Azure IoT Hubs with Raspberry Pi and Node.js

Raspberry Pi + Azure IoT Hubs + Node.js – Pete Gallagher – PJG Creations - 2018Raspberry Pi + Azure IoT Hubs + Node.js – Pete Gallagher – PJG Creations - 2018
Microsoft Azure IoT Hubs
with Raspberry Pi and
Node.js
PETE GALLAGHER
PJGCREATIONS.CO.UK
06/02/2018

About Me
Pete Gallagher
@PJGCreations
www.PJGCreations.co.uk
Pete@PJGCreations.co.uk
• IT Consultant
• Decades of Desktop, Web & Embedded
Software experience
• Gadget Addict

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

What we’re going to be doing…
Some coding
Introduction to Azure’s IoT Offering
Lots more coding
Message Routing and Azure Logic Apps
Other cool IoT Tech from Particle and MX Chip
Q&A
Closing…

What is IoT?

The Connected Cow

 Oestrus only lasts between 12-18 hours….
 Only once per 21 days
 Normally occurs between 10pm and 8am
 Traditionally detected by visual monitoring
 70% Conception Rate
 Only 55% probability of correctly identifying oestrus
 Pregnancy Rate of 39%
The Connected Cow

The Connected Cow
“To identify a cow in heat, you need to
spend at least 20-30 minutes in the stables
per day, four to five times a day”

The Connected Cow
“How can this be improved with
technology?”

The Connected Cow
12th
1am
12th
9am
12th
5pm
13th
7am
13th
9am
13th
5pm
STEPS
16 hours later
Start of Oestrus Optimum for Artificial Insemination

The Hardware you’ll need…
Raspberry Pi B+
Upwards with
Node.js 4.0+
Some
Components
A BreadBoard Some Wires
Raspberry Pi + Azure IoT Hubs + Node.js – Pete Gallagher – PJG Creations - 2018

The Software you’ll need…
Visual Studio
Code
An SSH Client A Web Browser An Azure
Subscription
> _

http://bit.ly/nottsdevvscodeVisual Studio Code
http://bit.ly/nottsdevputtyAn SSH Client
Any!A Web Browser
http://bit.ly/nottsdevfreeazureAn Azure Subscription
The Software you’ll need…

Let’s Get Started…

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

Connecting to the Raspberry Pi
LETS GET TOGETHER

If you’re using a Mac…
 Connect your Network cable from the Pi to your Mac
 Enable Internet Sharing by going to System Preferences -> Sharing
 Select “Internet Sharing” on the left
 In “Share your connection from:”, select your Wifi connection
 In “To computers using:” select “Thunderbolt Ethernet” & “Thunderbolt Bridge“ Connections
 Click Start On Sharing when Selecting both.
 Open System Preferences -> Network and Select “Thunderbolt Ethernet”
 From “Configure IPv4:”, select “DHCP” if not already selected
 You should see “Status:” says “Connected” at the top, and below DHCP YOUR “IP Address”
 Go to “Applications -> Utilities -> Terminal”
 Enter “ifconfig” and look for the Connection starting “Bridge”
 Look for the line starting “inet” and find the IP Address. e.g. 192.168.3.1
 Pi will be next IP Address in sequence. e.g. 192.168.3.2
 Enter SSH pi@192.168.3.2
 Accept the certificate it required

Flashing Our LED’s
TIME FOR SOME CODING!

git reset --hard origin/master
git checkout 01_flash_leds
Flashing our LED’s
If you want to cheat…

Using the Config File
WE DON’T LIKE NUMBERS

Using the Config File
git checkout 03_use_config

Adding a Button
FLASHING IN A LOOP IS BORING

Adding a Button
git checkout 04_add_button

What is the Azure IoT Hub
HUH?

What is the 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 MILLIONS of 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
Messages
(Per Day Per Unit)
Message
Meter Size
Free Free 500 8,000 0.5KB
S1 £37.27 Unlimited 400,000 4KB
S2 £372.66 Unlimited 6,000,000 4KB
S3 £3,726.55 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
git checkout 05_connect_to_iot_hub
You need to create you security.json
{ "SharedAccessKey": "your.access.key" }
Then modify your config.json

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

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

Sending a Message to the IoT Hub
git checkout 06_send_iot_hub_msg

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

Sending a Message to the IoT Hub…
Using a Button
git checkout 07_send_msg_on_button

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

Receive Cloud to Device Messages
ARE YOU LISTENING TO ME?

Receive Cloud to Device Messages
git checkout 08_receive_msg

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

Invoke a Method on the Device
git checkout 09_invoke_method

Add in the Temperature Sensor
IS IT HOT IN HERE?

git checkout 10_add_BME

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

git checkout 11_add_routes

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: @PJGCreations
Email: Pete@PJGCreations.co.uk
Slides (To Follow): http://bit.ly/nottsdeviothubslides
Getting Started: http://bit.ly/nottsdeviotinitialsetup
Code: http://bit.ly/NottsDevIoTHubCode
Video (To Follow): http://bit.lynottsdeviothubvideo

Resources
Azure Dev Guide: http://bit.ly/NottsDevAzureDevGuide
IoT Hub Learning Path: http://bit.ly/nottsdeviothublearning
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 –g iothub-explorer
iothub-explorer
Device Explorer (Windows): http://bit.ly/nottsdevdevexplorer
Device Discovery (Node): http://bit.ly/nottsdevdevicediscovery
npm install –g device-discovery-cli
devdisco list –eth
IoT Hub Diagnostics Tool: http://bit.ly/nottsdevdiagnostics
npm install –g iothub-diagnostics
iothub-diagnostics <IoTHub Connection String>

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

Further Viewing
The Connected Cow: http://bit.ly/nottsdevconnectedcow
http://bit.ly/nottsdevconnectedcowfd
MVA Introduction to IoT: http://bit.ly/nottsdevmvaiot
Azure Friday Azure IoT Hub: http://bit.ly/nottsdevazurefriday
Azure IoT Deep Dive: http://bit.ly/nottsdevazuredeepdive

Questions?

What could possibly go
wrong?

Azure IoT Hubs with Raspberry Pi and Node.js

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