Switching an LED On/Off with Google Assistant

When I was searching for a project, I have seen this project. By seeing this I was intrested to do so, that made me to do it.

My project is about turning the led light on and off using the google assistant and the webhooks

Step 1: Hardware Setup

Plug the longer end of the LED in the Pin 0 of Bolt WiFi module shorter end to the ground pin (GND), and power on the Bolt WiFi module.

Step 2: Getting the Bolt API Key and Device ID

Login to cloud.boltiot.com and note the ID of your Bolt WiFi Module.

Now click on the API Tab and under the section for Generate Key, click on Enable.

Next click on the copy button to copy your API key. Your API key will may look something like this: f1f918e9-d9c2-4e5b-aed0-b7cb743f74cf

Step 3: Creating the GPIO Control Command

Since LED is a digital output device, we will need to get a Digital Write command that can be sent to Bolt over the Internet to switch on the LED.

Click here Bolt Cloud go to Docs Tab -> API Documentation -> GPIO Commands API -> Write Digital Output, to understand how to create a API command link to turn on or turn off a pin of the Bolt.

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.

The sample command to turn the led ON connected to device having ID BOLT13819450 to PIN 0 is:

https://cloud.boltiot.com/remote/f1f918e9-d9c2-4e5b-aed0-b7cb743f74cf/digitalWrite?pin=0&state=HIGH&deviceName=BOLT13819450

Make sure that you change the API Key to your own API Key and device ID which you got in the previous step.If you have connected the LED to any other pin other then Pin 0 then make a suitable change in the pin no in your code.

Step 4: IFTTT Integration via Google Assistant and Webhooks

Go to IFTTT to create a new applet by clicking here

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

Click on '+This' to create the trigger.

Choose Google Assistant -> Say Specific Phrase

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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'

Click on '+That'

Select Webhooks and then Make a web request.

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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.

https://cloud.boltiot.com/remote/f1f918e9-d9c2-4e5b-aed0-b7cb743f74cf/digitalWrite?pin=0&state=LOW&deviceName=BOLT13819450

That's It, You're 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.

Conclusion

Have a go at this project and in case you like our Cloud Connected Display, check out our store by clicking here You can check out some other projects from Bolt IoT here.

Full Disclosure: I am an Embedded systems developer of the Bolt IoT Platform. So I will praise it quite frequently during this blog, not only because I have to sell it but also because I sincerely believe that one of the best IoT platform ever. I have used many other IoT Platforms in the past and Bolt makes IoT development seamless like none other.