Arduino Tutorial #1 - Digital Inputs and Outputs - Button & LED Video Lecture

how's it going guys Vlad here and
welcome to the first Arduino tutorial of
a series for this particular tutorial
we're going to cover the digital inputs
and outputs and you're going to need
your Arduino Uno you're going to need a
breadboard
several jumper wires a push-button an
LED and a corresponding resistor in my
case it's a 120 ohm so without any
further delay let's get started so the
Arduino itself has 13 pins which are
capable of doing digital inputs and
outputs they are located up here along
with the ground and the a RF pen so for
the first example we're going to use the
thirteenth pin as long as as well as the
led on the Arduino itself and for the
second one we're going to choose a
different pin and connect our led and
the resistor to make it blink so let's
get started with the software alright so
in order for the LED on the pin 13 to
blink we have to write a series of
instructions so we're going to define
our LED to be on pin 13 we're going to
write a setup function which is
basically a function which defines any
inputs and outputs for the Arduino and
you know and in our case the only pen
were going to define is going to be the
pin 13 so a pen 13 output we're going to
create a void loop function which is
going to repeat until the Arduino is
powered down and in this case we're
going to write a hi to the LED followed
by a half of a second dollar so 500
milliseconds followed by a digital write
LED low which is going to turn that off
another delay of 500 milliseconds and
we're going to close our loop so we need
to verify the sketch and we're going to
upload it to the Arduino so let's see
what it does if you have done everything
correctly and uploaded the sketch to the
Arduino you should see the LED blink
every half of a second so let's do
something more complicated and instead
of having this LED blink we're going to
use a breadboard Billy small circuit
with an LED and a resistor on it all
right so for the second example what we
need to do is to run two wires one from
pin 12 and one from the ground pin of
the Arduino onto the breadboard we're
going to connect on LED in series with a
resistor obviously the pen of the
positive pin of the LED is going to go
into pin 12 and the negative pin of the
LED is going to go into the resistor and
that's going to all go to the ground so
we need to make a small we need to make
a small modification to our program so
in this case all we have to do is put
pin 12 for the LED verify the sketch
again and upload it to the Arduino and
once we're going to build the circuit we
can hook everything up and see how it
looks like okay so let's build our
circuit one thing to pay attention to is
that the longer lead of the LED is going
to go into the positive pin or the pin
or the pen 12 of the Arduino so we're
going to place it on the breadboard
we're going to connect the n 12 to the
positive lead we're going to place our
resistor on the second count of the LED
and we're going to plug in the ground
pin into the other end of the resistor
so let's hook up the power to the
Arduino and see what it does as we
expected the LED on the pin 12 is now
blinking for the final circuit we're
going to add a button tour board which
is going to turn on and off the LED so
let's take a quick look at how this is
done first of all we're going to put it
on pin 4 we're going to have a pulldown
resistor to the ground notice how I
broken out the ground as well as the
volts onto the breadboard rails so this
resistor is going to go straight to the
ground to keep the pen array low and
when the button is pushed is going it's
going it's going to go to the 5 volts
rail so it's going to toggle between 0
and 5 volts we're going to also have to
modify our program to include the button
so in this case we're going to add a
button on pin 4 we're going to have to
include an additional definition of the
input so button input and what we're
going to do here is replace the delays
with an if statement so in this case
we're going to do if digital read button
and if it is equal to high so when the
button is pressed we are going to turn
on the LED otherwise or else the LED is
going to have to be turned off so let's
quickly verify the sketch see if there's
any mistakes and we're going to upload
it to the Arduino and let's take a look
at the circuit alright so as you can see
I have connected the circuit and you can
see the button right below the LED it is
connected through a pulldown resistor to
the ground the the input the order
reading on and 4 is connected to the
button as well as the pulldown resistor
and on the other side you have the
button going to the high voltage rail so
I have uploaded the sketch and let's
take a look at what it does so as I push
the button
as expected the LED is going on and off
so everything works as expected and
notice that in this case we don't need
any button debouncing as some of you may
be familiar with the term and we're
going to take a look at that in the next
tutorial so please comment subscribe and
let me know if you want to see some
something different or
some different components for the
Arduino thank you very much bye