Published November 6, 2015 © Apache-2.0

FEZ HAT, Windows 10 IoT Core and Azure IoT Hub

It is very basic application how to use sensors on FEZ HAT for Raspberry Pi and Azure IoT Hub. You can use this concept for IoT projects.

IntermediateFull instructions provided5,435

FEZ HAT, Windows 10 IoT Core and Azure IoT Hub

Things used in this project

Hardware components

Raspberry Pi 2 Model B

FEZ HAT

Software apps and online services

Microsoft Windows 10 IoT Core

Microsoft Visual Studio 2015

Microsoft Azure

Story

FEZ HAT, Windows 10 IoT Core and Azure IoT Hub

It is very basic application how to use sensors on FEZ HAT for Raspberry Pi and Azure IoT Hub. You can use this concept for projects using Raspberry Pi 2, Windows 10 IoT Core and Azure IoT Hub.

FEZ HAT

FEZ HAT is Raspberry Pi HAT with couple of sensors, H-bridge, LEDs and more. Here is full specification. We will use just temperature sensor in our sample to show basics of W10 IoT Core and Azure IoT Hub.

How to setup FEZ HAT

I expect you have Raspberry Pi 2 running Windows 10 IoT Core and FEZ HAT connected.

1. Create Windows UWA

2. Install FEZ HAT library GHIElectronics.UWP.Shields.FEZHAT using NuGet

3. Configure remote debugging

4. Add library reference to your code

using GHIElectronics.UWP.Shields;

Now you are ready to work with FEZ HAT.

Azure IoT Hub

Azure IoT Hub allows you to managed devices and get messages from devices or send messages to devices. To process messages, you will use your own application or another Microsoft Azure service called Stream Analytics. I will describe Stream Analytics later. All services should be in same resource group.

1. Login to Microsoft Azure Portal and switch to Azure Preview Portal

2. Click New and choose Internet of Things – Azure IoT Hub

3. Choose Name, Pricing and Resource Group. You can have one free tier.

Your IoT Hub is ready now.

Data Storage

There more ways how to process data. We will use very simple one. We put all data to Azure Table Storage.

Azure Table Storage

1. Click New and choose Data + Storage – Storage Account

2. Choose Name and same Resource Group where you put Azure IoT Hub.

Now is your storage ready.

How to put it together

We have device connected to Azure IoT Hub on one side and Table Storage on another side. Stream Analytics service can take data from Input, process it (Query) and send it to Output. There can be more inputs and outputs.

1. Click New and choose Internet of Things – Stream Analytics Job.

2. Chose Name and Resource Group

3. Configure Input to use your Azure IoT Hub. You find all keys in Azure IoT Hub settings.

4. Configure Output to use Table Storage. You find all keys in Table Storage settings. Critical is PartitionKey and RowKey. You must use field name of object you will send in JSON format from device. If you check source code of example it will be clear to you.

5. Create Query to read data from input and send it to output with no change.

6. Start Job

Now is your Cloud infrastructure ready and working.

Working with device

You must register every single device to get access key. It is recommended do not share one access key for more devices. Easiest way how to register device is to use sample application DeviceExplorer. You will need iothubowner connection string to manage your devices.

Now you can start coding.

Simple application sending temperature to Table Storage

1. Install Microsoft.Azure.Devices.Client library using NuGet

Source code

If you run example code on Raspberry Pi 2 with Windows 10 IoT Core you can use DeviceExplorer tool to check messages and you should see data in Table Storage.

MainPage.xaml.cs

using System;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;

using Microsoft.Azure.Devices.Client;
using GHIElectronics.UWP.Shields;
using System.Text;

namespace IoTHUB101
{
    public sealed partial class MainPage : Page
    {
        // device connection string
        private const string _deviceConnectionString = "HostName=stepanb.azure-devices.net;DeviceId=stepanb-rpi-01;SharedAccessKey=xxxxxxx=";
        // object for device to 
        private DeviceClient _deviceClient = null;
        // FEZ HAT
        private FEZHAT _hat = null;
        // Timer for data reading
        private DispatcherTimer _timer = null;

        public MainPage()
        {
            this.InitializeComponent();

            _deviceClient = DeviceClient.CreateFromConnectionString(_deviceConnectionString, TransportType.Http1);
            SetupHAT();

            this._timer = new DispatcherTimer();
            // check how meny messages you can send in your pricing tier
            // every 5 minutes is 288 message per day so it will work for 10 devices in Free tier
            this._timer.Interval = TimeSpan.FromMinutes(5);
            this._timer.Tick += _timer_Tick;
            this._timer.Start();
        }
        private async void _timer_Tick(object sender, object e)
        {
            if (_hat == null)
            {
                return;
            }

            // message, check filed names and Stream Analytics Output configuration
            string msg = "{deviceId: 'stepanb-rpi-01',timestamp: " 
                + DateTime.Now.Ticks 
                + ",temperature: " 
                + _hat.GetTemperature().ToString() + "}";

            // prepare message
            Message eventMessage = new Message(Encoding.UTF8.GetBytes(msg));
            // send message
            await _deviceClient.SendEventAsync(eventMessage);
        }

        private async void SetupHAT()
        {
            // connect to FEZ HAT
            _hat = await FEZHAT.CreateAsync();
        }
    }
}

Credits

Štěpán Bechynský

8 projects • 30 followers

Internet of Things, Arduino, Microsoft, ex-Microsoft MVP

FEZ HAT, Windows 10 IoT Core and Azure IoT Hub

Things used in this project

Hardware components

Software apps and online services

Story

FEZ HAT, Windows 10 IoT Core and Azure IoT Hub

FEZ HAT

How to setup FEZ HAT

Azure IoT Hub

Data Storage

Azure Table Storage

How to put it together

Working with device

Simple application sending temperature to Table Storage

Source code

Code

MainPage.xaml.cs

Credits

Štěpán Bechynský

Comments

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FEZ HAT, Windows 10 IoT Core and Azure IoT Hub

FEZ HAT, Windows 10 IoT Core and Azure IoT Hub

Things used in this project

Hardware components

Software apps and online services

Story

FEZ HAT, Windows 10 IoT Core and Azure IoT Hub

FEZ HAT

How to setup FEZ HAT

Azure IoT Hub

Data Storage

Azure Table Storage

How to put it together

Working with device

Simple application sending temperature to Table Storage

Source code

Code

MainPage.xaml.cs

Credits

Štěpán Bechynský

Comments

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