This document is a webinar presentation on building IoT prototypes using Raspberry Pi and PubNub. It covers topics such as sending and receiving data, wiring components, programming LEDs, and creating a remote-controlled LED interface. Additionally, it provides resources for further learning and examples of practical use cases for IoT applications.

1. [Feb 2016] A Special Webinar for Forward4
Internet of Things 101:
Building IoT Prototypes w/ Raspberry Pi
Tomomi Imura (@girlie_mac)

2. Tomomi
(@girlie_mac)
● Lead Dev Evangelist at PubNub
● Front-End Dev
● ❤ Hardware hacking
● Cat Lady of the InterWeb

3. What You Will Learn Today
1. Internet of Things and Data Stream
2. How to send & receive data with PubNub using Python
3. How to wire a LED & resistor to Pi using breadboard
4. How to program Pi to blink the LED
5. Making it IoT : Remote-controlled LED from web interface

4. Era of Internet of Things
Source: PLATFORM, data based on Cisco IBSG
Estimate 50B by 2020
non-human/human = 6.58
2003:
non-human/human = 0.08
2015:
non-human/human = 3.47
2008:
non-human/human >= 1

5. Withings: Smart Body Analyzer
GE Link
Cinder
Sensing Cooker
Nest: Learning
Thermostat
Whistle: Connected pet collar
Amazon
Dash Button
Smart Devices

6. Smart-Ass Devices :-D

7. Internet of Things
………
Bluetooth

8. Internet of Things with
Data Stream
Send & Receive Data to/from Data
Center via Internet

9. PubNub Data Stream
Two-way communication to/from every device in the world.
https://pubnub.com
Realtime Reliable Secure
PubNub is globally distributed realtime data stream
network (DNS)

10. PubNub Use-Cases
◼ Chat (Periscope)
◼ Multi-player games (DeNA games)
◼ Vehicle Location Tracking (Lyft, GetTaxi)
◼ Financial data (TD Ameritrade)
◼ Collaborative teaching tools (ClassDojo, CodePen)
◼ IoT, Smart Home (Insteon, Logitech)

11. Prototyping Internet of
Things
Send & Receive Data to/from Data
Center via Internet
LED

12. 6. USB TO POWER SOURCE 5. TO MONITOR
4. TO MOUSE
3. TO KEYBOARD
2. WI-FI ADAPTER
1. SD CARD
Getting Started with
Raspberry Pi

13. https://github.com/pubnub/
workshop-raspberrypi

14. Raspbian OS

15. SSH into your Rasp Pi
1. Get your Raspberry Pi’s IP address
pi@raspberrypi ~$ hostname -I

16. 2. SSH to Pi from your laptop
(Terminal on Mac/Linux, PuTTY on Windows):
me@MyMac ~$ ssh pi@10.96.70.1
SSH into your Rasp Pi
Use your Pi’s IP!
Your Pi’s username
If SSH-ing fails, try:
$ sudo raspi-config
on your Pi

17. Programming Rasp Pi
Pre-installed on Raspberry Pi:
C / C++

18. Get Started w/ Python
Update your system first
~$ sudo apt-get update
~$ sudo apt-get upgrade
Install python and pip
~$ sudo apt-get install python-dev
~$ sudo apt-get install python-pip

19. Wut, you want Node.js?
~$ wget
http://node-arm.herokuapp.com/node_latest_
armhf.deb
...but we’re using python today!
Don’t worry, I’m a JS dev too :-)

20. Installing PubNub
~$ sudo pip install pubnub

21. https://github.com/pubnub/
workshop-raspberrypi/tree/master/
projects-python/helloworld
Hello World w/ PubNub

22. Hello World w/ PubNub
Import & init (hello.py)
import sys
from pubnub import Pubnub
pubnub = Pubnub(publish_key='demo',
subscribe_key='demo')
Use your own publish
& subscribe keys!

23. Hello World w/ PubNub
Publish (Sending data)
channel = 'hello-pi'
data = { 'username': 'Grumpy Cat',
'message': 'Hello world from Pi!'}
def callback(m):
print(m)
pubnub.publish(channel, data, callback=callback,
error=callback)

24. Hello World w/ PubNub
Run your program
~$ sudo python hello.py

25. Debug Console
http://pubnub.com
/console/
1. channel: hello-pi
2. pub key: demo
3. sub key: demo

26. https://github.com/pubnub/
workshop-raspberrypi/tree/master/
projects-python/led
Hello World of Hardware:
Blinking LED

28. 1. Raspberry Pi 2 (w/ a WiFi Adapter for later exercise)
2. 1 Breadboard
3. 2 Male/Female jumper wires, 2 colors
4. 1 Resistor (200Ω)
5. 1 LED (1.9 - 3.2V)
What you need

