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Arduino: multiple input - Contenido educativo
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Hello, today we are going to program a new circuit. It's similar to the ones we have
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already programmed. We will use the protoboard, the Arduino board, and we are going to use
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three LEDs. So we click and drag, click and drag, and click and drag.
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And we are going to connect them in a similar way we have connected them before.
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We use a black wire here, because it's connected to the ground, this is the ground, and we are going to use the three protection resistors.
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Remember that the protection resistor, the three of them, every protection resistor is going to be 220 ohms, not kilo ohms, ohms.
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and again with another protection resistor again 220 ohms and again with
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the third one here 220 ohms okay and this LEDs the three of them are going to
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connected to 13, 12 and 11. Ok, so these three LEDs are going to be our output and
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now the different part because we are going to use these switches. We are going
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to use two switches because we are going to use two digital inputs. We are going
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to use 10. I'm going to use an orange wire. Why orange? Just because. And the same orange
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here. And remember that we are going to connect, we need a pull-down resistor. You remember
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when we have, when we used the single button, it was 10 kilo ohms. The pull-down resistor
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was a 10 kilo ohms one. And again, a 10 kilo ohms one here. And here, I'm sorry, this one
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is going to be here, and this one is going to be here. And 10 kilo ohms, both of them.
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Okay. And we also need a 5 volts connector. We take it here, 5 volts, and I'm going to
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connected here, and this one is going to be red. And I need
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a red connection here. I mean red because it's not
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black, right? Because I want five volts here
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and the same with this one. I made
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a mistake. This one has to be connected here. Can you see the difference? And the same with
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this one. Right. Sometimes we make mistakes
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connecting wires, and that's why sometimes the circuits
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don't work this is not nothing related to the programming is related is because we have we
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haven't connected the wires properly so here instead of having the usual button i have two
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switches why two switches because i'm going to manipulate them this way when i press one of them
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i have a single pointer pointer if i want to press the other one i cannot be pressing by both
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positions at the same time. So, that's why I'm going to use a switch. A switch has, remember,
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we studied the switch in the classroom. The switch, I mean, switches have two permanent
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states on and off. That's why we need two switches instead of two buttons because if
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we use a button, the moment we finish pressing, the connection is closed, okay? So, that's
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That's why we are using two switches.
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You will understand it better later in the simulation.
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So this switch is connected the same way the button has been connected.
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Now there is no connection between this point and this point, okay, can you see this position?
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So here this wire is connected to ground through the pull-down resistor.
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The moment there is a connection between this wire and this wire, I have five volts here
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and five volts will be red here in the connector 10,
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and the same for number nine, okay?
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Now, the simulation.
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What do I want to do?
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I want to simulate the circuit this way.
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I'm going to, first of all,
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I'm going to program it step by step.
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The first thing I need are two variables.
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I'm going to name them input nine and input 10.
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Why? Because we are reading two inputs, from 9 and from 10.
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The second variable will be input 10.
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For the moment, I haven't said anything about the behavior of the circuit.
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I'm going to explain it while I'm programming it.
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Don't worry if you don't understand because I haven't said anything.
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So, the first thing we are going to do is reading number 9 and number 10.
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We have Entraje, Ler, Pasador, Digital.
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So we are going to read 9 and we are going to read 10
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because they are the ones we are reading, 9 and 10.
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And we are going to use these readings to define input 9
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and to define input 10.
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It means we are reading these two connectors and we are storing their values into variables.
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Remember that the variables are like boxes and we can store values inside them.
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Here we are going to store high or low depending if the switch is on or off.
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So, now, the behavior. What do I want?
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Well, first of all, I need an if.
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Remember the si?
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There are four possibilities.
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The two switches on, the two switches off,
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the first one off and the second one on,
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and the first one off and the second one on, or vice versa.
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Anyway, I want, I need two ifs.
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Si, si entonces.
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And there are four possibilities.
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And to compare, remember that we already know
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this one equals
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in the previous exercises we have used this one equal
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and equal. I need two of them because here I'm going to use
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the and connector. I'm going to make it smaller to make it a little bit easier
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because there are two possibilities. First possibility
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number nine, low. Let's have a look here
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no, low and another possibility is
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number 10 low. And if 9 is low and 10 is low, to combine both of them, I'm going to use the
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i, the ant in English. Can you see that I'm combining them? So here the condition is if 9 is low
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and 9 is low, something will happen. I click and drag. So I'm using this condition. Instead of
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Instead of using one single condition, we are combining two conditions using the AND, okay?
