OK Google! and Switch the LED On and Off Through Your Phone

Ever wonder what else you can do using Google Assistant on your phone? In this blog, I will show how can you switch an LED on and off via Google Assistant.

If your LED is connected to the Bolt IoT platform, then you can switch an LED on and off from thousands of miles away through the setup of your phone's Google Assistant.

Steps:

• 1.Hardware Connection

Connect the longer end of the Led i.e the Positive end of Led to Pin 0 of the Bolt Wifi Module and Connect the Shorter end of the Led i.e the Negative end of the Led to GNDPin of the Bolt Wifi Module

• 2.Exact Bolt API Key and Device ID

The Bolt API Key and Device ID can be found on the Bolt Cloud by logging into your account

• 3.Creating the GPIO Control Command

The structure of the command is:

https://cloud.boltiot.com/remote/API_KEY/digitalWrite?pin=PIN_NUMBER&state=HIGH/LOW&deviceName=DEVICE_ID

The parameters that you need to replace are:API_KEY: You can get it from API tab on cloud dashboard.PIN_NUMBER: Pin to which you have connected the LED. Values can be either 0, 1, 2, 3 or 4HIGH/LOW: This value indicates if you want to turn on/off the LED. HIGH will turn it on, LOW will turn it off.DEVICE_ID: The id of your device. You can get it from cloud dashboard.

• 4.Use IFTTT to connect the Webhooks to Google Assistant.

i. Go to IFTTT to create a new applet

ii. Login using your Gmail account. Make sure you use same account which you'll be using on your mobile to interact with Google Assistant.

iii. Click on '+This' to create the trigger.

iv. Choose Google Assistant -> Say Simple Phrase

v. Type the phrase you want to trigger the action. Make sure to specify the trigger command in different ways for example I used

a) Turn the lights on

b) Turn on the lights

c) Lights on

Click on 'Create Trigger'

Once, You are done by creating a trigger to Switch on the Led

The applet will look like this :

Click on '+That'

Select Webhooks and then Make a web request.

Enter the API URL you got in the previous Step. Make sure that you change the API Key and device name.

Method will be GET

Content type will be Application/json

Here is how your screen will look like

Click on 'Create Action' and then Click on 'Finish'

Steps to Turn OFF the LED

Now do the same process for a command to switch of the LED. Here you will change the state to LOW i.e. state=LOW in your code. Here is a sample of the code. Also, add a suitable phrase to switch off the LED.

Once, You are done by creating a trigger to Switch Off the Led

The applet will look like this :

That's it. You are done.

Now wake your Android phone by saying "OK Google" and say the phrase you had set while creating the trigger to see the magic happen.

VIDEO

Output

You can then call your Google Assistant in this manner to switch the LED on/off.