Start communication between Hardwario Playground and Blynk

3. Prepare the Blynk IoT Application

1. Create an account on blynk.cloud by clicking Create new account.
2. Create a new Template (Create New Template), enter a name, choose Other as the hardware type, and the connection type doesn’t matter. Click Done to finish creating the template.
3. Now set up a new Datastream. On the template detail page, click the Datastreams tab. In the top right, click Edit. A + New Datastream button will appear — click it, choose Virtual Pin, and a dialog window will open.
4. Set a name for the new Datastream (for example, Notification) and choose one of the free Pins (any). In the mobile notification you’ll want to display illumination, so select Double as the data type.
5. At the top of the dialog window you are in the General settings. Switch to the Expose to Automation tab so the stream can be used in automations. In the selector next to it, choose Sensor and also check Condition and Action. Create the datastream by clicking Create.
6. Save your work using the Save button in the top right. Save your Template ID.

4. Create a Device in Blynk

1. In Blynk, go to Devices. Click + New Device to open the device creation dialog.
2. For the creation method, choose From template. In the next form, select your template and assign a name to the device. Click Create to finish the process.
3. Save the information provided by Blynk — you should already have the Template ID, and now you will obtain the Auth Token.

5. Move to Playground

1. In the Functions tab, find the nodes that work with the new version of Blynk — they are labeled under the Blynk IoT section.
2. To write values to the created datastream, choose the write node.
3. Double-click to open its settings.
4. On the right, click the small pencil — this opens a new window.
5. In the Url field, enter blynk.cloud. In the Auth Token and Template ID fields, paste the values from the device detail in the web application on your computer.
6. Confirm the settings by clicking Add.
7. Enter the number of the virtual pin of your datastream and click Done to save everything.
8. You can now set up your flow in Node-RED, where you connect the mqtt out node that provides illumination from the sensor to the write node for Blynk.

6. Set Up the Mobile App

1. Download the Blynk IoT app to your mobile device from the App Store or Google Play.
2. Sign in using your credentials.
3. On the home screen, you will see the device you created.
4. Open it by tapping and set up the dashboard:
   • Under the key icon in the top right, you’ll find the dashboard settings page.
   • In My Templates, find your template and tap it.
   • Tap + or anywhere on the canvas to add a new widget, for example Value Display.
   • Tap the added widget to open its settings window. The most important step is to assign the Datastream from your template for the selected virtual Pin.

7. Create an Automation

1. In the Blynk web app, switch to the Automation section and click + Create Automation.
2. From the available options, select Device State. The automation will trigger whenever you send a message to the application.
3. Automation setup takes place in two steps: When — when the automation should run, and Do this — what should happen.
4. First, configure the When section. Select your device and the created Datastream. A third selector will appear — leave it set to Is Any.
5. In the Do This section, click Send In-App Notification and set the recipient. For simplicity, set yourself here.
6. Drag the Trigger value item into the Subject and Message fields — this is a variable that will contain the text of your message.
7. Finally, don’t forget to set the name of the automation.
8. Click Save to save the automation.

8. Run It

1. In Hardwario Playground, click the Deploy button.
2. Change the illumination on your Climate module so you can see in Messages that it is sending a new value.
3. Check your phone to see if there is a new notification about the change in illumination and whether the Blynk app shows the current value.