Controlling LED with Google Assistant

Problem

Ever felt a need for an assistant to do your tasks for you? Here let’s build an awesome project to control a LED with Google Assistant. Simply say ‘ON’ or ‘OFF’ and let the device do its task. Let’s begin.

Hardware setup

• Put one leg of the 330 ohm resister to any GPIO pins (here PIN 0) and wind the other leg to the longer leg (positive) of the LED.
• Put the shorter leg of the LED (negative) to GND of Bolt Wifi module with a jumper wire (Ref pic).

• Plug on your Bolt Wifi module.

Software Programming

Step 1: Find your Bolt module’s API Key and Device ID

• Visit this website cloud.boltiot.com and note down the Bolt Device ID (Like BOLT13166914).
• In the same page, click on the API tab and click ‘Enable’ and generate a key and note down the API key (Like 7bbd2431-ab09-44e0-909b-8dc66770fbfb).

Step 2: Understand the GPIO control commands of Bolt

• Visit this link to view the Bolt Document to understand creating an API command link to turn on/off an LED
• Learn the structure of the digitalWrite command:

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

3. Replace the Device ID and API Key as found in Step 1 and PIN_NUMBER is the port to which the LED is connected (Here it is 0).(Note down the URL for future use)

Here, it is, for

ON - https://cloud.boltiot.com/remote/7bbd2431-ab09-44e0-909b-8dc66770fbfb /digitalWrite?pin=0&state=HIGH&deviceName= BOLT13166914

OFF - https://cloud.boltiot.com/remote/7bbd2431-ab09-44e0-909b-8dc66770fbfb /digitalWrite?pin=0&state=LOW&deviceName= BOLT13166914

Step 3: Integrate to Google Assistant and Web Hooks via IFTTT

• Visit IFTTT website using this link and login.

(Note: You need to repeat the below steps twice to create an applet for ON and OFF)

2. Click on ‘If This’. This is used to create a trigger.

3. Choose ‘Google Assistant’.

4. Click on ‘Say a simple phrase’.

5. Type your desired phrases to trigger the action (Ref picture).

6. Click on ‘Create Trigger’

7. Now click on ‘Then That’. This is used to make a web request.

8. Choose ‘Webhooks’. Navigate using search bar for convenience.

9. Select ‘Make a web request’.

10. Fill out the action field columns as per the following (Ref picture):

• URL: Copy paste the URL written in Step 2 (for ON/OFF)
• Method: GET
• Content Type: application/json

11. Click on ‘Create action’

12. Finally click on ‘Finish’

(Now repeat the same for OFF (Ref pic))

Once you complete creating 2 applets your project is done. And now it’s time to TEST!!!

Step 4: Test your build

Take out you phone, open google assistant and say out the triggering phrase you had set in Step3(5) and watch your LED turn ON/OFF.

Conclusion

KUDOS!!! You have successfully deployed this project and now can control LED with your Android device. Thank You.