Azure IoT Hubs with Raspberry Pi and Node.js - Azure Bootcamp - 27-04-19

Raspberry Pi + Azure IoT Hubs + Node.js – Pete Gallagher – PJG Creations - 2019
http://bit.ly/nottsiotvscodeVisual Studio Code
http://bit.ly/nottsiotputtyAn SSH Client
Any!A Web Browser
http://bit.ly/nottsiotvsessentialsAn Azure Subscription
Prerequisites:
Microsoft Azure IoT Hubs with Raspberry Pi and Node.js
http://bit.ly/nottsiotiotdeviceexplorer
Azure IoT Device
Explorer Twin

Microsoft Azure IoT Hubs
with Raspberry Pi and
Node.js
PETE GALLAGHER
PJGCREATIONS.CO.UK
27/04/2019

About Me
Pete Gallagher
@pete_codes / @PJGCreations
www.PJGCreations.co.uk
Pete@PJGCreations.co.uk
IT Consultant
Decades of Desktop, Web & Embedded Software experience
Meetup Organiser
STEM Ambassador … Gadget Addict
Father of two inquisitive girls

What we’re going to be doing…
Basic understanding of IoT
The Hardware we’re using
The Software we’re using
GPIO and a description of the Circuit
Connecting to the Raspberry pi

What we’re going to be doing…
Introduction to Azure’s IoT Offering
Message Routing and Azure Logic Apps
Q&A
Closing…

What is IoT?

The Hardware we’re using…
Raspberry Pi B+
Upwards with
Node.js 6.0+
Some
Components
A BreadBoard Some Wires

The Software we’re using…
Visual Studio
Code
An SSH Client A Web Browser An Azure
Subscription
> _

GPIO and the Circuit
LET’S GET HANDS ON

Raspberry Pi GPIO

Our Circuit and Parts
Part Qty
Breadboard 1
Red LED 1
Green LED 1
220Ω Resistor 2
Push Button 1
BME280 1
Jumper Wires 11

Step 1
The Raspberry Pi
 This is the heart of our circuit
and will be controlling how all of
the electronics work as well as
running our code.

Step 2
Grab a Breadboard
 This is what we’ll be using to
connect all of our components
together

 Insert the Red LED with it’s
shortest leg to the outside of the
breadboard, and it’s longest leg
to the hole next to it.
 Don’t worry about making it
look the same!
 LED’s have a polarity and only
work one way round.
Step 3
Add the Red LED

Step 4
Connect LED Ground
 Add a Purple Wire from the Red
LED short Leg to Pin 9 (Ground /
0v) .
 This is one side of the circuit to
light the Red LED.

 Connect a resistor between the
Red LED Long Leg hole and the
adjacent hole.
 This limits the current to the
LED, preventing the Pi Pin from
burning out.
Step 5
Add a 220Ω Resistor

Step 6
Connect Red LED
 Connect an Orange Wire to the
hole on the empty side of the
Red LED Resistor to Pin 10
(Wiring Pi Pin 16)
 This is the control to turn our
Red LED On and Off

Step 7
Add Green LED
 Insert the Green LED with it’s
shortest leg to the outside of the
breadboard
 It’s the same column as the Red
LED
 Insert it’s longest leg into the
hole next to the Red LED
Resistor.

Step 8
Add a 220Ω Resistor
 Connect a resistor between the
Green LED Long Leg hole and
the adjacent hole.
 This limits the current to the
LED, preventing the Pi Pin from
burning out.

Step 9
Connect Green LED
 Connect a Grey Wire to the hole
on the empty side of the Green
LED Resistor to Pin 11 (Wiring Pi
Pin 0)
 This is the Control to turn our
Green LED On and Off

Step 10
Add a Button
 Connect the Button between the
two sides of the Breadboard
 It will only fit in one orientation!
 Don’t force it!

Step 11
Add Button Control
 Connect a White Wire from the
Right Hand Button Leg Hole to
Pin 26 (Wiring Pi Pin 11)
 This is one side of our Button
Circuit, and how we’re going to
sense if the Button has been
pressed.

Step 12
Add Button Ground
 Connect a Black wire from the
Left Hand Button Leg Hole to
Pin 25 (Ground / 0v)
 This is the other side of our
Button Circuit.

Step 13
Add the BME280
 This is our Temperature /
Humidity / Pressure Sensor
 Insert the BME with the body
overlapping the gap, and the
pins in the bottom half of the
breadboard.

