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Arduino: Analog Output (native speaker) - Contenido educativo

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Subido el 21 de febrero de 2022 por David G.

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hello in this exercise we are going 00:00:02
to use the same circuit that we 00:00:05
used in the previous exercise so you 00:00:07
can see I have a voltage divider 00:00:10
connected the same way we connected it 00:00:11
the other day and we are reading 00:00:13
from five volts to zero volts using 00:00:16
the 00:00:19
zero analog connector 00:00:20
and we have the LED 00:00:23
connected to the arduino board the usual 00:00:26
way 00:00:28
but there is something different instead of 00:00:29
connecting it to number thirteen we are 00:00:32
connecting it to number eleven you can 00:00:35
see if i zoom in that numbers 00:00:38
eleven ten nine six five and three 00:00:40
they all have a line in front 00:00:45
of their number it means that these 00:00:46
connectors are different 00:00:48
and so these numbers can provide digital 00:00:49
values the same way we have been 00:00:52
doing during the previous days with the 00:00:54
high and low digital values but these 00:00:56
six connectors the ones with the line 00:00:59
in front of the numbers these can 00:01:01
also provide analog values 00:01:04
so this means that if we send 00:01:08
one volts two volts three volts we 00:01:11
could send one and a half two 00:01:14
and a half two point four zero 00:01:16
point three three point six whatever we 00:01:19
want and if this LED is connected 00:01:21
to eleven for instance it means that 00:01:24
we'll be able to provide any voltage 00:01:27
amount we want to control the intensity 00:01:30
of the LED so we will be 00:01:32
able to decide if it will shine 00:01:34
brighter or less bright 00:01:36
so let's have a look at the 00:01:45
simulation I will show you the code 00:01:46
later 00:01:49
if we're reading zero using the 00:01:53
zero connector eleven doesn't change it doesn't 00:01:56
send anything to the LED so it 00:01:59
won't shine 00:02:01
if we move it a little bit 00:02:05
higher it means we're reading a number 00:02:07
higher than zero and as you can 00:02:09
see the LED is shining just a 00:02:11
little bit more 00:02:13
now if we move it more we 00:02:15
read a number even higher the LED 00:02:17
will shine brighter and the higher the 00:02:19
number we read the brighter it will 00:02:22
shine this is the brightest value on 00:02:24
five 00:02:26
so it's the brightest back to zero 00:02:31
off 00:02:33
back to five so you can see 00:02:35
the range of values we're reading and 00:02:36
sending to the LED 00:02:38
now let's stop the simulation 00:02:43
and before we have a look at 00:02:47
the code we need to take into 00:02:48
account that a zero although it reads 00:02:50
analog values the arduino board will work 00:02:53
using integral numbers do you remember that 00:02:56
the analog input reads numbers from zero 00:03:00
to one hundred and two we studied 00:03:02
it in 00:03:05
the previous exercise means that we're going 00:03:05
to use one thousand twenty four values 00:03:08
this number zero is related to zero 00:03:13
volts and number twenty three number one 00:03:16
thousand twenty three is related to five 00:03:19
volts for instance if we have five 00:03:21
thousand and twelve that one in the 00:03:25
middle then we will be reading two 00:03:28
and a half volts it's the value 00:03:31
in the middle 00:03:32
so there's a proportional relationship between the 00:03:39
number we use and the voltage were 00:03:41
reading when we use these numbers as 00:03:43
output values we're going to use a 00:03:45
lower range of values we're going to 00:03:47
use a range of two hundred and 00:03:50
fifty six we will use numbers from 00:03:51
zero to two hundred and fifty five 00:03:54
so zero is real 00:03:57
rated to zero volts two hundred and 00:03:58
fifty five is related to five volts 00:04:00
and the one in the middle which 00:04:03
would be a one hundred and twenty 00:04:04
eight that is related to two and 00:04:07
a half volts so you see that 00:04:09
there's a proportional relationship between the integral 00:04:11
number and the voltage 00:04:14
so it's the same idea as the 00:04:17
first one although the range is just 00:04:19
