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Good morning.

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Today we are going to create a new circuit.

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I have already logged in in Tinkercad and now I'm going to click on Crear Nuevo Circuito,

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Create New Circuit.

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I'm in.

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As always, the first thing I need is the protoboard, the Arduino board and now I'm going to click

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and drag the LEDs.

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Because in this exercise, instead of controlling one single LED, we are going to control four

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of them.

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We are going to control a sequence of LEDs.

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So I am going to click and drag one of them, this one is connected here and here, remember

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that the vertical lines are all of them together, the five of them are together.

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So I have one LED, a second one, a third one, and a fourth one.

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The first one is going to be controlled with pin number 13, we connect it to the anode,

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the one that is not straight, 13 with this one, the second one with 12, the third one

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with 11 and the fourth one with 10.

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But remember we need to close the circuit.

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All of them are going to be connected to ground, to this connector.

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I'm going to use it in a different way.

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This one will be the ground, so I'm going to connect it here, I'm going to draw it black,

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the same for this one, black again, I need more room so I'm going to move it here, and

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the same for this one, to make the drawing clearer. Black, black, the same for this one,

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black, and the same for this one. Black. Ok. Now, I need the resistor. Remember that every

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time we send a current to an LED, we need a protection resistor. And remember, we need

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a 220 ohms one so I click on the resistor and I type 220 but instead of kilo ohms we're going

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to use ohms so I have my resistor now and my resistor I'm going to connect it here

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is the resistor connected to the four ones yes because of this horizontal line the lower

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connector of the resistor this one is connected to this this this and this because all of them

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are connected using the horizontal line and now i'm going to use the ground connector and i'm

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going to connect it here maybe it looks a little bit messy okay now i think it looks better okay

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this is the ground connector and through the resistor is is connected to this one this one

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this one and this one okay so now i have all the connections i need now it's time to program the

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Arduino board, because it's the one that is controlling, that will control the 4 LED.

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So I click on the code button and I don't need this one.

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So I'm going to program the Arduino board this way.

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Number 13 will be on for one second and then it will be off.

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And then the moment this one is off, this one will start shining, and the same with

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this one, the same with this one.

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So the first thing we are going to do is defining number 13 or switching number 13 to on.

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Then we will wait for one second and after having waited for one second, number 13 will

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be off, 13 and low, that is the same.

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The moment 13 has been high for one second and now is off, it will happen the same with

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12 with 12 and sorry 11 and 10 so we will repeat this block how can we repeat

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the same okay we can click on that and drag again that is easier if we right

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click and we click on duplicate so I have the same for I will have the same

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for 12 12 and 12 I duplicate again to pick up 11 and 11 and I duplicate again

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then because 10 is the last one I made a mistake and now I have to connect we

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have four parts of the program but now I'm going to connect all of them. I click

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and drag and now they are all of them connected. And it's the same idea for all

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of them. On for one second and then off and at this moment the second one

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starts shining. And if I click here... No, I'm not going to click here. If I

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click in Iniciar Simulación, let's have a look. Can you see the sequence? So this

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is the X our exercise good luck