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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.


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Comment (24)

  1. i want the servo to start with the attachment up and down or side to side(depending on witch way you look at the servo) and turn to the right ( so the top plastic peice is to the right) and then go back to the side to side prositon, how would i do that?

  2. Nice video , what power supply did you use and do you recommend any power supply that I should use.

  3. Thank it was very helpful.
    I have a servo which can turn 360. what should be the code to turn it 360 continuously?

    1. I think you can use Servo.write(0) and Servo.write(360). Also assign the lower and upper limits of the servo depending on your project

  4. How can I replicate a hold with the servo? Like I want it to press on a touchscreen with a stylus but I wasn’t it to hold it there for 3 seconds then retract? Thanks!


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