This repo contains the source code to help you get familiar with Azure IoT using the Azure IoT Adafruit Feather HUZZAH ESP8266 Starter Kit. You will find the lesson-based tutorials on Azure.com.

This repo contains an arduino application that runs on board feather HUZZAH ESP8266 with a DHT22 temperature&humidity sensor, and then sends these data to your IoT hub. At the same time, this application receives Cloud-to-Device message from your IoT hub, and takes actions according to the C2D command.

Follow this page to prepare your Azure IoT hub and register your device.

1. Start Arduino and open Preferences window.
2. Enter http://arduino.esp8266.com/stable/package_esp8266com_index.json into Additional Board Manager URLs field. You can add multiple URLs, separating them with commas.
3. Open Boards Manager from Tools > Board menu and install esp8266 platform 2.2.0 or later
4. Select your ESP8266 board from Tools > Board menu after installation

Install the following libraries from Sketch -> Include library -> Manage libraries

• AzureIoTHub
• AzureIoTUtility
• AzureIoTProtocol_MQTT
• ArduinoJson
• DHT sensor library
• Adafruit Unified Sensor

You can follow the image to connect your DHT22 with your feather HUZZAH ESP8266.

You can use the application to simulate temperature&humidity data and send to your IoT hub.

1. Open the app/config.h file.
2. Change the SIMULATED_DATA value from false to true.

Upload the app.ino to your board.

After you successfully upload the code to your board. You will see some prompt, input your credential information according to the prompts.

You can send a C2D message to your device. You can see the device prints out the message and blinks once receiving the message.

You can send start or stop device method command to your feather HUZZAH ESP8266 to start/stop sending message to your IoT hub.

Then you run a sample application on ESP8266 to collect the temperature and humidity data from a DHT22 sensor. Finally, you send the sensor data to your IoT hub. Note If you're using other ESP8266 boards, you can still follow these steps to connect it to your IoT hub. Depending on the ESP8266 board you're using, you might need to reconfigure the LED_PIN. For example, if you're using ESP8266 from AI-Thinker, you might change it from 0 to 2. Don't have a kit yet? Get it from the

• How to create an IoT hub and register a device for Feather HUZZAH ESP8266
• How to connect Feather HUZZAH ESP8266 with the sensor and your computer
• How to collect sensor data by running a sample application on Feather HUZZAH ESP8266
• How to send the sensor data to your IoT hub

To complete this operation, you need the following parts from your Feather HUZZAH ESP8266 Starter Kit:

• The Feather HUZZAH ESP8266 board
• A Micro USB to Type A USB cable You also need the following things for your development environment: Note The Arduino IDE version used by Visual Studio Code extension for Arduino has to be version 1.6.8 or later. Earlier versions don't work with the AzureIoT library. The following items are optional in case you don't have a sensor. You also have the option of using simulated sensor data. * An Adafruit DHT22 temperature and humidity sensor * A breadboard * M/M jumper wires ## Create an IoT hub

1. Sign in to the Azure portal.
2. Select Create a resource > Internet of Things > IoT Hub.
3. In the IoT hub pane, enter the following information for your IoT hub:

• Subscription: Choose the subscription that you want to use to create this IoT hub. * Resource group: Create a resource group to host the IoT hub or use an existing one. For more information.
• Region: Select the closest location to you.
• Name: Create a name for your IoT hub. If the name you enter is available, a green check mark appears. Important The IoT hub will be publicly discoverable as a DNS endpoint, so make sure to avoid any sensitive information while naming it.

4. Select Next: Size and scale to continue creating your IoT hub.

5. Choose your Pricing and scale tier. For this article, select the F1 - Free tier if it's still available on your subscription. For more information.

6. Select Review + create.

7. Review your IoT hub information, then click Create. Your IoT hub might take a few minutes to create. You can monitor the progress in the Notifications pane. Now that you have created an IoT hub, locate the important information that you use to connect devices and applications to your IoT hub. In your IoT hub navigation menu, open Shared access policies. Select the iothubowner policy, and then copy the Connection string---primary key of your IoT hub. For more information, see [Control access to IoT Hub]. Note You do not need this iothubowner connection string for this set-up tutorial. However, you may need it for some of the tutorials or different IoT scenarios after you complete this set-up. ![Get your IoT hub connection string]

1. In your IoT hub navigation menu, open IoT devices, then click Add to register a device in your IoT hub.
2. Enter a Device ID for the new device. Device IDs are case sensitive. Important The device ID may be visible in the logs collected for customer support and troubleshooting, so make sure to avoid any sensitive information while naming it.
3. Click Save.
4. After the device is created, open the device from the list in the IoT devices pane.
5. Copy the Connection string---primary key to use later.

Then you plug in your device to your computer for further use.

If you don't have a sensor, skip this section because you can use simulated sensor data instead.

For sensor pins, use the following wiring:

			    | Start (Sensor) | End (Board)      | Cable Color | 
		    	| -------------- | ---------------- | ----------- | 
		    	| VDD (Pin 31F)  | 3V (Pin 58H)     | Red cable   | 
		    	| DATA (Pin 32F) | GPIO 2 (Pin 46A) | Blue cable  | 
		    	| GND (Pin 34F)  | GND (PIn 56I)    | Black cable | 

Now your Feather Huzzah ESP8266 should be connected with a working sensor.