Code_NodeMCU_Blynk2_4Relay_Switch_ for Home Automation system.

Required Components :

    1. NodeMCU 2. 4-channel Relay Module (5V) 3. witches 4


  • 1. Download the Blynk App from Google play store or App store.
  • 2. Create a new project in the Blynk app. Enter the project name and choose the device. In this IoT project, I have used NodeMCU, so I have selected NodeMCU.
  • 3. After that Blynk will send an Auth Token to the registered email id. The Auth Token will be required while programming the ESP8266.

Connet Light(Electronic Equipments) Diagram


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