LED Control Using Blynk App and Arduino




About: now studying computer science engineering.Interest in technology,programming,gaming and hacking.

In this project we about to know switching on/off LED with arduino using blynk app,Instead of using Wifi module,Bluetooth module,GSM module etc. It is another way of using Internet of things Don't think it is difficulty.It's easy to learn.If you don't have the blynk app link is there below it,download now.


Step 1: Components&Connections

Components required are

1. Arduino Uno with cable

2. breadboard

3.Jumper wires


5.mobile with blynk app


1st you need to connect the 2 pins are connected to arduino. In LED small pin is connected to GND and other pin is connected to digital pin 13.there is another way of connection. LED is connected to breadboard and the jumper wires are connected to arduino to breadboard.Don't worry I'll explain about this. first connect the LED to breadboard small pin to -ve terminal big pin to +ve terminal.take 2 jumper wires(male to male) and connect to 2 terminals of breadboard and GND and digital pin of arduino.

Step 2: Create Your Project on Blynk App and Copy the Auth Token on Arduino Software

If you Don't have blynk app download on google playstore. after downloading of blynk app open it now and log in (or) connect with facebook is the best way to log in. after login create your project name,choose your device(hardware) and select your connection type after completing tap on create button it sends the auth token to your email-id. open your email-id copy your auth token send by blynk app. open your arduino IDE click on file goto examples to blynk to boards_USB_serial and click on Arduino_serial_USB. After click on Arduino_serial_USB on char auth[ ]="your auth token".remove 'your auth token' paste your token it on what you have copied on mail.

Step 3: Final Step

After creating the project on blynk goto your created project, swipe left it shows widget box and select the button widget.Tap the button it goes to button settings select digital pin 13 after you can select push and switch mode. After click on blynk-ser and it shows serial port and type your port .

PRECAUTIONS:- 1.Do not close the blynk-ser after typing your port.

2.In LED small pin was connected to GND and big pin was connected to digital pin 13.

After completion of this process go to blynk app go to your project and tap on play symbol button it will shows the online or offline. tap your button and the LED light blinks.



    • Arduino Contest 2019

      Arduino Contest 2019
    • Trash to Treasure

      Trash to Treasure
    • Tape Contest

      Tape Contest

    7 Discussions


    11 months ago

    Bynk-ser window doesnt ask for typing d port number..... what to do?

    1 reply
    sriram yashwanthAshwaryanaik

    Reply 11 months ago

    check whether the port is there or not in arduino IDE software.To see the port check out on tools on IDE.If the port is in disable close it again open it.Again check out on tools.After enable the port open the blynk-ser it asks the port no. that you will found in corner in the IDE. thank you


    1 year ago


    Wehre is "Blynk-ser" in step 3


    1 reply
    sriram yashwanthrexty37

    Reply 1 year ago

    The 1st photo is Blynk-ser. To open blynk-ser 1st extract the Blynk_Release_v0.48,then open the Blynk_Release_v0.48,click on libraries,next click on blynk then go to scripts and you'll found the "Blynk-ser". thank you


    1 year ago

    Great first instructable! That's a neat way to set it up :)

    1 reply

    1 year ago

    Thank you for posting this.