Arduino microcontroller ins and outs with pin diagram

What is Arduino?
• The Arduino is an open source hardware and software platform that is
incredibly powerful yet easy to use.
• You can look at and download the code from any of the Arduino repositories on
GitHub here:
• https://github.com/arduino
• This platform has captured the imagination of electronic enthusiasts and the
maker community everywhere. It enables people to inexpensively experiment
with electronic prototypes and see their projects come to life.
• Projects can range from simply making an LED blink or recording the
temperature to controlling 3D printers or making robots.
• While there are numerous models of the Arduino, in this course we will
primarily be using the very popular Arduino UNO R3 board.

Arduino Uno's R3 board layout
DC supply Input: The DC supply input can
be used with an AC-to-DC power
adapter or a battery. The power source can
be connected using a 2.1 mm centerpositive
plug. The Arduino Uno operates at 5 volts
but can have a maximum input of 20 volts;
however, it is recommended to not use
more than 12V.
Voltage Regulator: The Arduino uses a
linear regulator to control the voltage
going into the board.
USB Port: The USB port can be used to
power and program the board.
RESET button: This button, when pressed,
will reset the board.

ICSP for USB: The in-circuit serial
programming pins are used to
flash the firmware on the USB
interface chip.
ICSP for ATmega328: The
in-circuit serial programming pins
are used to flash the firmware on
the ATmega microcontroller.
ATmega328: The microcontroller
for the Arduino Uno board.

Digital and PWM connectors: These pins,
labeled 0 to 13, can be used as either a digital
input or output pins. The pins labeled with the
tilde (~) can also be used for Pulse-Width
Modulation (PWM) output.
Analog In Connectors: The pins, labeled A0 to
A5, can be used for analog input. These pins
can be used to read the output from analog
sensors.
Power and External Reset: These pins in this
header, provide ground and power for external
devices and sensors from the Arduino. The
Arduino can also be powered through these
pins. There is also a reset pin that can be used
to reset the Arduino.

Arduino shields
• An Arduino shield is a modular circuit board
that plugs directly into the pin headers of
the Arduino board.
• These shields will add extra functionality to
the Arduino board.
• If we are looking to connect to the internet,
do speech recognition, control DC motors
or add other functionality to the Arduino,
there is probably a shield that can help us.
• While you don’t have to use shields, they
do make adding extra functionality to our
Arduino boards very easy.

Arduino looks with two shields attached:
•A shield fits on top of
the Arduino by
plugging directly into
the pin headers.
•We can also stack one
shield on top of
another if they do not
use the same
resources. Here is how
an

Arduino pin
• There is a total
of 31 pins in the
Arduino Uno pin
headers.
• Most of these
pins can be
configured to
perform
different
functions.

Digital pins
•Used the most when
connecting external
sensors.
•These pins can be
configured for either
input or output.
•These pins default to
an input state
•The digital pins will
have one of two
values: HIGH (1),
which is 5V, or LOW
(0), which is 0V.

Analog input pins
• The Arduino Uno contains a
built-in Analog-To-Digital (ADC)
converter with six channels, which
gives us six analog input pins. The
ADC converts an analog signal into
a digital value.
• While the digital pins have two
values, either high or low, the
analog input pins have values from
0 to 1023 relative to the reference
value of the Arduino.
• The Arduino Uno has a reference
value of 5V.
• Used to read analog sensors such
as rangefinders and temperature
sensors.
• The six analog pins can also be
configured as digital pins if we run
out of digital pins in our project.

PWM pins
• Where the analog input
pins are designed to read
analog sensors (input),
the PWM pins are
designed for output.
PWM is a technique for
obtaining analog results
with digital output.
• Since a digital output can
be either on or off, to
obtain the analog output
the digital output is
switch between HIGH
and LOW rapidly.
• The percentage of the
time that the signal is
high is called the duty
cycle.

Duty cycle
• We have the ability to set the
frequency of how fast the signal
can switch between HIGH and
LOW.
• This frequency is measured in
Hertz and sets how many times
the signal can switch per
second.
• For example, if we set the
frequency to 500 Hz, that
would mean that the signal
could switch 500 times a
second.
• This will be come clearer as we
use the pins.

Power pins
• VIN: This pin is used when we
power the Arduino board using an
external power supply.
• GND: These are the ground pins.
• 5V: This is 5V out and is used to
power most sensors.
• 3.3V: This is 3.3V out and can be
used to power sensors that are
compatible with 3.3V.
• Reset: This pin can be used to reset
the Arduino board by an external
source.
• ioref: This is the reference voltage
for the board. For the Arduino, this
will be 5V.

Serial pins
• Used for serial communication.
• The RX (digital pin 0) is used to
receive.
• TX (digital pin 1) is used to
transmit.
• Serial communications work on
binary (1’s and 0’s).
• Provided for legacy reasons
primarily.

SPI pins
• The Serial Peripheral Interface
(SPI) pins are used for a
synchronous serial data protocol
that is used by microcontrollers for
communicating with peripheral
devices.
• This protocol always has one
master with one or more slave
devices.
• MISO: The Master in Slave out pin
is used to send data from the slave
to the master device.
• MOSI: The Master out Slave in the
pin is used to send data from the
master to the slave device.
• SCK: The serial clock synchronizes
the data transmission and is
generated by the master.
• SS: The slave select pin tells the
slave to go active or to go to sleep.
This is used to select which slave
device should receive the
transmission from the master.

Installing the IDE
• The first step in programming an Arduino board install the
Arduino IDE (integrated development environment).
• Linux/Raspberry PI
• This program checks code and loads it onto the Arduino. Install
the latest version of Arduino IDE using apt:
• sudo apt-get update && sudo apt-get upgrade
• sudo apt-get install Arduino
• Windows
• Download from: https://www.arduino.cc/en/Main/Software

Programming in for Arduino
• The Arduino programming language
is based on a very simple hardware
programming language called
processing, which is similar to the C
language.
• You create sketches which contain
your code
• After the sketch is written in the
Arduino IDE, it should be uploaded
on the Arduino board for execution.
void setup( )
{
statements;
}
void loop( )
{
statement;
}
The setup function is the first to
execute when the program is
executed, and this function is called
only once.
Used to initialize the pin modes and
start serial communication. This
function has to be included even if
there are no statements to execute.
The execution block runs after setup
and hosts statements like reading
inputs, triggering outputs, checking
conditions etc..
As the name suggests, the loop( )
function executes the set of
statements (enclosed in curly braces)
repeatedly.
Basic code
structure

Example
program
int led = 9; // The digital pin to which the LED is connected
int brightness = 0; // Brightness of LED is initially set to 0
int fade = 5; // By how many points the LED should fade
void setup()
{
pinMode(led, OUTPUT); //pin 10 is set as output pin
}
void loop() // The loop function runs again and again
{
analogWrite(led, brightness); // set the brightness of LED
brightness = brightness + fade; //Increase the brightness of LED by 5 points
if (brightness <= 0 || brightness >= 255) // check the level of brightness
{
fade = -fade;
}
delay(30); // Wait for 30 milliseconds
}
LED fade-in and
fade-out

Arduino microcontroller ins and outs with pin diagram

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Arduino microcontroller ins and outs with pin diagram