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This is the purpose of this exercise, combining two different conditions.
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That's why we have two different inputs.
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What do I want if both of them are off?
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I don't know.
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Whatever you want.
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So we are considering that if both of them are low, 13, 12, 11 are low.
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It's really easy.
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We use three blocks, like, oh, I'm sorry, I made a mistake, be careful when you are moving and dragging the blocks, so if 9 and 10 are low, I will decide that 13, 12, and 11, the three of them are low.
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Why? Just because. Just because I want.
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Okay. What else? Anyway, I'm going to remove
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these three ones and I'm going to copy because it's easier this way. Duplicate.
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What happens if 9 is high
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and 10 is low? I don't know. What do we
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want? For instance, we want that 13 is high. Why not?
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13. If we press this one, this one will be high.
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Why not? Okay, this is the second possibility. What happens if 9 is low and 10 is high?
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So it means that if we are pressing this one or if this one is on, for example, I want this one is
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is high. Why not? So this one is 11, 11 high. Okay. Why? Just because I am programming it
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this way. And what happens if the two of them, 9 and 10, are high? Okay. Just because we
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want, we can program a blinking. So we are going to program a blink the way we know it.
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Now we use await, and now I'm going to duplicate this part of the code. Baja, low, low, and
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low. Do you agree that if both of them are low, sorry, low and low, if both of them are
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low, if 9 and 10 are low, this is a blinking program. Okay. So realize that there are four
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if blocks, four if parts, because we have the four possibilities. Low and low, low and
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high, high and low, and high and high. And for every possibility, I have a different
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behavior. Okay. Let's see if it works the way we have programmed it. Okay. Okay. Both of them are
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off. The three lights are off, as expected. If this one is... I made a mistake. I don't know.
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Ah, where's the mistake? Again, a problem with the wires. There is no ground connection.
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be careful with the grounds black can you see that now that the three resistors are connected
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to ground now i'm i am closing the circuit now everything will work let's start again
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okay okay okay again there is a problem with the connections
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Where's the problem? Ah no, there's no problem
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because it's according to the program. If the three of them
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are low, if the two of them are low, there is a blink
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It makes sense. If, oh I'm sorry, if the two
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of them are high, this is, no
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I made a mistake. I made a mistake with the program
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I want to check it again. Alta, baja, baja. And it's the last part of this alta, alta, okay?
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Alta, alta. If both of them are high, we want a blink. If both of them are low, alta, alta, baja, baja, alta, alta, baja, baja.
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They are low, alta, alta, it's a blink, okay?
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It's important that when you program, you check the behavior with your programming.
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It's not a big problem making mistakes. Now, the two of them are low.
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Baja, baja. Nothing happens. They are low. If I press this one,
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this one is 10. Alta.
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Two of them are high. I'm going to modify it just because I want to. I want to
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to consider that just 11 is low, is high and mean. Can you see the difference now? Okay,
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let's start the simulation again. Both of them are off, nothing happens. If I press
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this one, this one is shining, perfect, according to the program. If just this one is on, this
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one is shining, perfect, according to the program. And what happens if the two of them
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are high, the blinking program. So the program works, the circuit behaves according to the
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programming. We have made some mistakes, but this is not a big problem, it's not a big issue,
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because we can check, we can compare, we program with the behavior, the same way that when you
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simulate the circuit, you can check the behavior with your program, with the way you have connected
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or the way you have connected everything, okay? So this is the circuit, okay? I repeat the behavior.
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If nothing is connected, nothing happens. If one of them is connected, this one is shining.
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If the other one is connected, this other one is shining. And if both of them are connected,
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there is a blink. The three of them, the three LEDs are blinking, okay? So the important thing
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is realizing that there are four possibilities baja baja low low high low low high and high high
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okay check the four possibilities don't make the same mistake i made and compare with the
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compare the four possibilities the four behaviors okay
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it's not it's not difficult okay so this is the exercise for today good luck
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- Autor/es:
- David Gonzalez Arroyo
- Subido por:
- David G.
- Licencia:
- Reconocimiento - No comercial - Compartir igual
- Visualizaciones:
- 306
- Fecha:
- 10 de enero de 2021 - 18:22
- Visibilidad:
- Público
- Centro:
- IES MARIE CURIE Loeches
- Duración:
- 15′ 29″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 1920x1080 píxeles
- Tamaño:
- 49.53 MBytes
