Home automation using NodeMCU and Blynk App

CHECK OUT MY VIDEO

(I have provided detailed steps to build the project mentioned in the video. Scroll down further to access the steps).

About

Hi Friends Welcome to Akshit innovation lab.

In this IoT based project, we will learn how to do Home automation using NodeMCU and Blynk App. This is a simple but useful home automation project using Nodemcu and a relay module. Through this project, we can control home appliances securely from the smartphone. During the video, I have shared the circuit diagram, Arduino sketch, Blynk example library for this internet of things project. If you have any doubts contact me at my e-mail id: akshitinnovationlab@gmail.com. The project can be used for school projects.

CONNECTION PART

Step:1

Lets begin the connections. Connect the Relay module IN1 wire to D3 of ESP8266

Step:2

As a second step, connect IN2 wire from relay module to D4 of ESP8266

Step:3

Now connect the IN3 wire from relay module to D5 of ESP8266

Step:4

Now connect the IN4 wire from relay module to D6 of ESP266

Step:5

Now connect the ground wire from relay module to ground of ESP8266

Step:6

Now connect the +5 volt wire from relay module to VCC of ESP8266

Blynk Part

Step:1

Download the Blynk app from online

Step:2

At the time of registering in Blynk app from mobile you will receive the authorization code to your email id. Please take a note of it.

Step:3

Please provide the project name. Post which we need to create the controlling buttons. I'm creating four buttons here.

Step:4

The pin number for the button 1 is "GPO0". GPO0 means D2 in Arudino. The respective pin information, I have provided in the circuit diagram in description. Now second button is named as GPO2.

Step:5

Third button is GPO14 and Fourth is GPO12.

Step:6

You can name the buttons to represent the respective electrical device you are trying to control. Now I'm renaming the first button to "Fan".

Step:7

You can even provide your name for any button.

Step:8

Change all the buttons to switch mode

Step:9

Now change each button from 0, 1 mode to 1, 0 mode

Step:10

Please use this step, only when the buttons are not performing the function as intended. Else leave them to default 0, 1 mode.

You can even choose specific colors for your buttons

Now we have completed Blynk setup

CODING PART

Okay, lets go to coding. You can download Arduino IDE app from Microsoft store. I have already downloaded and installed it.

Open the app, go to File menu -> Preferences -> Copy paste this link http://arduino.esp8266.com/stable/pac...

Open tools -> board Manager -> Install Latest Version of ESP8266 Board

Now click on the github link -> Blynk release -> open the zip -> paste it in Arduino data in documents

Open -> Example -> Blynk-> Board Wi-fi -> Esp8266 Standalone

In the code you have to change 3 things

Change 1:

Paste your Auth token that you received in your email (when you logged into Blynk) in Char Auth coding line.

Change 2:

paste your WiFi name in char SSID code line

Change 3:

paste your password in (char pass in the code)

Now select the board as nodemcu 1.O ESP 12-E Module and select the port

Now lets control the relay module using the phone. As you see, we are able to switch on and off the lights. In relay module lets learn how to connect to the relay module to the home light connection. If you are trying to connect the relay module directly to the electrical board. Use a two way switch. I'm also planning to demonstrate how to connect the relay directly to electrical board via two switch. This I will do it during the part II of the video. If you are trying to connect the relay module to the switch board. Please seek professional support. Do not try on your own. Since I'm unable to get the professional support. I have connected light with plug. You can also do this in a bulb.

RELAY CONNECTION

STEP: 1 In relay, take the negative in light wire and connect to the middle of channel 1 in relay

STEP: 2 Now take plug's negative wire to the left side middle of the relay module

STEP: 3 Now join both the positive