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450mm quad build


(Igor Vereninov) #1

Hello friends!

Recently I have assembled a 450mm quad for flight testing Navio+ and APM code. I thought it would be a great idea to share the build with full part list and desription. I hope that this thread will help beginners get in the air faster.

Here is a picture from maiden flight.

##Shopping list:##
Q450 Quadcopter Frame 450mm $12.55
Q Brain 4 x 20A ESC $29.92
Multistar 2212 combo, set of 2 2 x $23.99
ZIPPY Flightmax 3000mAh 3S1P 20C 2 x $14.65
Navio+ $168
Power module $24
Raspberry Pi 2 $35
GNSS antenna $12
Zip ties $2.33
Battery strap $2.11
GPS Antenna pole $4.96
Male to male servo leads $1.80
Gyro mounting pad $2.39
Wi-Fi Dongle $5

Total: $335.39

Also a radio and a PPM capable receiver. We will use Futaba T8FG and FRSky TFR4 Rx (about $400), but if you are just starting Taranis ($220) is a very common choice.

##Tools##
Snap knife $0.17
Soldering station $15.99
Solder wire $1.56
Hex screwdriver set $6.99
Wire cutters $1.69

Total tools: $26.4

Here is a list of what you will need to accomplish this build, feel free correct me as I probably missed something. Also, would be great to see simultaneous builds, so hop on :smile:

###To be continued…###


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[Help!] About materials we need
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(Nathan Powell) #2

Next time you get it apart can I see the under side of the top plate (how you mounted it)? I’m just using servo tape for my 550 and it’s a bit sketchy lol


(Josue Gonzalez) #3

Hello Igor!

That´s a great build! It flew as expected?

A couple of weeks ago I assembled a F550 hexacopter using Navio+ autopilot and APM firmware. It flew well enough by RC but unfortunately when I tried to use the APM Planner it went completely wrong, It crashed and the main frame got damaged.

I´m now waiting for the spares arriving to continue testing this autopilot.

I will be glad to share my build once it works!


(Pedro Alves) #4

@JosueGlz

Hi, I’m glad to see that you’re using my NAVIO case design :smile:
Can you share some feedback? If you like the design, what you want to see improved, all the feedback are welcome. I’ve made some modifications that I’ll share on thingiverse on next week.

Regards


(Josue Gonzalez) #5

@Pedro_Alves1

Hi Pedro, this Navio case is awesome! I found it on thingiverse and I totally loved it. The RPi + Navio fits perfectly. I had some troubles when assembling, the upper part didn’t fit on the lower, but probably because of the quality of the 3D printer. I just removed some material and now it fits perfectly!

Thank you for sharing it,


(Igor Vereninov) #6

##Wiring the ESCs and motors

Usually wiring motors to the ESC is fairly straightforward: connect three wires between them, black an red wires go to the battery and servo plug is connected to Navio+ for control.

In this project I am using a 4-in-1 Qbrain ESC, which packs 4 ESCs and makes for easier wiring. For a quad it eliminates any need in a PDB (power distribution board).

I really enjoy clean wiring and have decided to remove the cables that come with Qbrain. Motors have wires long enough to connect directly to the ESC. After I have desoldered the wires, connectors from them were removed and soldered directly to the PCB. Please note the insulating tape on top of the connectors. It is there to protect them from shorting when putting the ESC lid back.

Power from the battery does not go directly to the ESC, but rather passes through the power module. This will let us see voltage and current values in the GCS.

Here you can see how wires are attached with zip ties to the arms. Make sure that everything is properly fixed and will not fall off in flight.


[Help!] About materials we need
(J) #7

@jet_flyer

use this is works like so well:

http://www.readymaderc.com/store/index.php?main_page=product_info&cPath=11_15&products_id=1305

you will need to add some adhesive to the other side. I use 3M 467MP, its semi permanent and holds up well against heat and vibes. i use this stuff all the time on my builds.


(J) #8

@JosueGlz, I have the same frame and it is flying very well after pid tuning, trim, mid throttle, balance, etc.