Step 14
Add BME280 Power
 Connect a Red Wire from the left
most BME280 Pin Hole to Pin 1
(3v)
 This supplies the power for the
Sensor.

Step 15
Add BME280 Ground
 Connect a Brown Wire from the
Pin Hole to the right of the Red
Wire to Pin 6 (Ground / 0V)
 This is our 0v and part of the
power to the BME280

Step 16
Add BME280 Clock
 Connect a Yellow Wire from the
Pin Hole to the right of the
Brown Wire to Pin 23 (Wiring Pin
14 / SCLK)
 This is the clock for the SPI
(Serial Peripheral Interface)

Step 17
Add BME280 Serial In
 Connect a Grey Wire from the
Pin Hole to the right of the
Yellow Wire to Pin 19 (Wiring Pi
Pin 12 / MOSI)
 This is the Serial Data from the
BME280 to the Raspberry Pi

Step 18
Add BME Chip Enable
 Connect a Green Wire from the
Pin Hole to the right of the Grey
Wire to Pin 24 (Wiring Pi Pin 10 /
CE0)
 This allows the Raspberry Pi to
Enable the BME280 in case there
are multiple SPI devices
connected

Step 19
Add BME280 Serial Out
 Connect a Blue Wire from the far
right Pin Hole to the right of the
Yellow Wire to Pin 21 (Wiring Pi
Pin 13 / MISO)
 This is the Serial Data from the
Raspberry Pi to the BME280

Let’s Get Started…

Instructions:

Instructions:
Git Version:
http://bit.ly/pjg-azurebootcamp2019
Word Doc Version:
http://bit.ly/pjg-azurebootcamp2019-docx

Connecting to the Raspberry Pi
LETS GET TOGETHER

Flashing Our LED’s
TIME FOR SOME CODING!

Using the Config File
WE DON’T LIKE NUMBERS

Using the Config File
If you want to cheat…
git checkout 03_use_config

Adding a Button
FLASHING IN A LOOP IS BORING

Check that the circuit is working…
FLASH THOSE LIGHTS!

Adding a Button
If you want to cheat…
git checkout 04_add_button

What is an Azure IoT Hub
HUH?

What is an Azure IoT Hub?
 Provides Device to Cloud and Cloud to Device Messaging using a variety
of protocols including AMQP, MQTT, HTTP etc
 Based on Event Hubs… But allows for 2 way communications.
 Allows for 1 million simultaneous connections!
 Stores a Registry of each IoT Device
 Provides “Device Twin” functionality for Desired and Actual Properties
 Device libraries available in a host of languages including .NET, JavaScript,
Node.js etc
 Sits on the Edge of the Cloud between the IoT Devices and the full Azure
Stack
 Connects to Service Bus, Event Hubs, Blob Storage, Ai etc etc

R
E
S
O
U
R
C
E
S
F
I
E
L
D
IoT and Azure
I
O
T
H
U
BIoT Hub
AZURE

What does it cost?
Edition Price Per Unit
(Per Month)
Max Number of
Devices
Total Number of
(Per Day Per Unit)
Message
Meter Size
Free Free 500 8,000 0.5KB
S1 £18.63 Unlimited 400,000 4KB
S2 £186.38 Unlimited 6,000,000 4KB
S3 £1,863.273 Unlimited 300,000,000 4KB

A Real World Example…

Creating and Connecting to an Azure
IoT Hub
LET’S GET CONNECTED

Configuring and Connecting to an
Azure IoT Hub
You’ll need…
Azure IoT Device Explorer Twin
http://bit.ly/nottsiotdevexplorer

Azure IoT Hub
Follow along…
git checkout 05_connect_to_iot_hub
If a file is Read Only use…
cd..
sudo chmod 777 NottsDevIoTHub -R
cd NottsDevIoTHub

Azure IoT Hub
Create a file called security.json containing;
{ "SharedAccessKey": "" }

Using a VS Code extension in place of
the Device Explorer (or Node!)
ALL TOGETHER NOW…

Sending a Message to the IoT Hub
HELLO FROM THE OTHER SIDE

Sending a Message to the IoT Hub
Follow along…
git checkout 06_send_iot_hub_msg
cd..
cd NottsDevIoTHub

Sending a Message to the IoT Hub…
Using a Button
WE’RE IN CONTROL

Sending a Message to the IoT Hub…
Using a Button
Follow along…
git checkout 07_send_msg_on_button
cd..
cd NottsDevIoTHub

Receive Cloud to Device Messages
ARE YOU LISTENING TO ME?

