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Apr 14, 2015, 06:42 AM
Registered User
Thread OP
New Product

LKTR120 - brushless Micro FPV Quad, Naze32, Oneshot, under 80g/3oz AUW


LKTR120 = "electro-one-twenty"


CAUTION
DO NOT BUY the LKTR120:
- if you've never build a quad before
- if you are not comfortable with soldering on very tiny components
- if you do not want to DIY components like the power distro made from a PCB and other stuff
- if you do not want to drill prop holes to the required diameter
- if you do want a ready-to-run plug-and-play platform.



Here is my recommended setup and components list for the LKTR120

LKTR120 frame and 4x DP03 6500kv motors
look on banggood com or overskyrc. com

LKTR120 frame only
(incl. top/bottom frame plates and hardware) http://www.overskyrc.com/lktr120-mic...ame-p-626.html

Frame build pics http://fpvlab.com/forums/showthread....-LKTR090/page9

Landing gear is not included in the frame kit, can be made from 3mm antenna tube. But not necessary to have a landing gear, I dont use a landing gear anymore.
Power distribution board is not included in the frame kit, can be made from 1mm copper clad PCB
Rubber bands to attach Lipo not included in frame kit. Make sure you get a very tight fit of the Lipo, if the lipo moves/vibrates during flight you will get some nasty effects. Good rubber bands are ladies hair bands: http://www.ebay.com/itm/250-Small-Bl...-/271767106324
Cable ties 2mm (NOT 2.5mm, will not fit!) not included in the frame kit, to mount VTX etc: search ebay for "black cable ties 2mm"

Motors
DP03 6500kv http://www.overskyrc.com/dp03-35g-br...0kv-p-649.html
CW or CCW doesn't matter, micro jst connector can be cut as the motor wires are best soldered to the ESC directly

Props
Walkera Ladybird / QR Scopion 56mm http://www.chinesejade.com/walkeraQRSP.htm or http://www.banggood.com/buy/Ladybird-propeller.html

1.45mm drill bit to widen the prop hole (perfect friction fit of props on 1.5mm DP03 motor shafts)
search Ebay for "1.45mm drill bit"
Instructions http://fpvlab.com/forums/showthread....l=1#post655759

ESC options

UPDATE Aug.2015
KISS 12A v1.1 Oneshot125 enabled. great power, great startup, fit the frame (tight but ok).

MultiStar ESC worked well for me but startup is not perfect every time and some people reported major issues, so not recommended anymore:
MultiStar 6A https://www.hobbyking.com/hobbyking/s...OPTO_2_3S.html
great performance, very good filtering (very little noise in the video)
MU-3A http://www.overskyrc.com/mu3a-2s-spe...esc-p-553.html
not test flown yet but performance on thrust stand looks very good

LiPo Battery
2S 450 mAh https://www.hobbyking.com/hobbyking/s...dProduct=26734 or similar speced LiPos
LiPo Connector for E-Flite Blade 130 is a 2mm pitch 3-pin JST PH connector:http://www.ebay.de/itm/10-x-connecto...-/301591501455

Flight Control Board (FC) AfroMini 32 http://abusemark.com/store/index.php...lck624copdvfh3
AfroMini does not have onboard USB, you need an FTDI adapter like this one: http://www.rctimer.com/product-684.html
To make it plug-and-play with FTDI you can solder a 4-Pin 1.5mm micro jst connector to the AfroMini and make a custom micro JST 1.5 4-pin cable: http://www.ebay.de/itm/Micro-Mini-ZH...-/121367876357
Any other small sized FC that can run Cleanflight should also work, eg: http://www.banggood.com/OpenPilot-CC...-p-970762.html (not tested)
Flight controll board should be mounted with foam tape, NOT with cable ties (with cable ties, horzion mode will drift due to vibration issues)

Firmware Cleanflight latest version, Settings and PIDs posted below

RC Receiver: OrangeRx R100 DSM2 Compatible Satellite Receiver (or any Sat receiver around 1g) https://www.hobbyking.com/hobbyking/s..._Receiver.html
Instructions http://fpvlab.com/forums/showthread....l=1#post661599

FPV Hobby 5V step down http://www.fpvhobby.com/233-5v.html
much better filtering than the the pololu

FPV Camera 600TVL 120degree Wide Angle Super Mini FPV Camera with MIC http://www.surveilzone.com/600tvl-12...ith-mic-CC1563
or similar sized cameras available at Banggood.com etc. - the frame is designed to fit this kind of camera exactly
Lens can be exchanged with HK HD Wing Cam lens to get a better FOV. Lens thread is M7x0.35

Video Transmitter 1280 mini 200mw VTX http://www.fpvmodel.com/1280mhz-200m...itter_g68.html
or 5.8 gHz micro VTX (weight should not exceed 6g incl antenna)

Optional HD 720p recording cam

http://www.banggood.com/Hubsan-X4-H1...-p-912169.html
Pin out to power the cam http://fpvlab.com/forums/showthread....l=1#post643404

Tools and various stuff needed for building:
Fine tip soldering iron
26 AWG servo wire or smaller
Hex and philips screwdrivers for M2 and M1.4 screws
Heatshrink and tape for isolation
Cable ties 2mm

PID Settings
Latest PIDs and stettings (July 2015) https://www.rcgroups.com/forums/show...&postcount=388

(2 min 48 sec)

(1 min 53 sec)

(2 min 42 sec)

(4 min 22 sec)

(3 min 37 sec)

(2 min 49 sec)

(1 min 34 sec)

(1 min 39 sec)
Last edited by LKTRSMG; Sep 04, 2015 at 04:19 PM.
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Apr 14, 2015, 06:43 AM
Registered User
Thread OP
Here are my first impressions and the remaining issues:

- The frames seem indestructable so far, even props rarely break in crashes
- Motor/prop combinations deliver the expected power, even on the less powerful performing YEP7A ESC
- runtime on the 72g AUW 120 is around 6 minutes of acro action
- Video and RC-Link are better than I had expected and give great range even beyond LOS
- Cam performance looks really good so far for a below 3g cam, will also test the stock lens.

