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Hello. In this exercise, we are going to continue studying how the computer can communicate,

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can send and receive information from the Arduino board.

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Here on the screen, you can see the circuit we are going to use.

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We have four LEDs connected to the usual connectors, 13, 12, 11 and 10.

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We are going to use digital outputs and every LED is connected to a 220 ohms protection resistor.

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okay so nothing new for the moment let's go to the code we're going to have a look at the code here

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this block layer de la serie read from the serial monitor is the the new one this is a

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purple block it means that this from the input library and it means that the Arduino board is

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reading from the serial connection it means it's reading from the wire that is connected to the

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from the USB that is connected to the computer.

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So we have a variable that is called serie, just because I want

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this name. So we take the value, the number, from the USB, from the wire,

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and we store it inside the variable.

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And now I'm going to use this variable to control the Arduino board. Here, for

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instance, just because I want, if this variable equals 1, 13 will be

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high so it means the red led will shine so let's have a look let's start the simulation

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i start nothing happens remember that the serial monitor is here if i click here and to send

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variables we send number we have to type here in this box if i type one and i press enter

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nothing happens. Yes, because there is a problem. This block, LeerSerie, is not

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a good one if we want to read integer numbers. There is a problem with the

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simulation, but it's not a huge problem, it's not a big problem, we can solve it

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this way. We are going to change from Blocks to Text. Remember

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when we... well, don't remember, it's the first time we do this. When we change

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from blocks to code we will not be able to come back to the blocks okay so when

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we change we have to be sure about the things we are doing okay so we click

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here continue and we have here the code so here this is the variable I mean the

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function we are using to read serie the variable equals this function so here

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instead of using SerialRead, we are going to use a new function that is

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called SerialParseInt. If you have any problem writing here, try a

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second time or a third time, okay? It works, but sometimes you can't do it the

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first time, I don't know why. So here we have the new code. I have only

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changed this function we are using to read the number, and now I'm going to

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start the simulation again. And now, if I press 1 here, the LED is

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shining, okay? This is really really simple. So, your exercise. Your exercise is

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a little bit more complicated than this one. You will repeat the code, you will go

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back, you will remember that you can stop the video and go back, and you

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You will read the variable the same way and you will add several blocks for switching

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it on, switching it on, switching it on, switching it on.

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You will have four numbers to switch each one of them on and you will use other four

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numbers to switch them off.

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And remember, the serial monitor here for you is here, okay?

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So for example, you can use one, two, three and four to switch them, one, two, three and

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four the four of them or maybe you can or and then you can use for instance five six seven and eight

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to make them off the orders you are sending to the i mean through the usb okay i think it's not

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really easy if you can you can program it instead of repeating the blocks you can copy and paste

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this part okay this is the part we you can copy and paste to reproduce the different orders the

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different possibilities 13 is the number of the connector instead of high you can use low and

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one is here is the number of the code we use to send information so you can copy and paste this

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part of the code if you want to okay you don't have to go back to the blocks program a new a

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new circuit and then create a new a new code you don't have to you can copy and paste this part

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however many times you want okay so the exercise is really simple but before i leave i want to

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show you this exercise in the real life here i have copied and pasted my code and i go to i'm

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going to upload it to the computer and check that everything is correct verificar okay compilado

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fine everything works i upload it to the arduino board okay subiendo subido upload it and now i go

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to the serial monitor here so i'm going to send my commands the first one is 13 why 13 just because

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I want to and I want to type 13 the first LED is shining what happens if I type 12 why 12 just

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because the green one is shining what happens if I type 11 the yellow one is shining again why 11

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just because I want to what happens if I type 113 the red one is off 112 the green one is off

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and 111 the yellow one is off so the real interesting thing here is that i can control

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the arduino board from my keyboard okay for me this is the the amazing thing so and you can see

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that it's true in real life it works okay so okay remember distractions you have to do something

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like this programming orders orders to switch all the leds on and to switch all of them off

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If you have understood the exercise with one LED switching it on, it's enough.

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You don't need nothing more to understand and to do the exercise, okay?

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So, good luck.