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Arduino: LCD (I2C) - Contenido educativo

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Subido el 17 de julio de 2022 por David G.

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Hello. In this exercise we are going 00:00:01
to learn how to use the LCD 00:00:03
screen and 00:00:06
we are going to connect it to the arduino board using 00:00:09
again a serial connection there are 00:00:12
serial connection with the computers but here 00:00:14
we're going to use a specific serial connection 00:00:16
and then we can find here ok 00:00:19
here 00:00:22
we can see the digital connectors we 00:00:24
already know then and if we moved 00:00:25
to the left we would find this 00:00:27
one that is called the SCL 00:00:29
and is one that is called the SDA 00:00:31
ok these two connectors 00:00:33
these two pins are used to 00:00:36
transmit serial information and we can use 00:00:39
them to send information to 00:00:42
different devices not just one, so 00:00:44
for example here we have the SCL 00:00:46
connection, the yellow wire and 00:00:48
here you can see that is connected 00:00:51
to the SCL connection to 00:00:52
the screen and here you 00:00:54
can see that the yellow wire continues 00:00:56
and goes to a new SCL 00:00:59
connection okay so the two of them 00:01:01
are using the same 00:01:03
wire the same connection and the same 00:01:04
for the SDA connection the 00:01:06
green wire 00:01:08
it is connected from the arduino board to 00:01:10
the first one and then to the 00:01:13
second okay and we also have two 00:01:15
other connectors ground 00:01:18
that is connected to ground obviously 00:01:21
the power source there and red green 00:01:24
and the red wire that is connected 00:01:27
okay five volts 00:01:30
and this is the way we connect 00:01:32
different 00:01:34
screens, LCD screens, to the computer 00:01:37
To the arduino board, I'm sorry. We can 00:01:39
connect several of them here we only 00:01:41
have connected two but if we had 00:01:43
a third one we would be able 00:01:45
to connect it the same way 00:01:47
okay just continuing the different wires 00:01:48
each LCD is going to be 00:01:52
defined 00:01:55
click on it we want to be 00:01:56
defined by the address, for example 00:01:58
this one, the address for the first one 00:02:00
is thirty four and the address for 00:02:02
the second one is thirty two ok 00:02:05
and there's another parameter here, that is 00:02:08
the protocol kind of language we're 00:02:10
going to use to program 00:02:14
our LCD screen ok we 00:02:16
use this protocol and the same 00:02:19
and it is the same for the two 00:02:23
of them okay different addresses but
same 00:02:25
protocol
and we need to use different 00:02:27
addresses because using different addresses the arduino 00:02:30
board will be able to 00:02:32
to know to which one is speaking 00:02:34
or from which one is 00:02:37
receiving information okay 00:02:39
that's why we need different addresses okay 00:02:42
this is the way we connect different 00:02:45
devices. The LCD screen can be 00:02:48
found here if you type LCD here 00:02:51
there are two devices and the 00:02:54
one we use is the I2C 00:02:57
because I2C is the 00:02:59
serial protocol we are going to 00:03:01
use to connect it 00:03:02
eh ok so what about programming it 00:03:05
I want to open the block window 00:03:11
to make it bigger easier 00:03:16
to have a look at the codes. The first thing 00:03:20
we need to look at every code 00:03:22
every block we are going to use is in 00:03:25
the blue library because the arduino 00:03:26
I mean the LCD screen will 00:03:29
receive information from the arduino board 00:03:32
that's why we are using output blocks 00:03:34
all of them are blue and 00:03:36
here 00:03:40
because we have two screens we are going to 00:03:41
to set the two of them 00:03:44
and we are going to use this block 00:03:47
"configurar tipo de LCD" 00:03:49
for example, address thirty two 00:03:52
will be number one so thirty two 00:03:55
this one is meant to be 00:03:58
number one the lower 00:04:00
one 00:04:01
and 00:04:03
and the lower one is going to be 00:04:06
thirty four number two 00:04:08
okay and we use this protocol 00:04:11
the same protocol is here 00:04:14
because both of them 00:04:16
the LCD screen under the arduino 00:04:20
board, both of them they need 00:04:22
to speak the same language so number 00:04:24
