The aim of this paper is to build IoT-based home automation system using Wi-Fi based microcontroller. As the technological spectrum continues to expand every day, we are making our tech advancements in smartphone, robotics, machine learning, so why an exemption for our house. Today's homes are increasingly being switched from ordinary / human input-based appliances to smart / IoT powered appliances that can be remotely controlled.Presently, existing devices for domestic automation use only the device's hardware. But, in a nutshell, we 're making our IoT gadgets not available to our houses. As far as this paper is concerned, the NodeMCU (ESP8266) microcontroller, along with the Relays, is used to remotely control electrical switches from the BLYNK application. Users will monitor switches using the Application after authentication.