Arduino #9 - Servo Selection & Motion Control Video Lecture | Drones for Beginners: How to make Arduino Drones - Electronics and Communication Engineering (ECE)

how's it going guys a lot here and
welcome to the 9th are doing a tutorial
in which we're going to be talking about
servos what the benefits are what you
can do with them what usually comes in a
standard sort of package how you can
program them what's a good way to wire
them etc so without any further delay
let's get started you have a lot of
options when it comes to servos so when
you go for the very inexpensive servos
what you have to watch out for is the
plastic gearing inside so those are
typically going to wear off much quicker
than the metal gear ones so as you can
see I have the mg 995 that I'm going to
be showcasing in this video generally
your kit is going to come with the servo
itself you're going to get a screw which
will be used to hold down one of these
knobs and generally the kit comes with
one or more of of these rotating heads
if you want to call them that so you
want to do is first of all pop them on
your servo and you can obviously change
it afterwards if you don't like it's 0
to 180 degree sweep because you can
obviously mechanically offset it to
whatever you wish and you're going to
set in your screw like so and you would
be ready to get started with the
programming of your servo so what you
also need to know is the general
colouring of your wires so the red one
is I want to say always the plus 5 or
plus whatever voltage you're using brown
is generally the ground and orange is
your signal bus so this is going to
dictate how you're going to hook it up
to the Arduino and just quickly over
doing why you would need a servo for so
the server itself has a control system
which would dictate the position of the
arm what that means is what that means
for you essentially is that it's going
to be a precise position versus a DC
motor which is just going to rotate and
unless you place an encoder and do some
kind of processing on that you're not
going to really know what the position
is so you would use these if you have
any kind of an arm if you have if you
want to have linear motion if you have
if you want to implement a sort of a
piston if you want to call it that
so anything that requires you to have a
movement which would be predetermined
essentially you can use it on RC planes
RC cars you can use it on a robot to
essentially pivot a camera which would
be or a sensor which would use to kappa
capture the obstacles in front of the
robot and many other applications where
you essentially need a precision type of
a rotation so let's take a look at how
we hook it up and then program this
device so in order to hook up the server
is necessary for me to use male-to-male
of wires since both of the servo and the
Arduino have female plugs so the signal
bus generally connects to a PWM and
unless you want to simulate that in
software you're going to have to use
essentially pin 11 10 9 6 5 or 3 so in
my case I'm going to put it into nine
I'm going to also plug in the ground and
the power buses onto the Arduino and
that's your basic setup this doesn't do
any noise can't cancellation whatsoever
this doesn't really turn the servo on or
off necessarily just keep sending it a
signal and it's going to maintain the
control loop of the servo on so let's
take a look at the basic controls that
we can do with the servo so Arduino
native licken contains a ceremony ivory
which
we'll include in your project you'll
create a servo element called servo one
in my case in the setup you can set up
the pen on which your service plug then
in my case it's pin nine and I'm going
to write a 180 degrees position to my
servo which is going to put it to one of
the limits so you can write 180 or a
zero and my loop is currently empty so
let's take a look at what the servo does
in this case let's verify the program
upload it to the servo let's take a look
so let's take a look at what the servo
does as soon as I upload the program we
just created
so I press upload and as you can see
it's at its 180 degrees position so a
few things you're going to notice first
of all this knob is slightly offset as
you can see it's not perpendicular to
the servo or if you wish it to be
parallel to the servo so what you have
to do is as I mentioned before this is
just something you have to live with
because that's a mechanical positioning
so as soon as you know that your servo
is in your is set in your 180 position
what you want to do is take this knob
and position it as best you can into the
position you desire so that's going to
be done like so
I'm going to just put this back in
really quick so now what this tells me
is that when I write 180 in the software
the servo is going to stay in this
position another thing you're going to
notice or maybe not that while on camera
but the server it's currently generating
every so slightly so I can hold it in my
hand and very well fill a vibration and
sometimes it makes a light sound so what
that is is the control system inside the
servo so it's constantly polling the
position versus what position you sent
it and it's trying to readjust itself so
if you were to force your servo or you
have a you have something that's kind of
this balancing the servo it's trying to
get back into its original position so
what that case is that light jittering
so there's a lot of solutions on the web
which provide troubleshooting guides for
how to eliminate that you can plug in
capacitor circuits you can plug in
inductive circuits personally I think
the best way would be to just cut off
the power of your servo when you're not
using it so you can do that with a
simple transistor and I'm going to
discuss that circuit in the later video
as well but let's get back into the
programming and implement a full sweep
of the servo to actually see it go from
180 to zero and K so I've modified my
program ever so slightly as you can see
I've created an integer with the
position which is going to be storing
the current position that I'm sending to
the servo in my loop I have two for
loops one of which sweeps the servo from
position 0 to position 180 in a 1
increments and the other one goes down
from 180 all the way to 1 so within
those 4 loops
I write the position and I have a delay
of 10 milliseconds simply to wait for
the servo servos mechanical motion to
so you catch on to the position so very
straightforward where you going from
zero to 180 and then from 180 back to
the original position and it's going to
repeat this motion over and over again
so let's verify the sketch upload it and
take a look so as you can see the server
is currently sweeping the 0 to 180
degrees positions in a very little
increments through this software and of
what you want to notice is that the knob
is always parallel to the servo in the
two extreme positions of being 0 and 180
degrees and this was something I wanted
to achieve through the repositioning of
knob through the mechanical screw what
you want to notice is that it's
extremely simple to get started with a
servo you don't really need much it's a
very basic connection Arduino provides
you with the library so you should be
all set and ready to go if you want to
use this in some of your projects so let
me know if you have any comments suggest
suggestions or if you have any questions
related to the servo as I mentioned
before I would like to research a bit
more about some of the jetting of
problems that people have and show you
some of my own implemented solutions so
stay tuned subscribe and once again
thank you for watching bye