10/74 MOOC IoT Part I: Electronics. MultiSensor Shield


Hello, my name is Leopoldo
Armesto and in this presentation I will introduce you
the MultiSensor Shield. Let me, first, present you the
outline of the presentation I will give you or describe the
features of the MultiSensor Shield and then I will describe
the pinout of this Shield when you connect it to
the Wemos D1 R32 board. And then, I will give you
some details of circuits that you have
in the Shield And some examples that
you can use to extend the possibilities of the Shield
with additional electronics. So let me first present
you the features. It has two pushbuttons,
it has two fixed LEDs, it has one RGB LED
and one potentiometer. It also has a humidity
and temperature sensor, an analog temperature
sensor and a light sensor and it
also has an infrared receiver, a
buzzer and a connector for I2C connections
and two… sorry, three additional pins
D7, D8 and A3 available for any purpose. So
this is the pinout of the shield, ok? on the left
column you can see the name of the components, of each of
the components that I’ve described, on the column in the
middle you have the corresponding pin that it’s mapped
onto the Wemos>D1
R32 board whenever you plug the shield on it and then
on the right column what you have is the name that you will
see on the shield, ok? So, for instance, the push button on
the shield you will see D2 but this pin will be actually
connected to IO26 on the ESP chip.
So, here what I’m showing you is detailed circuits
what you have on the board, indeed, ok? So, the board it’s just
simply one single board with all the components, all together,
but the equivalent circuit it’s the one I’m
showing you here. So the two switches are connected
to D2 and D3 inputs and whenever you push the
button, the logic level goes to zero. Then, we have a the digital
humidity temperature sensor which is connected to D4 and
it’s just directly connected as you can see here.
Then, we have the buzzer which is driven through a
transistor and it’s connected to pin D5 and we can generate
PWM signals on this pin in order to produce sounds.
Then, we have the red blue and green LED they
are… it’s just simply a LED which is connected
to D9, D10 and D11 [pins] and has obviously
three associated resistors to limit the current. Then,
we have two fixed-color LEDs one is red and the
other one is blue and they are connected
to D12 and D13. Then we have a potentiometer
which is connected to analog A0 and you can rotate
it and then we have also a light sensor
which is the LDR and it’s connected to A1 and here
we have the temperature sensor, the analog temperature sensor,
it’s connected to A2. Finally, with this board what
we can do is to connect extra components that we might be
interested in using them in our projects like
for instance an OLED So we can connect it to the
I2C connector. By connecting the display to pins SDA and
SCL. Equivalently, we can connect the barometric…
sensor pressure which is also an I2C
sensor which means that we have to connect it
also on these lines. It’s just worth it to mention that
in these buses we can connect several components on the same bus lines,
so we can share these lines. Here, we can see an example
of how to connect the AC light dimmer so, for instance,
we can use the pins available for general
purpose D7 and D8 and we can use the corresponding
AC light dimmer circuitry, LED driver and
the LED [lamp] itself. This is just basically
used to dimm/regulate the intensity of light and here what we can see
is how to connect, for instance, a relay and we can connect
it to A3. Remember that, A3 is not specifically for analog [inputs].
It’s just simply an input for the ESP processor
which could be analog but could be also digital.
So, for instance, here we can control a relay, for instance, to
activate or deactivate a fan. Finally, here we can
use a moist sensor in which we can use after the
same pin, for instance, to read the analog measurement. Well, a in this presentation
and I just have introduce you the MultiSensor shield. Thank
you very much for your attention and I hope to see you
my next presentation

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