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Hello. In this exercise we're going

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to continue studying how the computer can

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send and receive information from the arduino

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board here on the screen you can

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see the circuit we're going to use

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we have four LED connected to the

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usual connectors

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thirteen twelve eleven and ten we are

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going to use digital outputs and every

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LED is connected to a two hundred

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twenty ohms protection resistor so nothing new

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for the moment we've done that before

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let's go to the code and have

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a look

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this block here read serial monitor is

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a new one this is the purple

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block which means it's from the input

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library and it means that the arduino

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board is reading from the serial connection

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from the wire that is connected from

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the usb that is connected to the

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computer

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so we will have a variable that

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is called

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serial, "serie", because I just want

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to choose a clear name so we

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take the value or the number from

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the usb wire and we store it

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inside the variable and now I'm going

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to use this variable to control the

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arduino board here for instance as an

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example if this variable

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equals one then thirteen will be high

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so it means that the red LED

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will shine so let's have a look

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and start the simulation

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nothing happens while remember that the serial

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monitor is down here and to send

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variables with a number we have to

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type down here in this box

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so if I type one and I

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press enter

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nothing happens because there's a problem

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this block is not the right one

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if you want to read integral numbers

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there's a problem with the

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simulation but it's not a big problem

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we can solve it by changing from

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blocks to text

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now notice that when we want to

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change from blocks to code we will

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not be able to come back to

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the blocks so when we change we

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just have to be certain that that's

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what we want but if it is

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we click continue

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and then here we will have our

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code

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so right here this is the function

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we are using to read serial equals

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this function so here instead of using

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serial read we are going to use

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a new function and type in it's

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called serial

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parse int

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if you have any problem just typing

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in here try it a second or

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a third time because sometimes you can't

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get it to work the first time

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for some reason so keep trying

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so here we have the new code

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I have only changed the function we

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using to read the number and now

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I'm going to start the simulation again

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and now if I send number one

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down here

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the LED shines

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okay that seems really simple so your

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exercise is a little bit more complicated

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than this one you will repeat the

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code remember you can stop the video

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and go back if you need you

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will read the variable the same way

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and you will add several blocks for

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switching all of them on individually

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you will have four numbers to switch

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them on and all four numbers again

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to switch them off

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remember that the serial monitor is here

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okay

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down here so for example you can

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use one two three and four to

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switch them on

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and then maybe you can use five

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six seven and eight to turn them

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off whatever you want these are the

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orders that you're sending through the usb

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if you can instead of repeating the

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blocks you can just copy and paste

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this part here

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this is the part that you can

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duplicate to reproduce the different possibilities

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thirteen is the number of the connector

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here instead of high you can use

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low and one here means the number

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of the code we use to send

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information so you can copy and paste

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this part of the code if you

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want to

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you will have to go back to

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the blocks program a new circuit and

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then create a new code or you

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can copy and paste this part however

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many times you want

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but before I finish I want to

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show you the exercise in real life

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so here I have copied and pasted

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my code and I'm going to upload

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it to the computer and check that

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everything is correct

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so upload okay everything works now I

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upload it to the arduino board it's

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uploaded and I go to the serial

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monitor here so I'm going to send

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my commands

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the first one is thirteen just cause

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I'll start with that one

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and the first ltd is shining what

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happens if I type twelve

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now the green one is shining and

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if I type eleven

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the yellow one shines now if I

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type one hundred and thirteen

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the red one turns off

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one hundred and twelve

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the green ones off and one hundred

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and eleven

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the yellow one is off so the

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interesting thing about this here is that

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I can control the arduino board from

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my keyboard this is the most amazing

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thing the point of this and you

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can see that it works in real

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life so you will have to do

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something like this programming orders to switch

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all the LED on and then to

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switch all of them off

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if you have understood the exercise with

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one LED switching it on

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then you should be able to have

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enough information to replicate and finish the

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rest of the exercise okay good luck