Remaining issues:
- motor noise in the video: on the YEP7A 120 its ok, on the 90 its really bad, not yet tested on the MultiStar 6A 120.
Needs fixing, Pololu Step Down alone will not do the job on the 90 I think

- Using H107C 720p recording cam powered from the flight lipo introduces lots of video noise - This also seems to be a power filtering issue. If you only want the live feed anyways, this is no issue.

- Tuning of PID and other FC parameters to improve flight performance.
I think its clear from the multiple videos I posted here that the flight performance of the 120 is already ok and flyable - but it could be much better I think. On the 90 it really needs alot more tuning - But still, this should be fixable, I will try different looptimes etc., using other PID controller (using the on "0" PID algorithm in the vids), more PID tuning, maybe autotune

- Support for oneshot / damped light mode would be nice, but have not found the proper escs or firmware yet


To sum it up, I think both frames are ready to be released - But please keep in mind that this is still a work in progress and these builds are neither cheap nor good "my first quadcopter" projects. I do not need to mention that you need a fine tip soldering iron and tools to work on these micro machines - as seen in the development thread on fpvlab.
Apr 14, 2015, 07:42 AM
Multirotor Promotor
RaymondM's Avatar
Congratulations on a great little fpv quad!
Apr 14, 2015, 04:02 PM
Registered User
cfischer's Avatar
Been lurking fpvlabs watching this unfold. Very awesome.

Where did you get the microscopic constant current source for the leds?
Apr 14, 2015, 04:29 PM
Team Warpsquad
Mr.Aaron's Avatar
Ordered Have been following your build and look forward to doing mine. Thank you for all of your effort and time put into this and more importantly for allowing others to build one.
Apr 15, 2015, 02:47 AM
Registered User
Thread OP
Quote:
Originally Posted by cfischer
Where did you get the microscopic constant current source for the leds?
here http://www.ebay.it/itm/S737-5-Stuck-...item58bfcfc291
5-Stuck-Mini-Miniatur-Konstantstromquelle-30mA

but you can also simply use resistors
Apr 15, 2015, 03:41 AM
Team MasterCard
lorents's Avatar
Nice! Subscribed

Would it be possible to tilt the CC1563 upwards in that mount?
Last edited by lorents; Apr 15, 2015 at 05:12 AM.
Apr 15, 2015, 05:58 AM
Registered User
Summitdude's Avatar
Great work, i think i need to build one of these for some garden racing !
How loud is it compared to a 250mm quad with 5030 gemfans ?

I know my 120mm Ladybird quad is pretty silent but it has brushed motors so i dont know how it compares. The reason i ask is becouse i dont want to disturb the neghbours to much
Apr 15, 2015, 07:01 AM
Registered User
Thread OP
its really quite compared to a 250 on 5" - you wont hear it at all if its a little further away. Close by its more like a swarm of moskitos
Apr 15, 2015, 02:34 PM
Registered User
Thread OP
Quote:
Originally Posted by lorents
Would it be possible to tilt the CC1563 upwards in that mount?
The frame is designed around the cam board mounted at no angle. But you could put some washers between the standoffs giving a bit more space for the lens so it can be tilted upwards.

If you look at my videos above I think its not really necessary though, even at high speeds.

here are close up pics with the cam
Apr 15, 2015, 04:15 PM
many trades, master of none
Might ditch my 250 for one if these! Is it worth it?
Apr 15, 2015, 10:33 PM
Multirotor Promotor
RaymondM's Avatar
Yes
Apr 15, 2015, 10:44 PM
Team Drone Art
Daryoon's Avatar
Looks good.
Apr 16, 2015, 02:07 AM
Team MasterCard
lorents's Avatar
Quote:
Originally Posted by LKTRSMG
The frame is designed around the cam board mounted at no angle. But you could put some washers between the standoffs giving a bit more space for the lens so it can be tilted upwards.

If you look at my videos above I think its not really necessary though, even at high speeds.

here are close up pics with the cam
Thanks! Guess I'll replace the nylon standoffs with some slightly longer ones. They are 3mm's?
Apr 16, 2015, 02:49 AM
Registered User
Thread OP
they are M2 - so 2mm. I use 10mm length but you could also use 15mm, see here: http://www.ebay.de/itm/10-Stuck-Abst...-/201169259720

Other option is to cut pieces from 3mm antenna tube with self tapping screws.

Using M3 standoffs is possible (you'd need to drill frame holes to 3mm) but comes at a weight penalty of course
Last edited by LKTRSMG; Apr 16, 2015 at 02:57 AM.


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