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sofly
89
Nov 28, 2014
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This is crazy expensive for a tiny nano copter that seems to just be for learning or playing. I recently purchased the Hubsan x4 for around $40 which also comes with a controller and charger. I get about 20 minutes of flying time out of it, and it's been great for learning and toying around with a cheap quad. I'd recommend it highly, even just to fly around the house. Can't imagine how this is any superior unless you are a dev and really want to just toy around with the software side of this without having to think about hardware.
Nov 28, 2014
SuperBobKing
145
Nov 29, 2014
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For one thing this is a 10 axis quad copter and that one is only six axis.
Nov 29, 2014
slaithe
14
Nov 30, 2014
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And what difference does 6 v 10 axis make?
i thought there are only 4 axis... x,y, z, and time.... Guessing you could add rotational axis's and call it any thing you want [of course]... just don't see how it relates to this kit being better and worth so much more then any other quadracopter learning kit....
so correct me if I'm wrong but your basically saying "because this one can rotate around 4 more interconnecting imaginary lines"?
Nov 30, 2014
SuperBobKing
145
Nov 30, 2014
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I would have to check to be sure, but I am pretty sure the extra 4 axes are for telemetry like an accelerometer (it mentions those things when saying that it is 10 axis, but doesn't say that they are axes). If this is the same thing I saw on kick-starter awhile back (I am pretty sure it is) this is a development platform, not just an rc quadcopter. If all you want to do is fly something around this is overkill.
Nov 30, 2014
Bjornsk
2
Dec 3, 2014
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generally when talking about 6 degrees of freedom [DoF] (or "axis" if I understand you correctly) it implies translation (x,y,z) and orientation (yaw,pitch,roll), these can also sometimes be referred to as the 6 "states" of the object, For a simple overview have a look at http://en.wikipedia.org/wiki/Six_degrees_of_freedom . Time is not usually considered an axis in this field but is incorporated in the derivatives of the states (velocity and acceleration).
It does however seem as if the manufacturer has made a somewhat liberal/unconventional interpretation of DoF and relate it to the output of the sensors; accelerometer, gyroscope, magnetometer (these 3 sensors all measure in 3 dimensions) and barometer. This might not from a technical standpoint be wrong but it is a said unusual to do it in this manor.
Hope you got some clarity from this answer :)
Dec 3, 2014
Gibbsey
2
Dec 3, 2014
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When it comes to DOF it seems the industry standard to list sensors like this:
6 dof: 3 axis Gyroscope, 3 axis accelerometer (yaw/pitch/roll: speed and stabalization) 9 dof: adds 3 axis magnetometer (compass to find orientation) 10 dof: adds Barometer (altitude) 11 dof: adds GPS (location)
this is not something limited to just crazyflie
Dec 3, 2014
StormTrooper
46
Dec 5, 2014
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I'd actually say it is fairly common. Head tracking does the same. A lot of trackers(including the one in the Rift) claim 9DOF because they add up the sensors, even if they report the same axis. So if there is an accelerometer, gyroscope, and magnetometer all measuring rotatation, they'd call it 9DOF, even though it is really three. It's a misnomer, but they do it all the time.
Dec 5, 2014
tiangou
14
Dec 31, 2014
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This is a dev kit. You're exactly right. If you want a toy, get a Husban. If you want an entirely open sourced and open hardware hacking kit... Well, this is it.
Dec 31, 2014
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