Receive Cloud to Device Messages
Follow along…
git checkout 08_receive_msg
cd..
cd NottsDevIoTHub

Invoke a Method on the Device
DO WHAT I TELL YOU TO DO!

Invoke a Method on the Device
Follow along…
git checkout 09_invoke_method
cd..
cd NottsDevIoTHub

Add in the Temperature Sensor
IS IT HOT IN HERE?

Follow along…
git checkout 10_add_BME
cd..
cd NottsDevIoTHub

Routing Messages & the Service Bus
SAT NAV ENGAGED
THIS WAY

R
E
S
O
U
R
C
E
S
F
I
E
L
D
IoT and Azure
IoT plays nicely with Azure…
I
O
T
H
U
B
IoT Hub
Routes
Service bus
Queue
Topics
Relay

Follow along…
git checkout 11_add_routes
cd..
cd NottsDevIoTHub

Logic Apps
SPOCK WOULD BE HAPPY

R
E
S
O
U
R
C
E
S
F
I
E
L
D
IoT and Azure
IoT plays REALLY nicely with Azure…
I
O
T
H
U
B
IoT Hub
Routes
Service bus
Queue
Topics
Relay

What are Logic Apps?
 Provides a Graphical Interface to Hook together a bunch of Apps, Services,
Workflows and functions.
 No code required!
 REALLY cheap - £0.000019 per execution!
 Can hook together an almost unlimited combination of items to perform
just about any Workflow
 For example
 Twitter Timeline Sentiment Analysis - Populate Power Bi Dashboard to help
improve customer service
 Order Approval – Route order types to the correct people
 Monitor feedback forms and email the correct people

Links
Website: https://www.pjgcreations.co.uk
Twitter: @pete_codes / @PJGCreations
Email: Pete@PJGCreations.co.uk
Slides (To Follow): http://bit.ly/azurebootcamp2019-slides
Initial Circuit Setup: http://bit.ly/nottsdeviotinitialsetup
Instructions: http://bit.ly/pjg-azurebootcamp2019
Code: http://bit.ly/NottsDevIoTHubCode
Video (To Follow): http://bit.ly/nottsdeviothubvideo

Resources
Azure Dev Guide: http://bit.ly/NottsDevAzureDevGuide
IoT Hub Learning Path: http://bit.ly/nottsiotazureiotlearning
Azure IoT Hub Pricing: http://bit.ly/NottsDevIoTHubPricing
More Detailed Pricing: http://bit.ly/NottsDevIoTHubPricingDetail
IoT Hub with Arm Templates: http://bit.ly/nottsdevarmtemplates

Resources
IoT Hub with Azure Cli: http://bit.ly/nottsdevazurecli
Iot Hub with Powershell: http://bit.ly/nottsdevpowershell
Azure Logic Apps: http://bit.ly/nottsdevpowershell
Microsoft IoT Homepage: https://dev.windows.com/en-us/iot
Some Cool IoT Projects: https://www.hackster.io/windowsiot/

Tools
IoT Hub Explorer (Node): http://bit.ly/nottsdeviothubexplorer
npm install --global iothub-explorer
iothub-explorer
Device Explorer (Windows): http://bit.ly/nottsdevdevexplorer
Device Discovery (Node): http://bit.ly/nottsdevdevicediscovery
npm install --global device-discovery-cli
devdisco list –eth
IoT Hub Diagnostics Tool: http://bit.ly/nottsdevdiagnostics
npm install --global iothub-diagnostics
iothub-diagnostics <IoTHub Connection String>

More Tools
IoT Extensions for VS Code: http://bit.ly/nottsiottoolkit
Device Explorer (Windows): http://bit.ly/nottsiotdevexplorer

Further Viewing
The Connected Cow: http://bit.ly/nottsiotconnectedcow
http://bit.ly/nottsiotconnectedcowfd
MVA Introduction to IoT: http://bit.ly/nottsiotmvaiot
Azure Friday Azure IoT Hub: http://bit.ly/nottsiotazurefriday
Azure IoT Deep Dive: http://bit.ly/nottsiotazuredeepdive

Questions?

What could possibly go
wrong?

Azure IoT Hubs with Raspberry Pi and Node.js - Azure Bootcamp - 27-04-19

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