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Old Feb 18, 2013, 05:36 PM
Mmmmmmm!
WiseDuck's Avatar
Kingdom of Sweden, Dalarna County, Sater
Joined Oct 2011
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Unfortunately, those props are too large for my frame.. Thanks for the suggestion anyway. Either way, the motors don't run particularly well which is a bummer. I suppose the cogging could be a timing issue, but why on one motor and not the other? I might give it another go before I take it apart. I guess the motors and ESCs can be used on micro planes or something.

Oh and I got my Tarot FBL controller today. Which I then ruined with a reversed UBEC connector. So yeah, kinda bummed out right now. Screw this Monday, seriously .
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Old Feb 18, 2013, 05:39 PM
DiaLFonZo - UAV/Drone
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Canada, QC
Joined Oct 2007
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Might be bad magnet glue in the bell.
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Old Feb 18, 2013, 05:50 PM
Stop me before I build again!
United States, NY, Albany
Joined Sep 2012
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My few attempts at smaller birds the motors are a big problem. At the RPM I'm spinning even the slightest vibrations seem to eat right through the motor wires and cause the units to fail eventually. It just sucks that they can't seem to fix the issue already.
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Old Feb 23, 2013, 06:53 AM
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Roosendaal, Netherlands
Joined Dec 2004
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I guess im back on the wagon again.

Motor + ESC test for Hubsan X4.5 (0 min 20 sec)


Its just a brushed motor, but with a bit of luck I can spoon it all into one of those hubsan X4 bodies.
I'll have the first naze32 barometer equipped hubsan x4.

So this : http://www.ebay.com/itm/Original-Bra...item5d3a41749a
plus http://www.ebay.com/itm/Hubsan-X4-Mi...item19d8c4b1db
plus http://hobbyking.com/hobbyking/store...dProduct=11885
plus that afromini controller and a stripped assan PPM receiver should get me across the line.
I hope I can find something that can indicate low voltage though, or ill be flying without battery protection.
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Old Feb 23, 2013, 07:20 AM
Stop me before I build again!
United States, NY, Albany
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http://code.google.com/p/q-axis/wiki/BrushedMotors

I wonder if a small 328p based board, code changes, and the requisite drivers would provide a cleaner build.
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Old Feb 23, 2013, 07:21 AM
Stop me before I build again!
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Quote:
Originally Posted by Freakazoid View Post
I hope I can find something that can indicate low voltage though, or ill be flying without battery protection.
The ESC seems to indicate lipo protection.
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Old Feb 23, 2013, 09:20 AM
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Quote:
Originally Posted by brontide View Post
http://code.google.com/p/q-axis/wiki/BrushedMotors

I wonder if a small 328p based board, code changes, and the requisite drivers would provide a cleaner build.
Not sure what you mean. Multiwii can drive FETs directly somehow?

Quote:
Originally Posted by brontide View Post
The ESC seems to indicate lipo protection.
Just cutting the motors isnt an indication though, its a measure.
Id like a LED to light up when its time to land, but it seems to get pretty lumpy without an SMD circuitboard.
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Old Feb 23, 2013, 09:53 AM
DiaLFonZo - UAV/Drone
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Quote:
Originally Posted by Freakazoid View Post
Not sure what you mean. Multiwii can drive FETs directly somehow?

Just cutting the motors isnt an indication though, its a measure.
Id like a LED to light up when its time to land, but it seems to get pretty lumpy without an SMD circuitboard.
Yes it can drive fet direcly for BRUSHED version since it's only an analog output variation.
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Old Feb 23, 2013, 10:33 AM
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Hmm would it be any smaller than this ESC already is? Would certainly be cheaper.
Can it be done with an SMT32 based board though?
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Old Feb 23, 2013, 11:11 AM
Stop me before I build again!
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Quote:
Originally Posted by Freakazoid View Post
Hmm would it be any smaller than this ESC already is? Would certainly be cheaper.
Can it be done with an SMT32 based board though?
In theory if 4 of the outputs are analog rather than digital lines. You would then need to modify the baseflight software to drive the analog lines.
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Old Feb 23, 2013, 11:31 AM
Mmmmmmm!
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I'll let you figure this one out. I'll just keep an eye on this project from over here. I still want a mini FPV platform, something that doesn't have an abysmal range.
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Old Feb 23, 2013, 12:36 PM
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After a bit of poking around I believe this isn't all going to fit inside the hubsan body.
Not unless I hang the battery outside, which kinda ruins the charm anyway..
Length and width will fit, but it might be getting a little too fat to have the ESCs inside as well.
I suppose they could be shrinktubed to the legs, but that would likely end with them going all over the place.

