HOME AUTOMATIONwith Netduino, Windows Azure

Service Bus, and Windows Phone 7

By Mike Linnen

Introduction

Blog: http://www.protosystem.netTwitter: @mlinnenEmail: mlinnen@protosystem.net

Outline

Home Automation Vision Netduino Azure AppFabric Service Bus Windows Phone 7 What’s Next

Vision

Lawn Sprinkler Goals

Replace legacy sprinkler Current system is overly complicated

Conserve on Water Never have to worry about setting the

clock Remotely control the sprinkler

Current Sprinkler

Demo

Manual operation of Sprinkler Windows Phone 7 operation of Sprinkler Weather Service

Sprinkler Scheduled to go on but rain is in the forecast

Sprinkler Scheduled to go on but rain is not in the forecast

Time Service Powershell

Data Flow – WP7 to Sprinkler

Data Flow – Weather Service to Sprinkler

Data Flow – Time Service to Sprinkler

Alarm Clock

Review the Hardware

Netduino Products

http://www.netduino.com/ Open-source Hardware Open-source .Net Micro Framework

4.1 Released 4.2 Beta

Atmel based processor 3 Products

Netduino – Pin compatible with Arduino Netduino Plus – Pin compatible with Arduino Netduino Mini – Pin compatible with BS2

Extending Netduino Hardware

Use Arduino Shields to bolt on hardware solutions

Stackable Shields Prototype/Breadboard Shield Data logging Shield Ethernet Shield Motor Shield Relay Shield Build your own Shield Joystick Shield

NetduinoSpeed 48 mhz

Flash Memory 128 kb

Ram 60 kb

Digital I/O 20

Interrupts 20

Analog 6 x 10 bit

PWM 4 x 16 bit

I2C 1

SPI 1

Ethernet No

SD Card No

USB 1

Serial 2 x TTL

User LED 1

User Switch 1

Netduino PlusSpeed 48 mhz

Flash Memory 64 kb

Ram 28 kb

Digital I/O 20

Interrupts 20

Analog 6 x 10 bit

PWM 4 x 16 bit

I2C 1

SPI 1

Ethernet 1 10/100

SD Card 1 Micro SD

USB 1

Serial 2 x TTL

User LED 1

User Switch 1

Netduino MiniSpeed 48 mhz

Flash Memory

152 kb

Ram 64 kb

Digital I/O 16

Interrupts 16

Analog 4 x 10 bit

PWM 4 x 16 bit

I2C 1

SPI 1

Ethernet No

SD Card No

USB No

Serial 1 x TTL 1 x RS232

User LED No

User Switch No

Why use Netduino?

One language (C# or VB.Net) across all devices

Visual Studio IDE Unit Testing or SpecFlow Debug code that is running on the device Mostly compatible with Arduino Shields

Breadboard

Schematic

Driving High Current Loads

Driving High Current Loads

Pull Down Resistor Added

Netduino is 3.3v not 5v

3.3 Volts

5 Volts

1.2 Volts

5 – 3.3 = 1.7

Use 3.3v Instead of 5v

I need help with Electronics

Arduino focused resources Ladyada http://bit.ly/4JuEvR Tronixstuff http://bit.ly/donqS6

I need help with Programming

Getting Started with the Internet of Things http://oreilly.com/catalog/0636920013037

Netduino Forums http://netduinohelpers.codeplex.com/ Expert .Net Micro Framework Apres

Parts

Local parts Radio shack Frys Electronics (off of 85 on the way to

Atlanta) Jameco http://www.jameco.com Digikey http://www.digikey.com/ Adafruit http://www.adafruit.com/ Sparkfun http://www.sparkfun.com/ Servo City http://www.servocity.com/ MakerShed http://www.makershed.com/

Fritzing

Opensource Breadboard wiring Schematic Drawing Printed Circuit Board Design

Fritzing Demo

Create a breadboard design Review the schematic Review the Printed Circuit Board design

.Net Gadgeteer

http://netmf.com/gadgeteer/

Getting into Code

Debug Demo

Launch the Sprinkler Set breakpoints Walk through code

MF Testing Techniques

Unit Testing Mocking SpecFlow Integration Testing (Skip)

Unit Testing Frameworks

Limited options for .Net MF Nunitlite http://nunitlite.com/

Current Release 0.5 .Net MF Support coming in 0.9

Nunit (or any other testing framework) Using Linked files My Blog Post http://bit.ly/dM9nlf Moq (or any mocking framework) SpecFlow (or any BDD framework)