one will use this language to communicate 00:04:26
with the arduino board is going to 00:04:28
be connected in address thirty two the 00:04:30
second one same protocol and thity four 00:04:33
so this way we can 00:04:35
we can connect several devices 00:04:38
there are addresses from thirty 00:04:41
two to thirty nine so we can 00:04:44
connect eight different devices using this protocol ok 00:04:45
and so be careful with addresses 00:04:52
ok they are very important 00:04:55
what other blocks do we have? 00:04:59
we have 00:05:02
this block 00:05:05
first of all, in LCD one or two or 00:05:12
three or four 00:05:15
we can do 00:05:17
different things for example we can switch 00:05:19
the light on you can erase the 00:05:23
screen, switch the light off what happens 00:05:25
if we switch 00:05:29
the light on for the first one 00:05:30
if we start the simulation 00:05:32
the first one is on but not the second one 00:05:37
and that's ok 00:05:39
we can change 00:05:42
we can switch the second one on 00:05:44
and we simulate it again 00:05:46
an now is number two is on 00:05:49
before 00:05:51
continuing with the blue blocks 00:05:54
I want you to realize that we are 00:05:57
using this kind of loop 00:05:59
not a real loop 00:06:02
"al iniciar" 00:06:03
this part of the program and this one 00:06:04
"siempre", forever, is a real 00:06:06
loop and not the first one. These are 00:06:08
the two parts of the program 00:06:11
in this new version of Tinkercad 00:06:13
these two blogs have been included this 00:06:18
one is the setup, "al iniciar" means 00:06:21
that they are going to 00:06:23
be run just once and then "siempre" 00:06:24
means 00:06:27
this is the real code i mean 00:06:28
the part of the program that will 00:06:29
be repeated again and again so 00:06:31
"al iniciar" we are using 00:06:33
these two blocks "configurar LCD" 00:06:35
here because we we only need to 00:06:37
set it up once and no more than that 00:06:39
and the rest of the code 00:06:42
that will be repeated again and again 00:06:44
is here, so 00:06:45
I'll go back to "siempre", forever, and for example 00:06:49
we can switch the light on 00:06:54
we can also erase the screen ok 00:06:57
we are going to erase the screen later 00:07:00
but for the moment we are going 00:07:01
to print a character for example we are 00:07:03
going to print, we are going to 00:07:06
switch number 00:07:08
one on just a light ok you 00:07:08
you can print things if the 00:07:10
screen is off for example 00:07:12
we are going to do it later, don' t worry 00:07:16
for the moment just with 00:07:18
the light on 00:07:19
let's go to print "hello world" 00:07:22
number one if you click start the 00:07:24
simulation 00:07:26
number one is 00:07:28
there's a problem, it is repeating again 00:07:32
and again and again "hello world" 00:07:34
"hello world", hello world" 00:07:35
how can we solve it? 00:07:38
we can solve it for example using "borrar pantalla" 00:07:39
but if we print and we erase 00:07:44
there's no time to see anything so 00:07:46
let's use a 00:07:48
"esperar" 00:07:49
so we will print "hello world" 00:07:53
we will wait for one second and 00:07:56
then the screen will be erased again 00:07:57
and we need a second "esperar" 00:08:00
because this way it will be 00:08:01
a kind of blink okay can you 00:08:03
imagine how will it work? "Hello World" 00:08:06
for one second then nothing for one 00:08:08
second 00:08:10
then we start again 00:08:11
Let's start the simulation 00:08:12
Can you see? It's a kind of blinking 00:08:20
This block, the first one, there's no 00:08:25
need to be the forever block 00:08:28
it can be here 00:08:31
this way the screen will be switched 00:08:33
on just once 00:08:35
In this code okay so 00:08:38
Let's start the simulation again and you will 00:08:40
see that it works the same way 00:08:42
Hello world 00:08:45
nothing 00:08:47
now I want you to see that 00:08:52
switching the light on 00:08:53
doesn't mean 00:08:57
that this one will not work 00:08:58
there is no light but we 00:09:04
can see the code so 00:09:06
okay but there are more instructions to 00:09:12
take into account this one is really 00:09:15
really interesting, it means 00:09:17
"establecer posicion", position means where we 00:09:20
want to 00:09:23
to print the character for example 00:09:26
imagine we want to print the character 00:09:29
in position number 00:09:31
well, first of all 00:09:34
there are columns arrows every every every 00:09:36
