What is a Headless Mode Drone?

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Post on March 04,2015 00:16#1

What is a Headless Mode Drone?

1. What is Headless Mode?

Anyone who has played a drone had such experience: you wanna fly your drone to left but it goes to right.


Every drone has a front and a rear.

When you are facing your drone rear, the transmitter and your drone front are in the same direction.

When you pull the transmitter stick to left, your drone will go to left.

But when your drone turns around and its front is facing you, the transmitter and your drone front are in the opposite direction.

That`s to say, when you pull the transmitter stick to left, your drone will go to right.

And sometimes it`s hard to tell between the front and the rear.

To solve this problem, many drone manufacturers design different-color propellers for their drones, such as, white propellers for the front and black for the rear.

Some even have different-color LED to help players tell front from rear.

However, as your drone is a certain distance away from you, it is virtually difficult to tell between the colors, which again poses the problem of orientation.

Headless mode is a good way that allows you not to worry about orientation altogether, since there is no difference between front and rear for a headless drone.

2.How Does Headless Mode Work?
It`s really simple.

When you choose a headless mode, your drone will go to left when you pull the left transmitter stick and go to right when you pull the right all the time, regardless where your drone is pointing at.

3.Should I Buy a Headless Mode Drone?
For beginner: it`s good to play a headless mode drone since it`s more convenient to control the drone and avoid crash it because of mis-operation.

If you’re just looking for some fun with your drone, headless mode provides easy operation and less damage to your drone.

For professional: if you plan to be a drone master, I recommend you to play a non-headless mode drone.

That’s because most drones that do offer headless mode are toy grade, whereas the more serious drones normally don’t have the headless mode function.

For taking a video: I`d recommend a headless mode drone for those who use their drones for taking videos.

You do not have to worry about the direction and you could change your drone`s directions as you like while taking a nice video.

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Post on March 04,2015 01:01#2
Good Info, yes truly i recommend the headless mode quadcopter for beginners
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Post on April 17,2015 18:34#3
This one looks so awesome.. :)
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Post on May 30,2017 03:06#4

hello there. i would like to know if the headless mode is working on 360 degreees or just 180 degrees?many thanks

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Post on June 01,2017 03:50#5
Great... question.
And needs an answer. Ok let's try, but you'd not like it very likely, because it would be slightly different from expected "short and clear choice from two options offered".

Imagine as if you are the copter.
And you need to always know where is "there". To keep in your mind that exact direction.
How can you do it? Oh so easy: you see where is "there"... but oops - you have no eyes to see. You are the copter, not a human.
Ok, what else can you have to rely on...
... let's remember: sometimes humans are using compass to know the direction. Relying on the planet Earth magnetic field.
And happily copters are able to do the same: to rely on the planet Earth magnetic field. By a special electronic part, called "magnetometer" or just "compass" (google MEMS by the way).
If you have such thing onboard - then the whole task is solved, you always know where is "there". But please don't forget about calibration, magnetic inclination and so on (just google). And keep in mind that any magnetic field near your compass will be rather strong, compared with the common magnetic field of the planet Earth: your own motors and high current wires, power line at the place where you want to fly, or just a piece of metal near your compass...

Imagine you're the inexpensive copter. And/or you are microcopter, small and easy as possible. Doesn't matter...
... just the engineer has decided, that you don't need a compass. And you have no it, really.
But you still need to know: where is "there".
But you have absolutely nothing outside yourself to rely on. All you have: the only yourself.
Any ideas?
And here the magic starts. I know you believe in magic, seriously - nothing but a pure magic.

You (as the copter, you are still it, just to remind) know your accelerations, separately each axis: three linear X, Y, Z (accelerometer) + three rotational YAW, PITCH, ROLL (gyro) = six axes total. It is done by the same in general MEMS technology, which you have googled already for compass.
But please do not confuse, acceleration is not just another way to say "speed"! Acceleration is the speed of changing speed.
And the magic is:
1) know the speed of changing your speed at the end of each second starting from the very start, sum it all - and voila! you know the exact speed right now, for each of six axis. It was the first integration.
2) know your speed at the end of each second starting from the very start, sum it all - and voila! you know the exact position. It was the second integration.
Perfect, isn't? Who needs a compass....

... oops, the perfect is not perfect.
Let's sum our accelerations at the ends of three seconds, for example: 4,028468898 + 2,903490829 + 110,140297423 = 117,07225715 is our speed in result.
But the real values are never "exactly rounded"!!! But your CPU can't deal with values of an endless accuracy, it needs them to be rounded before summing.
Well let's sum the same values rounded: 4 + 2 + 110 = 116... noticed the difference? Well let's use another method to round: 4 + 3 + 110 =117, result is different anyway. But it was only the first integration, to calculate your speed.
And only the second integration will give you your position. With "rounding error" quickly accumulated, more and more each next second.
So you get more or less random result finally. I.e. you will suppose where should be "there", but you will not know surely where is it in fact.

And that is exactly what you have with a copter without a compass: it supposes where is the wanted direction.
But it doesn't know where is it in fact, and its supposition can be not just wrong - it tends to become completely random finally. More and more error each next second. Especially with active uneven movements via each of six axis.

And what was the question? Don't bother, really - just try to fly without all this confusing shit. By own hands, eyes* and mind.
Hello there.

* what do you think about FPV, by the way?
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Post on June 01,2017 05:55#6
this is the best explanation aof  a headless drone
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