If you want we can discuss in my 550 project post. I don’t want to clutter up this informative thread…


(Jerry) #9

@igor.vereninov I having a little trouble understanding the final connections between the battery, navio+ and the receiver. Some of the connections are obvious, but I am not seeing what the wire from the battery (yellow, red, blue, and black) is connected to. I also don’t quite understand the connection to the receiver and the navio+. You seem to have more wires connected then I have present. I am using the Taranis -plus transmitter and the x8r receiver.


(Jason Youn) #10

It seems like you are using a 3C battery. Those extra wires from the battery are for balance charging. If your charger supports balance charging, you plug them in to the charger. Mid flight, you will most likely use it for low-voltage alarm. As for the receiver setup, you should only have one set of wire (ground, pwr, signal) coming from the receiver. Guessing by you saying

I think you’re mentioning the ESC control wires connected to the Navio+. Photo of your setup might help.


(Jerry) #11

@jasonyoun thanks. I will give it a try on tomorrow. The photo of the setup just seems to have a lot more wires than I have present. I wire everything tomorrow and send a photo.


(Jerry) #12

@jasonyoun and @igor.vereninov

I using the following transmitter and receiver: [Taranis][1]

However, I am not understanding how to connect the receiver to the navio+

These two images show how I currently have the receiver connected.

[1]: http://hobbyking.com/hobbyking/store/_67753__FrSky_2_4GHz_ACCST_TARANIS_X9D_PLUS_and_X8R_Combo_Digital_Telemetry_Radio_System_Mode_1.html “Taranis”


(Sebastian) #13

On the servo rail the ground pin is at the edge of the board and the signal pin is the innermost. You connected RX and ESCs the wrong way around.
But you will need a SBUS to PPM converter for the x8r receiver.
http://www.frsky-rc.com/product/pro.php?pro_id=112


(Nathan Belk) #14

I love this thread! Because of it I went and changed a lot on my own quad, like the frame and esc.

I do have a question though for you. Did you calibrate the Q-brain in anyways? And if so, can you describe the procedure? The instructions say to calibrate it to the controller but do I need to do this with the ESC getting the signals through the Navio+?


(Igor Vereninov) #15

Yes, I have performed the calibration. Actually I sequentially plugged each channel into ch3 on the receiver and calibrated them one by one. For me it looked like the fastest way to do it. It is not compulsory to calibrate them through Navio+.


(Baumgartner) #16

Q Brain , has a Th Hub (sold with the ESC, no need to buy), you can do 4 ESCs calibration at same time, one shot.

plug 4 wires in this hub, and one wire into ch3, easy


(Igor Vereninov) #17

Good catch! I completely forgot that I used it last time for calibration, really convenient.


(Baumgartner) #18

Yes,
I did like this a long time ago….works….
But I really recommend (with all hw already assembled):

  1. Put the throttle stick in “high” position…. Turn on the Navio+ (multirotor), wait the software loads.

  2. Turn off the Navio+ with de stick still in “high” position, after software load… put stick in “low” position, you will hear the sound of all ESCs……

Will work very well for Q Brain.

All EScs will “sinc” together , much better…
The best is sinc the escs with the hub (or one by one), and this procedure too.

Bulet proof…


(Nathan Belk) #19

I’ve been having problems with my QBrain. I was able to calibrate it (using the hub) but now when I arm it, it spins pretty fast, and when I give it just a tiny bit of throttle, it acts as if it jumps to full throttle (since I don’t have propellers on it, its hard to tell just how high of throttle it is running at). Right after ESC calibration mode, when the navio is sending the signal straight to the ESC, it works normally.

I used the hub instead of the method robertb mentions because I couldn’t get my Navio to go into ESC calibration mode. When trying to fix this throttle problem, I saw that my navio/apm/mission planner was defaulting to an ESC setting of 0, which means it would never go into ESC calibration mode, even if the throttle was high. I switched that and was able to observe the proper behavior.


(Baumgartner) #20

Nathan,
Really strange…

For Navio+ you have to wait a little more between the steps, because the APM start-up is a little slow.

Have a look in Randy’s video…. Are you following these steps?

I strong recommend do this procedure (all ESCs) after any change in your hardware setup, or first install.