Introduction To Raspberry Pi with Simple GPIO pin Control

-a 35 dollar mini computer
Raspberry-pi
An Introduction

Who Am I ?
I am Pradip Bhandari.
Member of Robotics Club
Final Year Student
Electronics And Communication Engineering
Familiar with Raspberry pi for more than two years
I love Hardware and Software more than a girl
Contact info : “masterpradipg”

Handling the RP
-The Raspberry Pi was built to be used, but not abused. Every
Printed Circuit Board (PCB) should be handled with care.
-Handle the RP only by the edges of the board itself.
Avoid touching or holding any of the components on the
board.
-Rough handling can cause solder points to fail and may result in
short circuits, but be careful with the GPIO pins as well.

Agenda
 Introduction To Raspberry Pi
 Features
 How it differs from other Board?
 Applications
 Setting Up Hardware Connection
 Operating System choice
 Demo
 GPIO
 Simple GPIO Python Programming
 Demo

What is the Raspberry Pi?
Small single-board computer, Credit card size and costs approximately £35
Developed by Raspberry pi foundation UK with the intention of promoting the
teaching of basic computer science in schools
It has all possible features of modern computers
Model: Rpi 1 Model A, A+, Rpi 1 Model B, Rpi 1 Model B+(2012)
and Rpi 2 model B(2015)
Introduction

Raspberry Pi Features
 CPU 700MHz ARM1176-JZFS
 GPU Broadcom VideoCore IV @250 MHz
 Memory 512MB LPDDR2-800
 2 built in USB hub
 Video HDMI, composite
 Audio HDMI, stereo analog
 Ethernet cable
 5V Micro USB
 Fanless
 It does not include a built-in hard disk , but uses an SD card for
booting and long-term storage.
Features

Raspberry Pi
Micro USB
Power
HDMI

Raspberry Pi
Micro USB
Power
HDMI
ETHERNET

Raspberry Pi
Micro USB
Power
HDMI
ETHERNET
2xUSB 2.0

Raspberry Pi
Micro USB
Power
HDMI
ETHERNET
2xUSB 2.0
AUDIO

Raspberry Pi
Micro USB
Power
HDMI
ETHERNET
2xUSB 2.0
AUDIO
VIDEO

Raspberry Pi
Micro USB
Power
HDMI
ETHERNET
2xUSB 2.0
AUDIO
VIDEO
GPIO

Raspberry Pi
Micro USB
Power
HDMI
ETHERNET
2xUSB 2.0
AUDIO
VIDEO
GPIO
SD CARD

Raspberry Pi
Micro USB
Power
HDMI
ETHERNET
2xUSB 2.0
AUDIO
VIDEO
GPIO
SD CARD
Camera connector

Raspberry Pi
Micro USB
Power
HDMI
ETHERNET
2xUSB 2.0
AUDIO
VIDEO
GPIO
SD CARD
Screen Panel Connector
(TFT touch Screen)
Camera connector

Micro USB power port
The micro USB power port is used to power the Raspberry Pi device.
HDMI port
The HDMI output is used to plug into a modern television or monitor.
Ethernet port
The Ethernet port is used to connect the Raspberry Pi to the internet or a local network.
USB ports
USB 2.0 ports are used to plug in a keyboard, mouse, web cam, external hubs etc.
Audio output
The audio output can be used to plug into an external amplifier or an audio docking station.
GPIO headers
The GPIO headers are used to connect the Raspberry Pi to other hardware devices. For example, they can be used to
connect to LEDs, motors and other electronic components.
video output
The video output is used to connect to an older type television.

Ingredients
1 x SD Card - 4GB or above
1 x Monitor or TV with a HDMI cable
1 x Mouse
1 x Keyboard
1 x Ethernet LAN cable (optional - needed if you require a network connection)
1 x Micro USB power supply (many mobile phone chargers will work but it must supply 5V and have at least 700mA)
Note: Some monitors do not have HDMI ports – in this situation you will need to have
an adapter – you can get a HDMI to DVI or a HDMI to VGA.

