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Hello. In this exercise we are going

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to learn how to use the LCD

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screen and

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we are going to connect it to the arduino board using

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again a serial connection there are

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serial connection with the computers but here

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we're going to use a specific serial connection

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and then we can find here ok

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here

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we can see the digital connectors we

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already know then and if we moved

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to the left we would find this

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one that is called the SCL

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and is one that is called the SDA

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ok these two connectors

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these two pins are used to

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transmit serial information and we can use

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them to send information to

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different devices not just one, so

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for example here we have the SCL

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connection, the yellow wire and

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here you can see that is connected

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to the SCL connection to

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the screen and here you

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can see that the yellow wire continues

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and goes to a new SCL

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connection okay so the two of them

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are using the same

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wire the same connection and the same

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for the SDA connection the

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green wire

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it is connected from the arduino board to

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the first one and then to the

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second okay and we also have two

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other connectors ground

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that is connected to ground obviously

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the power source there and red green

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and the red wire that is connected

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okay five volts

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and this is the way we connect

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different

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screens, LCD screens, to the computer

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To the arduino board, I'm sorry. We can

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connect several of them here we only

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have connected two but if we had

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a third one we would be able

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to connect it the same way

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okay just continuing the different wires

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each LCD is going to be

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defined

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click on it we want to be

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defined by the address, for example

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this one, the address for the first one

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is thirty four and the address for

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the second one is thirty two ok

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and there's another parameter here, that is

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the protocol kind of language we're

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going to use to program

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our LCD screen ok we

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use this protocol and the same

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and it is the same for the two

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of them okay different addresses but 
same

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protocol 
and we need to use different

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addresses because using different addresses the arduino

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board will be able to

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to know to which one is speaking

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or from which one is

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receiving information okay

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that's why we need different addresses okay

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this is the way we connect different

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devices. The LCD screen can be

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found here if you type LCD here

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there are two devices and the

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one we use is the I2C

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because I2C is the

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serial protocol we are going to

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use to connect it

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eh ok so what about programming it

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I want to open the block window

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to make it bigger easier

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to have a look at the codes. The first thing

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we need to look at every code

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every block we are going to use is in

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the blue library because the arduino

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I mean the LCD screen will

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receive information from the arduino board

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that's why we are using output blocks

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all of them are blue and

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here

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because we have two screens we are going to

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to set the two of them

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and we are going to use this block

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"configurar tipo de LCD"

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for example, address thirty two

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will be number one so thirty two

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this one is meant to be

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number one the lower

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one

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and

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and the lower one is going to be

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thirty four number two

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okay and we use this protocol

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the same protocol is here

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because both of them

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the LCD screen under the arduino

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board, both of them they need

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to speak the same language so number

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one will use this language to communicate

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with the arduino board is going to

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be connected in address thirty two the

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second one same protocol and thity four

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so this way we can

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we can connect several devices

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there are addresses from thirty

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two to thirty nine so we can

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connect eight different devices using this protocol ok

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and so be careful with addresses

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ok they are very important

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what other blocks do we have?

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we have

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this block

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first of all, in LCD one or two or

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three or four

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we can do

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different things for example we can switch

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the light on you can erase the

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screen, switch the light off what happens

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if we switch

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the light on for the first one

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if we start the simulation

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the first one is on but not the second one

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and that's ok

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we can change

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we can switch the second one on

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and we simulate it again

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an now is number two is on

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before

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continuing with the blue blocks

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I want you to realize that we are

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using this kind of loop

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not a real loop

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"al iniciar"

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this part of the program and this one

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"siempre", forever, is a real

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loop and not the first one. These are

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the two parts of the program

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in this new version of Tinkercad

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these two blogs have been included this

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one is the setup, "al iniciar" means

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that they are going to

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be run just once and then "siempre"

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means

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this is the real code i mean

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the part of the program that will

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be repeated again and again so

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"al iniciar" we are using

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these two blocks "configurar LCD"

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here because we we only need to

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set it up once and no more than that

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and the rest of the code

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that will be repeated again and again

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is here, so

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I'll go back to "siempre", forever, and for example

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we can switch the light on

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we can also erase the screen ok

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we are going to erase the screen later

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but for the moment we are going

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to print a character for example we are

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going to print, we are going to

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switch number

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one on just a light ok you

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you can print things if the

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screen is off for example

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we are going to do it later, don' t worry

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for the moment just with

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the light on

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let's go to print "hello world"

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number one if you click start the

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simulation

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number one is

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there's a problem, it is repeating again

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and again and again "hello world"

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"hello world", hello world"

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how can we solve it?

