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Arduino: random - Contenido educativo
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Hello. In this exercise we are going to reuse a previous circuit.
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We are going to use the one with the digital input.
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So here, if we have all the circuits we already have, we can duplicate whatever we want.
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For instance, we are going to use the digital input.
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If we click on the wheel, we can duplicate it, we can copy it.
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We click on duplicate, wait a little bit, and a copy of this circuit will appear.
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In this exercise, we are going to use more or less the same connections.
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We are going to use the input, the digital input, with the button, the pull-down resistor,
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and we are going to use LEDs as output.
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But here, instead of having just one of them, we are going to use four of them.
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So, the first thing we need is a room.
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So, I'm going to click and drag the button here, for instance.
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I'm going to click and drag the wire, I'm going to click and drag the pull-down resistor,
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remember the 10 kOhms one, there you see, 10 kOhms one, and I'm going to click and drag
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the wire, the input wire.
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And I'm going to use number 13, 12, 11 and 10 to control 4 different LEDs, so I'm going
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to click and drag the input wire from the button to number 9.
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And now I'm going to click and drag the four LEDs.
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Well, I already have one, so just three of them.
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One, two, three, and four.
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And I will also need three more resistors.
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All of them connected to the anode, the one that is not straight.
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One, two, and three.
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And remember that I have to change their values.
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220 ohms 1, because this is the value we need to protect the LEDs.
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220 ohms. Ohms is not the same as kilo ohms, so that way I have changed the kilo ohms to 220 ohms.
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And now I'm going to connect the LEDs using the wires.
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The first connection I want is the four black wires that are connected to ground.
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black again, and black again. Here, black again. Okay. All of them... I made a mistake here.
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Be careful when you... I want to erase the whole thing. Be careful when you draw wires
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because sometimes you make mistake and you don't realize you have made a mistake.
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Now, I have a single wire. So, these four wires are connected to ground because this
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because this horizontal line can you see the horizontal line is connected to
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ground through this wire okay and now I want I need the connection from 12 to
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this one from 11 to this one and from 10 to this one so I have everything I need
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related to the different components now I need to program the circuit so I'm
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going to open the window related to code and I have the previous program. I want
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to modify it a little bit because some of the possibilities are, some of the ideas
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are the same. Again I am reading the input from number 9, so instead of
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reading from 12 now I'm reading from 9, so I will modify. Leer pasado digital, ok.
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I have a variable, I read from number 9 and I store it
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in this variable and if this variable
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if this input is high, something will happen here and if the
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input is not high, something else will happen here. So
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the first thing we need is, before we start moving on, is a
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random number. If we go to the
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green library, the one related to maths, there is a
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block here related to random number that allows us to generate random number here i want a random
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number from 10 to 13. why 10 to 13 because i'm going to use these four connectors so i'm going
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to select and i want to use a number from random number from 10 to 13. realize that there is a bar
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here if there's no enough room you can click and drag this bar and you will have enough room
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so the same way and we move on the same way we have done with this variable we are going to
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uh i know i'm sorry i i need an extra variable because i have a random number i was moving too
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fast i was a random number but i need to store it somewhere so i'm going to create a new variable
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this variable will i i can name it however i want but i'm going to use output because this random
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number will be the output that will shine so I'm going to work the same way
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I worked before I'm going to define I output using this random number okay so
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output will have this random number from 10 to 30 okay so what happens if I press
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the button one of the LEDs will shine which one it depends on the random
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number, so I have to check the value of the input, not the input, the output, I'm sorry.
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So I'm going to use the comparison block again, I'm going to use the equal, and I'm going
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to check the value of output.
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So for instance, if output equals 13, something will happen, but I need the if block to C,
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if C.
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Now I'm comparing. If this output, that is the random number, equals 13, what will happen?
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What do you think? It will happen that output number 13 will be high and this block will
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be here, inside the first if, because if the input, the one we are reading here, is high
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and the output, the random number, is 13, number 13 will shine.
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Something similar will happen with 12, 11, and 10.
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So I will duplicate this code.
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If I right-click here, I have the possibility of duplicate,
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and I will click and drag here.
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This second if is inside the first if.
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Can you see the structure?
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But now, instead of comparing with 13, I'm going to compare with 12,
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And now, if output equals 12, number 12 will be hide.
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The same for 11.
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If output equals 11, 11 will be hide.
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And I'm going to duplicate again, duplicate.
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No, not here, I made a mistake.
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This one has not to be here, it has to be here.
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Can you see the difference?
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Now, if output equals 10, number 10 is the one that's going to be high.
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All of them are here.
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It means if I press the button, one of these three possibilities will be true
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and one of these connectors will be high and the LED connected to it will shine.
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But what happens if the input is not high?
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If I'm not pressing the button, really easy, as you can guess, we will have four LEDs that are low.
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13, sorry, be careful when you click and drag the block.
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12, 11, I'm duplicating all the time.
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And 10, here's 10.
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So, if I don't press the button, it means this condition is not true, we go to the C
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no, the else condition, and the four of them are low.
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And the random number has to be here, with these four blocks.
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Everything has been programmed properly, everything has been connected properly, so I can start
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the simulation.
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If I click on the button, ok, everything is working, nothing happens because I'm not pressing
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the button, but if I press the button, one of them is shining, ok?
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If I not press, none of them shines.
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If I press again, another one is shining, again and again and again and again, but realize
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that I cannot guess which one is going to shine because it's a random process, ok?
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So, okay, this is the circuit.
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We are going to connect and to program today, okay?
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Good luck.
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- Autor/es:
- David Gonzalez Arroyo
- Subido por:
- David G.
- Licencia:
- Reconocimiento - No comercial - Compartir igual
- Visualizaciones:
- 216
- Fecha:
- 10 de enero de 2021 - 18:20
- Visibilidad:
- Público
- Centro:
- IES MARIE CURIE Loeches
- Duración:
- 09′ 21″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 1920x1080 píxeles
- Tamaño:
- 28.88 MBytes
