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Hello. In this video tutorial I

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am going to show you how to

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use a servo motor this type of

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motor that you can see here it's

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not the usual type of motor that

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keeps turning and turning it works in

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a slightly different

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way

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so using one command block like this

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one

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to turn the servo by a certain

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amount of degrees we can send a

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command to the motor this one that

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is connected to pin ten

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and the command instead of continuously turning

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is saying here that the servo has

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to place itself in position at zero

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degrees

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so for instance here the motor is already

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in zero degrees it starts there on

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zero so the servo is connected with

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this green wire on the left side

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and it's in pin number ten but

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it could be eleven nine whichever you

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prefer and there are also two other

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connectors the red

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one the one in the middle is

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connected to the power source

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and the one on the right the

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black like always is connected to ground

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so here we have an extra component

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we haven't used before this is the

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power supply the servo motor you'll find

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here in the basic library but if

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you look for the power source you

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can't find it here so you will

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have to look in the standard library

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that contains all of the components listed

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and just keep scrolling down until you

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find it

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here yet here you have the power

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source and the reason that we need

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a power source is that the arduino

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board here can't provide enough energy to

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the servo motor and just as a

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reminder don't forget the arduino board also

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needs to have the ground connection the

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ground of the arduino

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is connected to the ground of the

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motor and the ground of the power

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source this way the three of them

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will have a common point of reference

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this is also their reference of voltage

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so yes it is the way that

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we close the circuit and that is

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important but it's also a common point

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of reference for voltage

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so now I have briefly explained why

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the red wire is connected here and

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why the black wire is connected here

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because the power to move the servo

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is going to be provided by the

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power source so now I will explain

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the program that you will have to

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create but I'm not going to show

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you the code I'm just going to

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show you how the program should behave

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and you will code it

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so let's start the simulations you can

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see so the program starts here at

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zero degrees and it will keep turning

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and turning because our code will send

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commands to make the motor rotate to

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different positions

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so we start in zero degrees and

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we move up or it looks like

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to the left

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and then once once we reach ninety

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degrees we start moving down or back

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to the right

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but down in degrees ninety eighty five

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eighty and so on until we finish

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back in zero degrees again

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and this over here is the intensity

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that is being read and the intensity

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provided by the power source and then

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the moment we arrive back to zero

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degrees it doesn't move anymore and the

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program stops

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so the first thing you need to

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do is connect the circuit this way

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with the arduino board the servo and

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the power source

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I hope you understand now why the

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power source is needed and of course

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you have the blocks for the code

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and I'm just going to show you

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the main idea instead of the whole

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thing so the first thing we need

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is a block like this one with

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this block you're saying that the servo

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is connected to number ten and it's

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going to start at zero degrees we

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always need to start somewhere so we

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need to be sure that our servo

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will start at zero otherwise we don't

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know where it will be

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it could be in forty five or

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fifty or thirty degrees

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so the first command is always starting

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at zero degrees

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and then we will have to wait

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for instance one second every time we

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make the servo turn we always need

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to wait to give the servo time

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to move

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so this is the first part of

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the code and then there will be

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a second part that will look something

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like that

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now this part is taken from the

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previous exercise

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and this is not what we are

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going to use to move the servo

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but it's going to be really similar

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to the first time you move upwards

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you will for instance turn or jump

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every five degrees from zero to ninety

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remember this from the simulation that you've

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already seen

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and then you will send the order

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to move and again we will use

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a variable the same way we use

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the variable to send a frequency to

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the buzzer we will use a variable

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to send an angle with degrees to

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the servo and then again we'll have

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to wait for a certain amount of

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time

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so this one will be the second

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part of the program and there will

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be a third part really similar to

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the second one but instead of moving

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upwards with degrees we will move downwards

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again jumping every five degrees from ninety

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to zero and again we'll send commands

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to the server to this

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servo using a variable for the angle

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and then every time we make it

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move we will wait for one second

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so this is the program you will

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need the first part then something similar

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to this one for the second part

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and something similar to that for the

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third part and if you program it

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properly it will behave the same

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the way you have seen in the

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simulation okay so it shouldn't be too

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difficult but just make sure to follow

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these instructions with this structure okay good

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luck