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Old 10-01-2012, 10:07 PM   #1
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Default MTnet Builds Flying Machines: Failure Accomplished

Hai gayz

Most of you are geeks with internet access, so you probably already know what a multi-rotor/quad-copter is. If you dont, its basically a RC helicopter with multiple rotors and an on board control system to keep the craft stable by controlling the motors individually. Theyre all over youtube and such.

So I decided to buy a heap of chinese parts. Im going to put them together into a simple, small quadcopter. I will then probably smash it into the ground a bunch and have to rebuild it. But whatever, I aint even scared, yo.

Ive got all the basic parts:
  • A control board, which has an ATMega 328PA, 3 gyros, and a few potentiometers for adjusting gain. In particular it is a "KK v5.5" which is a variant of a commonly used board, so theres lots of firmware available to get started with.
  • x4 EMAX 2822 1200 kV brushless motors
  • x4 30A brushless motor controllers
  • Some 10 x 4.5 props, both normal and counter rotating
  • 8 channel 2.4 Ghz Transmitter and receiver
  • 2650 mAh LiPo battery and cheap battery alarm/volt meter

My goals are to first get my feet wet with flying one of these things, then get into programming the stability board. Eventually I want to build my own board with a barometer and GPS. Most likely still based on an ATMega.
Then I want to get a 5.8 Ghz transmitter/receiver and set up FPV video with a little board camera I have.
Id also like to build a bigger one so I can fly my DSLR around and take sexy aerial video of ****. This is probably a long ways off.

So far all Ive done is made a frame. Im figuring out how Im going to mount everything, at which point Ill post videos of me flying it into the ground and crying.

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Old 10-01-2012, 10:10 PM   #2
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Subscribed for failure.

How much has this cost you so far?
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Old 10-01-2012, 10:29 PM   #3
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Im new to the RC hobby, so I had to buy some of the foundation stuff, like a transmitter and battery charger.

I spent $75 bucks on a FS-TH9X, which is a cheap and awesome transmitter with a lot of mod support. Its pretty bare bones but you can put different firmwareon it and a backlight for the LCD, which makes it just like the transmitters that cost 3 times as much.
I bought a LiPo charger that can run on 120 in addition to being DC in, so I could have saved a bit by going for a straight up DC charger. I spent 60 on my charger, could have gotten away with only spending 40.

The ebay parts for the quad (motors, ESCs, the control board, props, etc.) came to about $120, plus a bit of stupidly expensive Home Depot aluminum.
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Old 10-01-2012, 10:35 PM   #4
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That's not bad. My parents bought me a 4' Nitro ARF fixed wing for my 16th birthday for $350 IIRC. I assembled it quickly, then after sitting for 8 years, I decided to fly it. On it's maiden flight, I set the aileron 'polarity' incorrectly, and it went up, then promptly barrel-rolled into the ground into a million pieces. Total destruction.

Now I want to make some cheap park flyer or something. This could be a good choice.
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Old 10-01-2012, 10:40 PM   #5
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Tw34k and I have been building little park flyers out of dollar tree foam board and destroying them.

You should check out the "Flitetest" channel on youtube, its a couple of butt buddies that build little planes and give tips to noobs like me.



We built a couple of these little "nutballs" to try to learn to fly, but we used too big of a motor and they were borderline impossible to fly.
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Old 10-02-2012, 01:44 AM   #6
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in for failure
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Old 10-02-2012, 01:46 AM   #7
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That's a good watch! I need to start doing this stuff.
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Old 10-02-2012, 11:55 PM   #8
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Mounted the motors:



Super baller lime green zip-ties:



Propellers couldnt get any closer to each other:

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Old 10-03-2012, 12:55 AM   #9
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Using bolts not zip ties I suppose?
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Old 10-03-2012, 06:25 AM   #10
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Are you not worried about the weight distribution between propellers or is it insignificant with a quad motor setup?
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Old 10-03-2012, 06:38 AM   #11
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Subbed, this shall be fun.
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Old 10-03-2012, 09:11 AM   #12
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Old 10-03-2012, 01:26 PM   #13
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Quote:
Originally Posted by Bond View Post
Using bolts not zip ties I suppose?
I may try nylon bolts. I basically have to make the motors "break away" to protect the motor mounts in the event of a crash.

Quote:
Originally Posted by UrbanSoot View Post
Are you not worried about the weight distribution between propellers or is it insignificant with a quad motor setup?
It will have to be pretty well balanced. If it is natively off balance for some reason I can compensate by where I mount the battery.

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Subbed, this shall be fun.
Im expecting some funny video to come of it, haha

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Old 10-03-2012, 11:26 PM   #14
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Took the heat shrink off one of my ESCs (Electronic Speed Controller). I'm soldering different wires to the board and I also am thinking about flashing different firmware to them. They put code into them for airplane use, like soft starting and stall ****. It doesn't effect how they act very much, but the micro is still having to go through the code as it loops, so it slows down how fast it responds. By putting multi-rotor firmware on them I should be able to get some better performance, both in stability and how agile it will be.





No surprise that it has an ATMega chip on it. Unfortunately no pads or header to attach wires to for in circuit serial programming. So its going to be a pain in the *** if I dont have one of these:





That little thing costs 20 bucks, ships out of china, and is back-ordered... so Its going to have to wait.
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Old 10-03-2012, 11:33 PM   #15
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Also, this:

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Old 10-04-2012, 12:40 AM   #16
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omg you are a huge nerd, hahahahahaa

but this is kinda cool tho. you need to figure out how to attach a good exhaust system so it's loud and gets the bitches moist.
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Old 10-04-2012, 07:02 AM   #17
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This thing looks like a really cool nerdy project.
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Old 10-04-2012, 09:17 AM   #18
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God I hope you have kids - otherwise you have me scared with that Anime figure in your possession

On another note - you don't think there'll be issues with how close the rotors are to each other? I'm thinking more of air flow/wash - robbing air from each other... but I don't know jack, so....
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Old 10-04-2012, 10:27 AM   #19
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subbed for awesome project
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Old 10-04-2012, 11:23 AM   #20
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I'm with GeneSplicer, just cuz they don't touch doesn't mean they won't interact aerodynamically. Wouldn't it be a lot easy to buy one of the prebuilt quads, last I looked they were pretty expensive, but still.

Also, it'd be pretty rad to be have one with GPS and set a preprogrammed flight path that basically had it take off and hover 100 ft over an autocross course for a minute so you could get a top down video of runs and check your lines... There's prolly ppl out there that'd spend $1000 for something that could do that.
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