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Raspberry-Pi

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Information about Raspberry-Pi
Education

Published on March 15, 2014

Author: rhnfzl

Source: slideshare.net

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Raspberry PiRaspberry Pi

Content Layout  Raspberry Pi o Introduction o Types & Specifications o OS o Architecture o GPIO Pins o Hardware & Connectivity o Use of PI  Wireless Display over Bluetooth using Pi and Android Phone  Video o Raspberry Pi based FM Transmitter o Difference between Raspberry Pi & Arduino

What is Raspberry Pi? Raspberry Pi is a single board computer which is the size as small as a credit card.  Developed by Raspberry Pi foundation in UK  Costs around US$25 to $35 KEY FEATURES • Connect to the TV via HDMI interface • For learning programming • Act as a media centre for video playback or gaming functions  The Raspberry Pi measures 85.60mm x 56mm x 21mm (or roughly 3.37″ x 2.21″ x 0.83″) & It weighs 45g

Types& Specification Of Raspberry Pi  There are two types of Raspberry Pi : Model A Model B

OPERATING SYSTEM USED IN RASPBERRY PI  First you have to write it to a suitable (2GB or 4GB) SD card using the UNIX tool dd. Windows users can use Win32 Disk Imager.  Install NOOBS in your primary PC  List of OS Raspbian “wheezy” OpenELEC Occidentalis v0.2 Pidora RaspBMC RISC OS Arch Linux based OS

ARCHITECTURE OF RASPBERRY PI

PINSLAYOUT • 17 GPIOpins • 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 •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

Diagram includes BCM GPIO references (GPIO.BCM), common functions, WiringPi pin references, and Pin numbers (GPIO.BOARD). The Bigger Picture

Hardware & Connectivity inside the Pi COMPONENTSOFA RASPBERRY PI

POWER 5v micro USB connector (Similar to the one on a lot of mobile phones!)

A/V (AUDIO/VIDEO) HDMI Audio & Video (works with modern TVs and DVI monitors)

A/V (AUDIO/VIDEO) RCA Video (works with most older TVs) HDMI Audio & Video (works with modern TVs and DVI monitors)

A/V (AUDIO/VIDEO) RCA Video (works with most older TVs) HDMI Audio & Video (works with modern TVs and DVI monitors) 3.5mm Audio Standard headphone socket

CONNECTIVITY 2 x USB 2.0 ports

CONNECTIVITY 2 x USB 2.0 ports 10/100Mb Ethernet

CONECTIVITY 2 x USB 2.0 ports 10/100Mb Ethernet GPIO (General Purpose Input & Output)

INTERNALS SOC (System On a Chip) Broadcom BCM2835 700Mhz & 256Mb / 512Mb RAM

INTERNALS LAN Controller SOC (System On a Chip) Broadcom BCM2835 700Mhz & 256Mb / 512Mb RAM

INTERNALS JTAG (debug ports) LAN Controller SOC (System On a Chip) Broadcom BCM2835 700Mhz & 256Mb / 512Mb RAM

INTERNALS JTAG (debug ports) LAN Controller SOC (System On a Chip) Broadcom BCM2835 700Mhz & 256Mb / 512Mb RAM CSI (camera interface)

INTERNALS JTAG (debug ports) LAN Controller SOC (System On a Chip) Broadcom BCM2835 700Mhz & 256Mb / 512Mb RAM CSI (camera interface) DSI (display interface)

STORAGE SD Card Slot (supports SD cards up to 32GB)

10 USESFORA RASPBERRY PI

10 Office 123456789

12345678910 Office

9 Programming 1234567810

12345678910 Programming

8 Games Console 1234567910

12345678910 Games Console

7 Minecraft 1234568910

12345678910 Minecraft

6 Tor Router 1234578910

Tor Router 12345678910

5 HTPC 1234678910

12345678910 HTPC

4 Bartender 1235678910

Bartender 12345678910

3 Camera 1245678910

12345678910 Camera

2 1345678910 Clock

12345678910 Clock

1 2345678910 PiBot!

