An introduction to Raspberry PI and related modules

1. Raspberry pi
An Introduction

3. What is Raspberry pi
 Credit card sized computer with incredible features
SOC HDMI ETHERNET
GPIO

4. USP?
 Model A = $25
 Model B = $35
 Uses low power SOC (System on Chip) Broadcom
BCM2835
 BCM2835 supports applications from word
processing, web-browsing to 3D gaming
 Linux OS
 Industry standard for prototyping IOT applications
We’re excited to announce that we are expanding our Windows
Developer Program for IoT by delivering a version of Windows 10
that supports Raspberry Pi 2 -Microsoft

5. Brains of PI
 ARM1176JZF is the central nervous system of PI
 This means any language that can compile on
ARMv6 can be used with raspberry pi

6. Features of PI
 SOC powerful enough to easily render
opengl 3D graphics, games and other
multimedia applications
 512 MB of ram
 Low power consumption (micro USB few
watts)
 Built in support for Camera module
 40 GPIOs
 4 USB ports
 Audio output
 SD card (primary storage device)

7. GPIO general purpose IO
 Raspberry pi model B+ has a set of
about 40 GPIOs

8. What is a GPIO?
 A GPIO is a terminal for electronic
signals which can act as source or
sink of signals.
 Signals may be both control as well as
data signals
 Plays an important role in automation
applications
 Python package required to use GPIO
from raspberry pi
sudo apt-get install python-RPi.GPIO

9. BCM vs Board-mode
 Board mode means to refer to the pin-
number via it’s position on the board
starting from 1-40
 In BCM mode we refer to the pin
names rather than by numbers. It is
based on Broadcom SOC channel
number

10. Words of Caution !!
 While working with GPIO it is
important to keep in mind that they are
directly connected to the micro-
processor
 Means NO overhead protection
 If a high current/voltage signal is
applied to the pin, It may burn the PI

11. Booting up the Raspberry
 Step-1 “Choice of OS”

12. Where to get??
 http://www.raspberrypi.org/downloads/

13. For windows and linux users
 Download the zip file and extract the OS image
 Insert sd card in the sd card reader
 Use Win32DiskImager to write to the sd card
 Detailed instructions can be found on the raspberry pi
website:
 http://www.raspberrypi.org/documentation/installati
on/installing-images/windows.md
 For Linux Users:
 http://www.raspberrypi.org/documentation/installati
on/installing-images/linux.md
 Caution: Linux users should be very careful with
the use of DD command.

14. NOOBS Project
 “New Out Of The Box Software” for beginners
 It gives you the options to choose from different
operating systems
 Download NOOBS zip file and extract it
 Format SD card and “drag/drop files into it”
 On first boot we see a screen like this

15. For Lazy Coders
 Perhaps the most easy way to get
started with Raspberry PI
 Buy an SD card with NOOBS pre-
installed and plug it into the pi
 Saves you a lot of time if you are more
concerned about app development

16. Monitor, mouse and keyboard
 Raspberry pi supports High Definition
video output through HDMI port
 We can use our HD TV as a monitor
for raspberry pi
 Raspberry pi has 4 usb ports and any
2 can be used to connect a mouse
and a keyboard

17. I can’t take LED with me all the
time
 Relax we have a solution !!
 Now edit the IPv4 settings in windows
also So they are both in same local
network
Edit: /etc/network/interfaces

18. SSH into your pi
 Use an ssh client e.g. PUTTY
 ssh pi@192.168.137.10
 Enter the password of your raspberry
pi
 Start Exploring

19. Why Pi is choice of IOT
industry
 Raspberry Pi is a good starting point for home and
industry automation prototypes
 Because >>
 Ease of Use
 Cost Effective
 Can be programmed easily to do
powerful things

20. Pi Onboard Camera Module
 Enables pi to see things around

21. About the camera
 Sensor type: OmniVision OV5647
 Sensor size: 3.67 x 2.74 mm
 Pixel Count: 2592 x 1944
(5megapixel)
 Pixel Size: 1.4 x 1.4 um
 Video: 1080p at 30 fps with codec
H.264
 Connects to Raspberry via CSI
interface

22. Using camera to capture
images
 raspistill [options]
 -?, --help : This help information
 -o, --output : Output filename
<filename>
 -v, --verbose : Output verbose
information during run
 -d, --demo : Run a demo mode (cycle
through range of camera options, no
capture)
 -sh, --sharpness : Set image sharpness
(-100 to 100)

23. More options
 -ex, --exposure : Set exposure mode
 Exposure mode options :
auto,night,nightpreview,backlight,spotli
ght,sports,snow,beach,verylong,fixedf
ps,antishake,fireworks

24. Video options
 raspivid [options]
 -o, --output : Output filename
<filename>
 -t, --timeout : Time (in ms) to capture
for. If not specified, set to 5s
 Example USAGE: raspivid –o
sample.mp4

25. Pi Relay Module
 Lets control the world of Alternating
Current AC

26. Mapping from PI to Relay
 5V output from Pi to VCC pin of Relay
 Ground to Ground of relay
 {
GPIO => Relay
}
We can use any GPIO as long as it is
not meant for other purposes