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we can solve it for example using "borrar pantalla"

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but if we print and we erase

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there's no time to see anything so

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let's use a

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"esperar"

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so we will print "hello world"

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we will wait for one second and

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then the screen will be erased again

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and we need a second "esperar"

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because this way it will be

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a kind of blink okay can you

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imagine how will it work? "Hello World"

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for one second then nothing for one

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second

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then we start again

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Let's start the simulation

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Can you see? It's a kind of blinking

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This block, the first one, there's no

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need to be the forever block

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it can be here

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this way the screen will be switched

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on just once

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In this code okay so

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Let's start the simulation again and you will

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see that it works the same way

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Hello world

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nothing

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now I want you to see that

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switching the light on

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doesn't mean

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that this one will not work

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there is no light but we

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can see the code so

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okay but there are more instructions to

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take into account this one is really

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really interesting, it means

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"establecer posicion", position means where we

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want to

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to print the character for example

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imagine we want to print the character

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in position number

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well, first of all

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there are columns arrows every every every

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LCD

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I'll run the simulation, it will be easier with light

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there is a first row

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there's a second row

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and there are columns this is the

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room number zero this is raw number

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one

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this is column numbers zero, one, two, three

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four, until fifteen okay so with this

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block, "establecer posición"

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we can decide where we want to print

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for example imagine want to print in

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first raw, number zero,

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position the middle more or less number

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eight instead of typing "hello world" we will to

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type something like that

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let's have a look

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It is printed there in the middle of the position

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we can change position for example instead

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of number row I mean column eight

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we can chose column four

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and instead of using raw zero we can use row one

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Now the position is different

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raw number one, remember this one the upper one

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is zero and the other one is one

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position zero one two three and four

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so we can decide where we want

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to print things okay

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very very important defining the different addresses

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for everyone

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we can print in different LCD

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for example I'm going to duplicate this block

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on this part

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I want

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the program number two two and I'm going to

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program it in number twelve

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raw number zero

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i'm going to print it

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in number two instead of

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using

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this one. I'm going to use the slash

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I'm going to erase them too ok this way

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you can to see that we can

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program different screens at the same time

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because they have different addresses

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Let's have a look. So we will have two different

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blinkings one for the first one the

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first one for the upper

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here this character, here the second character

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I can also

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I can also switch the light on for the

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second one

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okay

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and let's start the program again

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easier to see if the light is on

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so we have these different instructions

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"configurar"

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to define the program, the language, the code we are going to use

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we are going to use this one, so don't change it

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and the addresses we are going to use

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every screen will have a different address

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we also have this block, the LCD "activar luz de fondo"

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we can

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erase the screen there are other possibilities

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but from the moment we are going

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to use just this one "activar luz de fondo"

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or switch it on and switch it off

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or "borrar la pantalla", erase the screen

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we also have "establecer

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posición" means define where you want to

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print

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to define the position you want to print okay

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and here "imprimir" means you are going to

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write something on this position

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the one you have already defined really

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really easy using these screens connecting them

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and you only have three or four

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types of blocks okay four types

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of blocks, nothing more than that

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okay so the exercise for you is

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is not going to be difficult, you will have to

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repeat

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again we will have two screens

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start simulation

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and they will behave this way

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okay

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so

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it's not difficult just kind of blinking

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but with different positions, first position

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second position, third position, fourth position

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the first two positions in

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the upper LCD screen and the two

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following positions in the lower LCD screen

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okay if you have understood

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the example. Programming it it's really easy

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so that's all

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all you need to know