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Hello. In this exercise we are

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going to reuse a previous circuit the

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one that we made with the digital

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input so here we can find all

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the circuits that we've already made and

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we can duplicate whichever we choose for

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instance since we're going to use a

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digital

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input we click on the wheel

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here and then we can duplicate it

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or copy it

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if we wait a second

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then a copy of the circuit will

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appear now in this exercise we're going

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to use almost the same connections we

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are going to use the digital input

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with a button and the pull-down resistor

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and we're going to use LED

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as output but here instead of having

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just one of them we're going to

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use four of them

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so the first thing we need to

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do is make a little bit of

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room so I'm going to click and

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drag the button over and then the

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wire and the pull-down resistor remember that

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this is a ten kilo ohms one

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and I'm going to click and drag

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the input wire

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I'm going to use pin numbers thirteen

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twelve eleven and ten to control the

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four LED so I'm going to

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click and drag the input wire from

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the button to number nine

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and now I'm going to click and

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drag the four LED just by

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adding three more to the one that

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we have

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therefore I will also need three more

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resistors

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and remember all of them are connected

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to the anode the pin that is

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not straight

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now remember for the LED we

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need to change these values to be

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two thousand two hundred and twenty ohms

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because this is the value that we

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need to protect the LED and remember

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that ohms and kilo ohms are not

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the same thing

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so now I'm going to connect the

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LED using the wires and the

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first connection I want is to make

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the four black wires that are connected

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to the ground

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we'll make them all black like always

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and be careful when you draw the

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wires because sometimes you make a mistake

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and you don't realize that you've made

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a mistake so you can just delete

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what

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what you do

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and start over

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okay so now I have a single

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wire and these four wires are connected

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to the ground because of this horizontal

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line you see that the horizontal line

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is connected to the ground through these

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wires and now I need a connection

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from twelve to this one from eleven

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to this one from ten

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to this one and now that I

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have everything I need with all the

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components

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so now I need to program the

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circuit so I'm going to open the

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coding window and we just want to

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modify the program we already have because

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some of the possibilities and ideas are

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the same so I'm not going to

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get rid of all of it

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and again I'm reading the input for

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number nine so instead of reading from

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number twelve now I'm reading from nine

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so we modify that here

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so I have a variable that I

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read from number nine and it's stored

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in this variable so if this variable

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or input is high then something would

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happen here and if the input is

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not high then something else will happen

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down here that will program

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so the first thing we need is

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a random number so if we go

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to the green library about math there

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is a block here related to random

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numbers that allows us to generate one

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from a range now I want a

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random number from ten

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two thirteen because these are our LED

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connector pin numbers so it has

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to be somewhere between these four

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I also realize that there is a

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bar down here so if it looks

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like there's not enough room just click

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and drag this and you can see

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everything

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now there's one more thing I almost

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forgot before we move on is that

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if I have a random number here

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I still need to store it somewhere

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so I'm going to create a new

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variable under variables we can name it

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anything we want but I'm going to

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use output because this random number will

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be

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the output that will make the LED

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shine so just like we did before

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I'm going to define output using this

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random number so output will have a

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random number from ten to thirteen

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okay so what happens if I press

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the button is one of the LED

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these will shine well which one

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it just depends on the random number

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generated

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so I have to check the value

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of the output now to do this

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I'm going to use the comparison block

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again

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we will use the equal sign and

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I want to check the value of

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the output so for instance if output

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equals thirteen then something will happen but

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I also need a block for the

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if so now I'm comparing if the

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output that is the random number equals

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thirteen

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then what will happen will then output

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number thirteen will be high and this

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block will be here inside the first

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if because if the input or the

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one we are reading here is high

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and the output is thirteen then number

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thirteen will shine

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so do you see this and

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then if it generates for a random

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number thirteen the same happens for twelve

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eleven and ten so I will duplicate

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the same code and put it again

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in the subset

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so the second if condition is inside

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the first if condition

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but now instead of comparing with thirteen

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I'm going to compare with twelve and

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now if output equals twelve twelve will

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be high

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then duplicate again for number eleven if

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the output is eleven then eleven will

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be high

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and duplicate again for our last pin

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for number ten

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you see I almost put that in

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the wrong place but this one has

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to be connected to the others so

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now if output equals ten number ten

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is the one that's going to be

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high all of them are here so

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it means if I press the button

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one of these possibilities will be true

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one of these connectors will be high

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and the LED connected to that number

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will shine

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but what happens if the input is

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not high if i'm not pressing the

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button you can probably guess that we

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will have all four LED that

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are low so these are under the

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if not condition so let's add thirteen

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twelve

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eleven and ten

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eleven

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and ten so if I don't press

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the button it means that this condition

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is not true and it will go

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to the if not condition and all

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four will be low and the random

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number has to be here connected to

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these four blocks

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so now everything has been programmed and

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connected properly you see

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so I can start the simulation

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and if I click on the button

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of course nothing happens because I am

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not pressing the button but if I

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am then one of them will shine

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if I release they are off and

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if I press again another one will

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shine you can press it over and

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over but we can't guess which one

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is going to shine because

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as we programmed it to be random

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okay this is the circuit you will

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now connect and program today good luck