30. OMG Physics!
Cathode (-) Anode (+)
- +
1.9V 3.2V
- +

31. OMG Physics!
R =
V - Vs f
I
source voltage (V) forward voltage (V)
(LED voltage drop)
current thru
the LED (A)
resistance (Ω)

32. OMG Physics!
R =
3.3v - 1.9v
0.02 A
source voltage (V)
forward voltage (V)
(Red LED voltage drop)
current thru
the LED (A)
resistance (Ω)
= 70 Ω

33. 4-band Resistor Color Code
47 x 100 =
4.7 k Ohms
4 7 102 +/- 5%
multiplier
tolerance
Learn more at: https://learn.adafruit.com/multimeters/resistance

34. 5-band Resistor Color Code
200 x 1 =
200 Ohms
2 0 100 +/- 1%
multiplier
tolerance
Learn more at: https://learn.adafruit.com/multimeters/resistance
0

35. Breadboard
400-pinMini
We are using this kind today!
You may find this
type of breadboard
when googling
circuits. They have
power rails that
goes vertical!
not connected !
An electronics breadboard is a fundamental tool to build circuits. It is solderless, and great tool for
prototyping.
conductive metal
strips goes
horizontally
Connected!

36. Turning LED on
3.3V
(Raspberry Pi)
LED

37. Turning LED on
3.3V (Pin 1)
GND
Anode (longer
leg)
Cathode

38. Raspberry Pi 2 Pins
3.3V
Ground
GPIO (general purpose input output)

39. Programming LED
GPIO-4 (Pin 7)

40. Programming LED
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
LED = 4
GPIO.setup(LED,GPIO.OUT)
for i in range(6):
GPIO.output(LED,True)
time.sleep(0.5)
GPIO.output(LED,False)
time.sleep(0.5)
import RPi.GPIO libs
set pin type. use BCM, not pin number
GPIO 4 pin (Pin 7)
set LED pin as output
toggle light pin signal to low/high to
make it blink.
7 times.

41. https://github.com/pubnub/
workshop-raspberrypi/tree/master/
projects-python/remote-led
Making it IoT:
Remote-Controlled LED

42. Making it IoT:
Remote-Controlled LED
publish data subscribe data

43. Publishing data from a web client
var pubnub = PUBNUB.init({
subscribe_key: 'demo',
publish_key: 'demo'
});
button.addEventListener('click',
function(){
pubnub.publish(
{channel: 'disco',
message: {led: 1}}
);
});
Making it IoT:
Remote-Controlled LED
When the button is
clicked on browser, it
publishes data, {‘led’: 1}

44. Subscribing data to Raspberry Pi
pubnub = Pubnub(publish_key='demo', subscribe_key='demo')
channel = 'disco'
def _callback(m, channel):
if m['led'] == 1:
for i in range(6):
GPIO.output(LED_PIN,True)
time.sleep(0.5)
GPIO.output(LED_PIN,False)
time.sleep(0.5)
pubnub.subscribe(channels=channel, callback=_callback, error=_error)
Making it IoT:
Remote-Controlled LED
button.addEventListener
('click', publish);
As soon as a message is
published from a browser,
the message is subscribed
to Pi

45. Disco!
http://pubnub.github.io/
workshop-raspberrypi/web/disco.html
Making it IoT:
Remote-Controlled LED

46. IoT & PubNub
Case Study: Insteon
http://www.insteon.com

47. Data Visualization with
Temperature Sensor
It uses a capacitive humidity sensor and a thermistor to
measure the surrounding air, and spits out a digital signal on
the data pin.
https://github.com/pubnub/workshop
-raspberrypi/tree/master/projects-pyt
hon/dht22
http://pubnub.github.io/workshop
-raspberrypi/web/temperature.ht
ml

48. Realtime Data Graphs & Charts
https://github.com/pubnub/eon-chart

49. Resources
◼ Raspberry Pi - https://www.raspberrypi.org/
◼ PubNub - https://pubnub.com
◼ Step-by-step instructions & Code sample on GitHub -
https://github.com/pubnub/workshop-raspberrypi
◼ This slide deck: https://goo.gl/NHIkJe

50. Thank you :-)
Tomomi Imura (@girlie_mac)
https://www.pubnub.com/blog/author/tomomi/
http://girliemac.com
Tuts+ Node.js & Arduino tutorial: http://goo.gl/LTtPn4

51. Creative Commons Attributions
◼ LED circuit: Wikimedia
◼ GPIO Pins: RaspberryPi-Spy.co.uk
Also, great public domain images from Pixabay, and an
open-source software, Fritzing for circuit diagrams!