Author Topic: Mavic Build - iRazoR  (Read 25070 times)

Offline iRazoR

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Mavic Build - iRazoR
« on: September 04, 2017, 07:38:48 PM »
Hey Guys,

I almost finished the basic Setup of my Mavic Build to get it flying so its time to share my results.

First of all I want to mention that I have absolutly no experience with quadcopters and RC-Builds in general but some experience with electronic projects and 3D-Printing. Thanks to CdRsKuLL's Project I already learned a lot and I can only recommend to try for everbody who visit this website :)

But have a look at my Mavic Build...

The Body is printed from black PETG at Bottom, Top and Back Arms and transparent PETG for the Rest. I printed at 230°C at 0.1 - 0.2mm Layer Height. Infill is 30% for Body Parts and Arms/Legs 70-80%

Components I used so far:
1x SP Racing F3 Deluxe
4x Emax 2213 935KV CW Motors with Self-Locking Nylon Nuts
1x Hobbywing 4in1 20A Mini ESC
1x HC-SR04 Sonar Sensor
1x Naze Mini M7n GPS LITEBEE RadioLink M8N GPS SE100
1x WS2812B 2*2 LED
1x Multistar 3000mAh LiHv Battery
4x Mavic Props
1x FlySky FS-I6 Remote + Flysky FS-IA6 Receiver
1x HC-06 Bluetooth Module

Screws I used:
8x M3x6mm for Motors
2x M3x25mm for Back Legs
4x M3x35mm to connect both body parts
2x M3x20mm for Front Arms
4x M3x20mm for Top Front
2x M3x16mm for Front Feet
3x M3x25mm for Battery Bottom
4x M3x6mm for FC
4x M3x6mm for ESC
7x Insert Nuts
6x M3 Nylon Nuts

Things working so far:
- IT IS FLYIIIIIING!!!!!!
- Motors are spinning in right order and direction
- iNAV Firmware is flashed to the FC and partly configured
- Gyro works
- Accelerometer works
- GPS works
- Sonar works
- LEDs working
- Flysky Remote and Receiver working

Things not working:
- Sonar is sporadically not detected by iNAV. Have to see whats the reason

I also would like to share some problems I faced and other people might come accross too:
- The Flight Controller I ordered from Gearbest seems to be a bad quality clone unfortunatelly. The internal Compass and Barometer are disabled by iNAV because of Fault Detection Feature. That seems to be a very common Problem with Clones but it is also difficult to find a working Controller.
- When I ordered the ESC because I couldnt find the Black Widow Motors anymore I didnt expect that it might be a Problem to mount it next to the FC but actually it is not a good idea if you want to use the internal Compass of the Flight Controller. The Cables between Motors and ESC cause magnetic fields which might interfere with the compass and force your drone to fly in the wrong direction. To avoid that I tried to put the Cables as far away from the FC as possible to I decided to install the Front Motor Cables on top of the Battery plate. The Battery has still enough space and the Cables have some distance to the board but if it actually is enough space I cannot say as my Compass is not working xD
- I had to add a 1kOhm Resistor to both Sonar cables (Trim and Echo) and not only one to get it working.

Things I will probably change to solve the mentioned problems and improve the Copter:
- Use an external GPS/Compass Combo and desolder the onboard Compass should solve both problems. If you desolder the Compass the Barometer should be detected by INAV without problems. DONE
- Im planning to replace the motors with DYS BX2212 920KV Motors as they weight only the half. Those Motors would lower the total weight by about 100g

Things still to consider:
- 2-Axis or 3-Axis Gimbal?
- Which Gimbal Controller?
- Is the Runcam Split the best Cam in Size/Quality Comparison?
« Last Edit: September 15, 2017, 10:10:09 PM by iRazoR »
- David

Offline iRazoR

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Re: Mavic Build - iRazoR
« Reply #1 on: September 05, 2017, 06:46:00 AM »
More Pictures...
« Last Edit: September 14, 2017, 07:28:56 PM by iRazoR »
- David

Offline Talla

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Re: Mavic Build - iRazoR
« Reply #2 on: September 05, 2017, 10:09:19 AM »
Great Photos ... Gives me a good idea how this all goes together and I will find this quite helpful.

I too have the SP Racing F3 deluxe with magnetometer and barometer so read with interest your issues with the Magnetometer and iNav.

My own thoughts on this would be to try and shield all the DC cables passing by the FC. I am thinking of making some half round cable shields from used tin cans and some printed formers to help secure and keep shape (This is more in my mind at the moment than on paper or fusion 350!). This is the same principle as used in the old CRT TV's to stop DC voltage bending the stream of electrons on the electron gun and all they used was thin steel sheet/foil. It has to be steel or iron (magnetic) aluminium foil wont cut it! If done judiciously the weight should not be too much (hence 1/2 round tubes rather than full and positioned so they break the magnetic path to the magnetometer).

You seem to be further advanced in your project so I will follow your build with interest as I am also interested in using iNav and ultimately want to be able to set "Follow Me" mode. For now return to home would be good enough!

Talla

Offline iRazoR

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Re: Mavic Build - iRazoR
« Reply #3 on: September 05, 2017, 10:32:31 AM »
Hi Talla,
my plan was also to put some ferromagnetic material between battery and Battery Cover but as my Board is faulty I will fix it with an external Compass.