How it differs from other Board
Low power consumption
PC takes 65-250W
Laptop takes 15-60W
Raspberry Pi 5v,700mA=3.5W
Low cost
Small in size

What Can You Do With It?
Raspberry Pi is a flexible platform, there’s no single way to use it, Whether you just want to watch videos
and surf the web, or you want to hack, learn, and make with the board for fun, utility, and experimentation
General purpose computing
• graphical desktop environment with a web browser
• install a wide variety of free software like LibreOffice, Games, etc.
Learning to program
• Raspberry Pi is meant as an educational tool to encourage kids to experiment with computers, it comes
preloaded with interpreters and compilers for many different programming languages
• You can write programs for your Raspberry Pi in many different languages
• programming languages like Python, C, Ruby, Java, Perl etc.
Project platform
• The Raspberry Pi differentiates itself from a regular computer not only in its price and size, but also
because of its ability to integrate with electronics projects

Applications
Home Automation System.
Home Security System.
HD surveillance Camera.
Media Center.
We can develop what we can think using GPIO.

Applications
• Can be used for making super
computers

Applications
Raspberry Pi Medical Device Input Shield

Applications
• Solar Raspberry Pi
Power Pack

Applications
• It can make your Old TV in to a smart TV. (You can play
Videos, 3D Games, Music, Browse Internet and much
more.
• Raspberry Pi can Act as Full HD 1080p Media Player.
• You can connect a Monitor, Keyboard and Mouse and
use it as a normal computer.
• Its Graphics Capabilities is better than Apple
Products(2012).

Setting Up Hardware Connection
Basic Setup
Connect Monitor via HDMI or Video Out
Connect Mouse and Keyboard
Connect OS loaded Memory card
Power it up

OS choices
● Raspbian wheezy(free, based on Debian )
● ArchLinusArm
● PiDora(Fedora remix for pi

Loading OS in Memory Card
A software called “Win32DiskImager” is needed
Install and run it
1 2
3
1. Browse OS
2. Select Drive
3. Write it
4. After few minutes your
memory card will be
ready

DEMO
When promoted for username and password enter default value as
username: pi
Password: raspberry
Now we will be at Default console
To start Graphical User interface(GUI) type command “startx” and press enter

• It is a generic pin on an Integrated circuit
whose behavior, including wheather it is
an input or output pin, can be controlled
by user at the run time
• GPIO pin have no special purpose defined,
and go unused by default
General Purpose I/p O/p(GPIO)

General purpose digital inputs/outputs
• Outputs used to control external circuits
– Switch leds on/off
– Switch relays on/off
– Actuate solenoid
• Inputs used to monitor status
– Read switch status
– Alarm inputs

RPi General Purpose IO (GPIO) Pins
• 17 GPIO pins brought out onto the P1 header
• most have alternated functions
• two pins for UART; two for I2C; six for SPI
• All 17 pins can be GPIO (i.e., INPUT or OUTPUT)
• all support interrupts
• internal pull-ups & pull-downs for each pin
• I2C pins have onboard pull-ups
• using them for GPIO may not work
• Pins are 3.3V not 5V like on the Arduino
• They are connected directly to the
Broadcom chip
• Sending 5V to a pin may kill the Pi
• Maximum permitted current draw from
a 3.3V pin is 50mA
Image credit: http://elinux.org/RPi_Low-level_peripherals

Simple LED connection
Our actual connection:
Led1: cathode to Ground
anode to any GPIO
Led2: cathode to Ground
anode to any GPIO

Programming
• By default, supporting Python as the educational
language.
• Any language which will compile for ARMv6 can
be used with the Raspberry Pi, though; so you’re
not limited to using Python.

Python
• To program the GPIO ports in Python, we need to install a very useful Python 2
library called Rpi.GPIO. This module gives us a simple to use Python library that will
let us control the GPIO pins.
• To install RPi.GPIO, we first need to install the Python Development toolkit that
RPi.GPIO requires.
• To do this enter the following command into LXTerminal:
sudo apt-get install python-dev
• Then to install Rpi.GPIO itself type:
sudo apt-get install python-rpi.gpio
• We will probably be prompted to confirm by entering 'Y'.

Simple python program to blink LED
import RPi.GPIO as GPIO #import python 2 GPIO library
from time import sleep #import time library to use sleep
GPIO.setmode(GPIO.BCM) #initializing BCM
GPIO.setup(7,GPIO.OUT) #set up GPIO pin 7 to out
GPIO.setup(8,GPIO.OUT) #set up GPIO pin 8 to out
While 1:
GPIO.output(7,0) #set GPIO pin 7 to level 0
sleep(1)
Sleep(1)

DEMO
LED blinking using Python

Introduction To Raspberry Pi with Simple GPIO pin Control

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