PiBot! 12345678910

WIRELESSDISPLAY OVER BLUETOOTH USING PI AND ANDROID PHONE

PROJECT OVERVIEW  Goal is to build a system using Raspberry Pi and an Android phone to get the wireless display over Bluetooth and setup a Virtual Network connection between them  The basic idea is to set up Bluetooth networking with the Pi, and use SDL VNC viewer to display the X screen on the Android device  Virtual NetworkComputing (VNC) is a graphical desktop sharing system that uses the Remote Frame Buffer protocol (RFB) to remotely control another computer. It transmits the keyboard and mouse events from one computer to another, relaying the graphical screen updates back in the other direction, over a network.

MOTIVATION  The basic idea of connecting a raspberry pi and an android over Bluetooth and VNC  Give usera flexibility to access and workremotely overthe phone  Can help save and store data over the pi and phone. The phone can be accessed completely over the Raspberry Pi  The Raspberry Pi is a pretty powerful device, but much of its benefits come when it's connected to the Internet. If we want to utilize the Pi for mobility, we should try this method of tethering it to our smartphones to get it online anywhere we have mobile data

SYSTEM ARCHITECTURESystem Architecture: An overall view of the system is as below: Ping On Pi Android Phone Bluetooth network setup UtilityVNC Set-up

BLUETOOTH NETWORK SETUP  The Raspberry pi is not equipped with the built in Bluetooth, so we need to follow the below steps:  Bluetooth dongle (We used version 2.0)  Install drivers  Commands on the command editor of pi to scan the devices over Bluetooth. This is needed only for first time  Connect

VNC SETUPFOR RASPBERRY PI  Using commands, we installed TightVNCServer over Raspberry Pi  Set the pixel format and geometry settings as for the Android display screen  Install client over android  Connect to Raspberry pi

LEARNING  Basic Raspberry Pi setup and connection  Connecting Raspberry Pi and android phone over Bluetooth and access the data and folders of Android from pi  Establishing the Virtual Network connection between the Pi and Android  This enables the users to remotely access the Raspberry pi system over a phone  Once completely installed, the Pi should automatically mount and connect to our mobile device when we plug it in, without having to fiddle around in the command  Can be enhanced and improved for future works like live demonstrations, programming and learning

SERVO WITH THE PI

Controlling a Servo with the Pi • Controlling the servos requires PWM, aka Pulse Width Modulation – The Arduino program has complete control of the microcontroller • when it is running loop() nothing else can use the CPU – Except for interrupt handlers written as part of the Arduino program – On the Raspberry Pi, your program runs within a Linux OS • The Linux OS may switch to running another program! – But you can change your program’s scheduling priority • Some ways of getting the Pi to give the impression that it is a real time system and to do PWM ‘properly’:

Connect a Parallax Servo Servo Connector: Black – Pi’s ground Red – Pi’s 5V White – signal on GPIO 17 Image credit: http://www.parallax.com/ NOTE: For a single small servo you can take the 5 volts for it from the Pi header, but doing anything non-trivial with four servos connected pulls the 5 volts down far enough to crash the Pi

Using WiringPi’s servo example #include <stdio.h> #include <errno.h> #include <string.h> #include <wiringPi.h> #include <softServo.h> int main () { if (wiringPiSetup () == -1) { // setup to use Wiring pin numbers fprintf (stdout, "oops: %sn", strerror (errno)) ; return 1 ; } softServoSetup (0, 1, 2, 3, 4, 5, 6, 7) ; // wiringPi pin numbers for (;;) { softServoWrite (0, 0) ; // wiringPi pin 0 is BCM_GPIO 17 delay (1000) ; softServoWrite (0, 500) ; delay (1000); softServoWrite (0, 1000) ; delay (1000); }

Running servo.c • To compile: gcc -Wall -o servo servo.c wiringPi/wiringPi/softServo.c  compile softServo.c -IwiringPi/wiringPi  path to softServo.c -lwiringPi  include wiring library • To run: sudo ./servo • Calling softServoWrite () ; – The 1st input is the pin number – The 2nd input refers to the number of microseconds of the pulse. • An input of 0 produces a 1000uSec (1mSec) pulse (hard left) • An input of 1000 produces a 2000uSec (2mSec) pulse (hard right) • An input of 500 produces a 1500uSec (1.5 mSec) pulse (stop)

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