Unfortunatelly the problem with the onboard chip is not caused by the cables or anything as they are not even "under electricity" yet. It is just a bad quality chip.
Apparently it works and gets detected in Cleanflight and Betaflight as they dont have a fault detection mechanism like iNAV has but my mind is telling me to listen to iNAV fault detection and fix the problem before flying :)

Good luck with your build.

David

EDIT: Added some Photos that didnt fit in the first two posts anymore
« Last Edit: September 14, 2017, 07:33:11 PM by iRazoR »
- David

Offline Talla

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Re: Mavic Build - iRazoR
« Reply #4 on: September 05, 2017, 11:26:31 AM »
Hi David,

I have read up about the issues with the SP racing F3 deluxe magnetometer issue in the iNav forums. Some folk are eluding to iNav software not giving enough time before deciding the magnetometer has a fault.

I have not tried iNav on the FC yet but my magnetometer seems to work in Cleanflight but I had to enable it first. However, idint realise how sensitive these things are as it now thinks my north is my left PC speaker! I will need to invest in a extra long USB lead methinks  :D

I will probably end up going down the same route and replacing my current gps (NZ GPS) for a one with a magnetometer and all the additional issue this will potentially  bring to the clone build!

Will try the shielding route first as God loves a tryer!

Just found this stuff on ebay http://www.ebay.co.uk/itm/MagnetShield-Magnetic-Field-Shielding-Alloy-For-speakers-static-magnets-/122661473567?hash=item1c8f318d1f:g:k6sAAOSwF1dUT8Uo

If it doesnt work then I can always use it in my electric guitars!

Andy




Offline darozas

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Re: Mavic Build - iRazoR
« Reply #5 on: September 06, 2017, 09:05:50 AM »
I have removed my magnometer on FC but still cant have proper POSHOLD

I have fitted my in front of the quopter but still same issues working on this now.

your build looking good so far !!!

Keep it up

REgards

Offline iRazoR

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Re: Mavic Build - iRazoR
« Reply #6 on: September 06, 2017, 01:07:15 PM »
@darozas Thanks for the response. I also plan to fit it right in the top front and move the Receiver to the place that was planned for the Gimbal controller. Maybe you can share your results regarding the POSHOLD. I would really appreaciate it. I think our common target is to build the best Mavic-like experience so it would be helpful to learn from others too.

EDIT: May I ask which GPS and Compass you use?

David
- David

Offline iRazoR

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Re: Mavic Build - iRazoR
« Reply #7 on: September 07, 2017, 08:23:24 AM »
I updated the first Post with some more Details.
- David

Offline darozas

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Re: Mavic Build - iRazoR
« Reply #8 on: September 07, 2017, 11:20:47 AM »
@darozas Thanks for the response. I also plan to fit it right in the top front and move the Receiver to the place that was planned for the Gimbal controller. Maybe you can share your results regarding the POSHOLD. I would really appreaciate it. I think our common target is to build the best Mavic-like experience so it would be helpful to learn from others too.

EDIT: May I ask which GPS and Compass you use?

David

Here my mess if that helps


Offline iRazoR

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Re: Mavic Build - iRazoR
« Reply #9 on: September 07, 2017, 01:51:04 PM »
I see you used an external compass only. My idea is (and I actually ordered today) to use the Radiolink M8N GPS with integrated Compass. As far as I read the Ublox 7 GPS Chip was not the best and most of the clones donīt work very well for POSHOLD so maybe the GPS you use is the problem.

I hope with the M8 GPS I will get a satisfing result. It should arrive until weekend and I will definetly keep you updated how good (or bad) it works and looks.
- David

Offline darozas

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Re: Mavic Build - iRazoR
« Reply #10 on: September 07, 2017, 02:23:34 PM »
I see you used an external compass only. My idea is (and I actually ordered today) to use the Radiolink M8N GPS with integrated Compass. As far as I read the Ublox 7 GPS Chip was not the best and most of the clones donīt work very well for POSHOLD so maybe the GPS you use is the problem.

I hope with the M8 GPS I will get a satisfing result. It should arrive until weekend and I will definetly keep you updated how good (or bad) it works and looks.

So what did you get ??

Ublox or BN-880 ??

Waiting for your results!!!

Regards

Offline iRazoR

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Re: Mavic Build - iRazoR
« Reply #11 on: September 07, 2017, 02:45:42 PM »
- David

Offline darozas

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Re: Mavic Build - iRazoR
« Reply #12 on: September 07, 2017, 02:47:37 PM »

Offline iRazoR

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Re: Mavic Build - iRazoR
« Reply #13 on: September 07, 2017, 03:00:20 PM »
I actually think it just looks massive. From the dimensions it isn't bigger then the normal Unlocked M8n combos I found. I will definitely take the cover of and I think there is quite a lot of air inside. The board itself isn't that big I think but I didn't really found pictures or something from the inside. I will keep you updated
- David

Offline darozas

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Re: Mavic Build - iRazoR
« Reply #14 on: September 07, 2017, 03:35:16 PM »
How big is the board dimension vise? Width height exectra

Regards