LCD 00:09:41
I'll run the simulation, it will be easier with light 00:09:43
there is a first row 00:09:54
there's a second row 00:09:59
and there are columns this is the 00:10:01
room number zero this is raw number 00:10:05
one 00:10:07
this is column numbers zero, one, two, three 00:10:09
four, until fifteen okay so with this 00:10:12
block, "establecer posición" 00:10:17
we can decide where we want to print 00:10:19
for example imagine want to print in 00:10:23
first raw, number zero, 00:10:26
position the middle more or less number 00:10:30
eight instead of typing "hello world" we will to 00:10:33
type something like that 00:10:36
let's have a look 00:10:40
It is printed there in the middle of the position 00:10:45
we can change position for example instead 00:10:49
of number row I mean column eight 00:10:51
we can chose column four 00:10:54
and instead of using raw zero we can use row one 00:10:57
Now the position is different 00:11:04
raw number one, remember this one the upper one 00:11:08
is zero and the other one is one 00:11:10
position zero one two three and four 00:11:12
so we can decide where we want 00:11:15
to print things okay 00:11:17
very very important defining the different addresses 00:11:25
for everyone 00:11:28
we can print in different LCD 00:11:33
for example I'm going to duplicate this block 00:11:36
on this part 00:11:39
I want 00:11:44
the program number two two and I'm going to 00:11:45
program it in number twelve 00:11:48
raw number zero 00:11:53
i'm going to print it 00:11:56
in number two instead of 00:11:58
using 00:12:01
this one. I'm going to use the slash 00:12:03
I'm going to erase them too ok this way 00:12:06
you can to see that we can 00:12:09
program different screens at the same time 00:12:10
because they have different addresses 00:12:13
Let's have a look. So we will have two different 00:12:15
blinkings one for the first one the 00:12:18
first one for the upper 00:12:20
here this character, here the second character 00:12:24
I can also 00:12:29
I can also switch the light on for the 00:12:31
second one 00:12:35
okay 00:12:37
and let's start the program again 00:12:39
easier to see if the light is on 00:12:43
so we have these different instructions 00:12:47
"configurar" 00:12:51
to define the program, the language, the code we are going to use 00:12:53
we are going to use this one, so don't change it 00:12:57
and the addresses we are going to use 00:13:00
every screen will have a different address 00:13:03
we also have this block, the LCD "activar luz de fondo" 00:13:07
we can 00:13:12
erase the screen there are other possibilities 00:13:14
but from the moment we are going 00:13:16
to use just this one "activar luz de fondo" 00:13:17
or switch it on and switch it off 00:13:21
or "borrar la pantalla", erase the screen 00:13:24
we also have "establecer 00:13:26
posición" means define where you want to 00:13:30
print 00:13:33
to define the position you want to print okay 00:13:33
and here "imprimir" means you are going to 00:13:36
write something on this position 00:13:38
the one you have already defined really 00:13:41
really easy using these screens connecting them 00:13:44
and you only have three or four 00:13:47
types of blocks okay four types 00:13:49
of blocks, nothing more than that 00:13:52
okay so the exercise for you is 00:13:53
is not going to be difficult, you will have to 00:13:55
repeat 00:13:58
again we will have two screens 00:14:00
start simulation 00:14:05
and they will behave this way 00:14:07
okay 00:14:10
it's not difficult just kind of blinking 00:14:14
but with different positions, first position 00:14:17
second position, third position, fourth position 00:14:19
the first two positions in 00:14:22
the upper LCD screen and the two 00:14:25
following positions in the lower LCD screen 00:14:28
okay if you have understood 00:14:32
the example. Programming it it's really easy 00:14:34
so that's all 00:14:39
all you need to know 00:14:43
Idioma/s:
en
Autor/es:
David Gonzalez Arroyo
Subido por:
David G.
Licencia:
Reconocimiento - No comercial - Compartir igual
Visualizaciones:
159
Fecha:
17 de julio de 2022 - 12:40
Visibilidad:
Público
Centro:
IES MARIE CURIE Loeches
Duración:
14′ 47″
Relación de aspecto:
16:10 El estándar usado por los portátiles de 15,4" y algunos otros, es ancho como el 16:9.
Resolución:
1152x720 píxeles
Tamaño:
30.86 MBytes

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