So I turned to some photoshopping again, came up with a micro TBS kinda deal.
What Id like to do is cut out two H-shaped frames, 16mm wide in the middle, 10mm wide on the arms,
with a triangle gauntry design cut out of them to save some weight.
Then mount one ontop of the other with nylon spacers in between, two in the middle (close to front and back of controller),
and one next to where each motor will be (makes it easy to ziptie them down!)
This would leave a nice little space upfront for one of those 1gram nanocams,
and space in the back for one of those stamp sized 5.8GHz video transmitters.
Not sure if I can get away with this due to the weight of it all though..
Red bits in the picture are the ESCs, green bit the RX/controller stack.
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Old Feb 24, 2013, 08:21 AM
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Slightly enhanced drawing.
Since the whole thing is barely 100mm in size, I chose to skip the center spacers,
but on each arm there is one 10mm high spacer, which will aid in mounting the motors.
My plan is to stack 2 of these plates ontop of one another, and slip everything in between,
maybe use some tape/shrinktube after its all done to spruce things up a bit.

The red block front center is a 10x10mm nanocam, the purple infront of it represents the 120' FOV.
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Old Mar 07, 2013, 10:21 AM
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Just for fun, and to visualize a bit better what ill end up with,
here's a little doodle I made while waiting for the parts to come in.

Some highlights of my plan:
Each arm will have a brushed 1s 3A ESC sitting upright with some stickytape.
The motors will sit in a concave notch, strapped to a nylon standoff (ziptie or rubber O-Ring).
The center section is 20mm wide to accommodate for the 10mW 5.8Ghz vTX in the back.
The afromini board will be stacked ontop of my receiver and both put smack in the middle.
I found a really tiny 1s lipo alarm, the LED of which will poke out the back.
The whole frame will be made of 1mm thick G10 plating, spaced by 10mm tall standoffs.
I'll cut a buncha triangles out of the main body section to save weight.

The hubsan x4 motors seem to have the grunt to do some mild aerobatics,
so hopefully they are ok with heavier frames and just mild FPV hovering too.
If lift capacity allows 3.7grams more, ill bump the battery from 240 to 400mAh.
Ill also do some experimenting with SMD components to see if I can get a miniature noise filter going.

The rundown on weight:
1.3g Receiver
1.7g Afromini FC
0.4g (x4) ESCs
4.0g (x4) Motors
2.0g Camera + 110' Lens
1.2g Video Transmitter
0.1g Lipo alarm
8.1g 240mAh lipo cell

So with all electronics ill be sitting around 35 grams wires included.
According to some mass calculations, the frame will weigh in at about 10 grams.
Several sources suggest the motors are capable of 20 grams of lift each,
so thats a 80 gram capacity, which seems to be cutting it a bit close.
A loaded hubsan is merely 34 grams, mine would come in at about 45 grams.
48 if I want to get a 400mAh battery involved..

So whether or not this thing will actually make for an enjoyable FPV craft,
will be a complete shot in the dark. But I guess we'll see.
Ive seen bigger miracles flying around while they really shouldn't.
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Old Mar 07, 2013, 10:57 AM
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Austria
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Quote:
Originally Posted by brontide View Post
http://code.google.com/p/q-axis/wiki/BrushedMotors

I wonder if a small 328p based board, code changes, and the requisite drivers would provide a cleaner build.


Yes, it is way better to use n-fet and direct driven by cpu pins, then have an ESC in the middle that convert servo signal, back into n-fet PWM driven

AfroMini32 is cool ... but the same could be done ATmega328 based board ... using just these two board: http://www.ebay.com/itm/160944635007 and http://www.ebay.com/itm/181090715183

BTW ... where did you source a 1.3g video transmitter .. what is the range ?

I got a micro 1.2G video transmitter time ago for 15$ on ebay ... but the guy does not sell it anymore ... range is just 10 or 20 meters ...

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