Design for Testability

Unit TestsSpecFlow

Mocks

Integration Tests

Demo Netduino Unit Testing

Project structure for Netduino code Unit Testing Harness

Link files SpecFlow execution Code Coverage Execution

Sprinkler

Web ServerSprinkler Scheduler

Demo Sprinkler Code

Home Connector

Service Bus HostMessage Processors

Azure AppFabric Service Bus 1.0

Service Registry (naming and discovery) Message Buffer (no reliability guarantees) Remoting HTTP REST Capable Traverses Firewall Expose on Premise Web Services or Data

Azure AppFabric Service Bus CTP

Reliable Message Delivery Load Balancing/Partitioning Queues (deprecating Message Buffers)

REST interface Groups, Sessions, Dead-lettering, No TTL 1 GB Queue and 256 k Message Size

Topics Publish/Subscribe Subscriptions can have Filters and Actions Multiple Subscribers

Relies on AppFabric Access Control for securing endpoints Claims based security

CTP Topics

P TOPIC

S

S

S

C

C

C

C

C

Cost

Azure Cost Calculator http://bit.ly/m9xGfz NOTE: This info might not be up to

date $3.99 per connection on a “pay-as-you-

go” basis (max # connections in a day) Pack of 5 connections $9.95 Pack of 25 connections $49.75 Pack of 100 connections $199.00 Pack of 500 connections $995.00

Cost

Getting Started

http://www.microsoft.com/windowsazure/sdk/

Access Control

Service BusCaching

Azure Platform

Azure Account

Sign up (use your MSDN) Access the Azure Management Portal Create a Service Namespace Get your Default Key

Code: Service Bus

3 Simple Steps 1. Define the Service Contract

What do you want to expose over the SB?

2. Implement the SC3. Host the Service

Done!!!Note: app.config

Home Connector MSG Processor

Forwards messages to specific devices 1 or more devices might receive the same

message Example: Set Clock goes to sprinkler and

alarm clock Service Bus ConfigurationRepository

places sensitive connection info in a runtime file to keep it out of source control

Needs more work to be a Pub/Sub model

Remote Connector

HTTP/JSONService Bus Client

Exposing SB to WP 7

Why? Service Bus cannot be used directly on WP 7

Maybe Message Buffer REST API? More Clients (like iPhone or Android) Expose Service Bus using HTTP REST Intro to RemoteConnector.Web

Simple JSON msg processor that calls the Service Bus

Can be hosted multiple ways Azure Self Host Shared Hosting Provider

NancyFX

https://github.com/NancyFx/Nancy Alternative Light weight Web Framework Can be used in place of ASP.NET MVC Is not dependent on ASP.NET Easy to get up and running fast Easy to configure routes

Demo & Code

Sprinkler Status via Browser Review the SprinklerModule and NancyFX Review how the Service Bus is called Show Web.Config

bindingExtensions are required when AppFabric SDK is not installed

WP 7 Remote Controller

Sends HTTP Requests to the RemoteConnector Web Site HttpWebRequest

Uses Caliburn Micro as the MVVM Framework

Watch out for web request/response caching Your request to the RemoteConnector will be

cached on the phone if you don’t change query string parms for every request.

Keep the messages small

Home ServicesCloud Services

Date TimeWeather

Date Time Service

Get’s the current time Sends the time via Service Bus

Weather Service

Gets the current weather forecast Sends the forecast via Service Bus

Simple Service Bus Client

Show MessageBusClient Show Sprinkler.ConsoleClient Show App.Config

bindingExtensions are required when AppFabric SDK is not installed

What was hard

JSON Parsing between .Net Frameworks DateTime in particular Instead of using native DateTime I used a string with a

special format MF JSON parsing is painful

Look at http://netduinohelpers.codeplex.com/ for a better solution

Figuring out WP 7 UI Design Getting the Service Bus working on a Non

Development machine. Config settings

Building a stand alone sprinkler complete with an LCD and Keyboard and all the menus associated with it for setting up the schedule

What was easy

Getting the Service bus going in Development

Nancy as a Web Framework Debugging Sprinkler Code on Netduino as

opposed to other embedded alternatives Having Unit Tests and SpecFlow Tests for

the Sprinkler

Moving to a Service Based Model

Simplify Embedded LogicScheduling

Why Service Base Model

Changing software on the embedded device is time consuming This is especially true after the device is

deployed Complex business logic is easier to do in

the Full .Net Framework The scheduling logic could be enhanced

to support a lot more options The scheduling service could be used by

other Home Automation Enthusiasts

What is Next

Secure the communications Install the sprinkler and let it run Remove the continuous DateTime updates

The sprinkler should be able to request DateTime update on power up

The service sends the update less frequently and only when daylight savings changes

Remove the continuous Weather updates The sprinkler should be able to request the

forecast update on power up The weather service should send new forecast

when it changes

Done

YOU CAN DO IT!

https://bitbucket.org/mlinnen/lawnsprinklerhttp://www.protosystem.net/