In this home automation circuit, you can see the esp8266 is directly connected to the relay module which consists of 4 relays. and 4 appliances connected here. 3 bulbs and a fan. the connections are easy and clear. still, if you have any difficulties you can ask us in the comment section.

Introduction

Hey Hobbyist, Welcome back. I am back with another interesting IoT project. Today we gonna do home automation using Blynk App and NodeMCU. I hope you are familiar with Blynk App if not then see my previous article on it i.e.,

So without wasting time let’s head on the Blynk home automation project.

Working / blynk home automation working

Blynk based home automation is the simplest way to make an IoT-based home automation project.

here you need to configure the application.

how many buttons do you want in the application? it depends on the appliance you are gonna use with the system.

the app will be connected to the Blynk server. so when you click on the button on the app it will send the instruction to the server.

then the server will send a command to the Nodemcu which turns on and off the appliances.

Material required:

1. NodeMCU(ESP8266)
2. Relay Module(4 in 1)
3. LED(s) (for demonstration only)
4. A phone with the Blynk App installed
5. Manual Switch 
6. Jumper Wires
7. Breadboard

PIN WIRING:

Relay Pin 1 —> D1

Relay Pin 2 —> D2

Relay Pin 3 —> D5

Relay Pin 4 —> D6

Switch pin 1 —> SK

Switch pin 2 —> D3

Switch pin 3 —> D7

Switch pin 4 —> RX

Ir Resiver Pin -- Tx

Rest are VCC and GND connections

Control Mobile Application and Manual Switching 4Relay Module

Blynk website Link:- https://blynk.io/

Blynk App

Arduino IDE App

Source Code

Library

YouTube Video