running what ever version of Betaflight that they came with
and all stock tunes. So far, I haven't changed any PID settings on any of them. 
For me, they all fly just fine...no reason to change anything.

If it Ain't Broke, Don't Fix it.

That said, I am not a high performance pilot and rarely fly Acro or do stunts.

Good point about trying it stock first.  I guess I was just assuming it would NEED to be tuned because of my experience with my 1s build on a BetaFPV board.  It flew so loose on stock pids, and when I cut throttle it wobbled so bad I would almost loose the horizon.  Once I put in KabobFPV's PIDs for 1s it flew great, so I think I just assumed I would need to do the same for 2s.

I put it back to stock PIDs, but with RPM filtering enabled and Props-Out config as that's how I setup my quads. I'll try again tomorrow morning as I had an unfortunate incident with the park sprinklers this morning.

I “kinda” had the same experience when I built my 1s kabab toothpick… it flew, but it was SENSITIVE!! I knew nothing about rates.. when I did, it made a whorls of difference.. if I remember correctly I have the Betafpv 1s fc and it originally set up for a whoop… I think..
Uav futures “profiles” are real good place to start.. and pretty “safe”.. I had asked A. Ciotti (Ciottifpv) about pushing the tune to as close to perfect .. he said you can, but as soon as the quad is no longer “clean”(bent prop), it can cause u to smoke a component..
Like I said, I’m still a noob, and I have the tendency to feed my quads asphalt and concrete for lunch.. my current daily flyer has rhe mamba f4 405 with CHEAP Emax (4 for $25)motors.. been crashing the crap out of it, no smoke (jinx) as of yet. Bent props and all.. basic rpm fitering, bidirectional d-shot, uavfuters 5” profile.. and oh, I did purchase the licenses for my aio esc…

(14-Jul-2021, 05:24 PM)MrSolo Wrote: OK Thanks!  I just set it to DShot300, with PID loop Freq @ 4k.  It now says Max Load 80%, Avg Load 60%.

I also put the PIDs back to stock on my #1 profile but with added RPM Filtering, and changed to props out as that is my standard.

Unfortunately I didn't get to maiden it this morning. As I was trying out different props on my 5" (looking for quietest props) the park sprinklers can on and sprayed all over me + my gear.  Thankfully I was in middle of changing props and not in air so I was able to slam my case shut over my goggles in time, but it sprayed all over my Tango 2, and all over my little quad.

Tango 2 is fine as it doesn't really have anything exposed.  I took my Crux3 2s back home and blew it off with compressed air, plugged in a battery and it seems OK.  But because I was afraid to try to fly it after getting it so wet, and because I lost a prop nut for my 5" in my hasty bag-closing to avoid the water my flying for the day was done.  It's already starting to get hot so I'll have to try it tomorrow morning.

Thanks for all the help with this guys.

the cpu load seems to high.
betaflight developers suggest an average load of 30% and a max load of 70%, you might get better performance by use of 2k/dshot150

https://intofpv.com/t-rpm-filtering-setup

Yeah, that cpu load seems REAL high…besides the changes suggested. I think I remember Bardwell “de selecting “ things on betaflight and it helped lower the load a little