four times shorter 00:04:21
so how will we program it well 00:04:23
the first thing we need to do 00:04:26
is create a variable in this case 00:04:27
our variable is called input and we 00:04:29
read the analog input with this block 00:04:33
the one that's connected to a zero 00:04:35
and we store it in the variable 00:04:38
called input 00:04:39
and then we're going to divide this 00:04:42
variable by four because the range we're 00:04:43
using for this output is four times 00:04:46
shorter than the range where using to 00:04:48
read the values and we use this 00:04:50
range to send this value to eleven 00:04:53
so it will send the value to 00:04:58
the LED and the LED shines according 00:05:00
to the value that we're sending 00:05:04
so on zero it doesn't shine here 00:05:09
in the middle it shines a little 00:05:11
bit and if we move it all 00:05:13
the way 00:05:15
it's the brightest okay so this is 00:05:17
the circuit this is the first thing 00:05:20
you have to do just create the 00:05:21
circuit but this is just the first 00:05:23
step your exercise is going to be 00:05:25
a little different 00:05:28
your exercise is here it's rgb we're 00:05:30
going to use a new component that 00:05:34
is called the rgb LED and you 00:05:36
can find it down here in the 00:05:40
components library 00:05:41
so it's an LED with four 00:05:44
pins four connectors the first one is 00:05:46
called a red connector one of them 00:05:48
is called the blue connector and one 00:05:51
of them is the green connector and 00:05:53
this one here is just the cathode 00:05:56
and it's connected to the ground through 00:05:58
the protection resistor that we always have 00:05:59
at two hundred and twenty 00:06:02
don't forget that 00:06:03
so it means that this LED will 00:06:06
combine three colors so we will read 00:06:08
three different values using a zero a 00:06:11
one and a two 00:06:15
okay can you see that we have 00:06:19
three voltage dividers connected the way we 00:06:20
connected just one before we will use 00:06:22
these three variables instead of having input 00:06:25
we will have input one input to 00:06:28
input three for example 00:06:31
so we will be reading three values 00:06:36
the same way that we have read 00:06:39
them before and we will send three 00:06:41
different analog outputs the same way we 00:06:43
sent them before one for the red 00:06:45
one for the blue and one for 00:06:48
the green 00:06:50
so let's look at the simulation to 00:06:51
understand it better if i move this 00:06:54
first one the red control it means 00:06:56
I'm sending five volts through the red 00:06:58
wires 00:07:00
and you can see the LED is 00:07:03
red if i use the second one 00:07:04
to the maximum value now I'm sending 00:07:07
five volts to the blue wire 00:07:09
and it's the same with the last 00:07:13
one now I am going to send 00:07:14
five volts through the green wire 00:07:16
so the important thing is that we 00:07:21
can combine for example green and blue 00:07:22
and we'll get a new color it's 00:07:26
almost turquoise 00:07:27
what happens if we combine blue and 00:07:30
red 00:07:32
well you know we'll have purple 00:07:35
so the idea is that every color 00:07:38
can be produced using some combination of 00:07:40
red green and blue and I'm not 00:07:42
going to show you the code but 00:07:45
it will be something that's repeated three 00:07:46
times like the goal of the previous 00:07:49
exercise so you have to use a 00:07:51
variable read a number from the connectors 00:07:53
a zero a one and a 00:07:56
a two and storing the number in 00:07:58
the variable then dividing the variable by 00:08:00
four and sending it to the output 00:08:03
we want eleven ten and nine if 00:08:05
you know the connections for this one 00:08:09
and the exercise should be pretty simple 00:08:11
so try controlling the rgb LED using 00:08:13
three voltage dividers 00:08:16
good luck 00:08:19
Idioma/s:
en
Autor/es:
David Gonzalez Arroyo, Alyssa Fantel
Subido por:
David G.
Licencia:
Reconocimiento - No comercial - Compartir igual
Visualizaciones:
123
Fecha:
21 de febrero de 2022 - 22:14
Visibilidad:
Público
Centro:
IES MARIE CURIE Loeches
Duración:
08′ 20″
Relación de aspecto:
1.78:1
Resolución:
1280x720 píxeles
Tamaño:
55.40 MBytes

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