This code can be utilized for many home automation system.

I have commented on code

This code helps you to do many IoT projects using NodeMCU board

1.First of all you need to download and set up the blynk app and get the auth code

2.Then paste it in the code also fill up your WiFi name and password in the code.

3.Then save and compile

4.upload it to your NodeMCU board(tutorial is on youtube)

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Hello Govind