Home Automation Smart Plugin with ESP8266 & Blynk

Things

This project is a perfect beginner project that doesn't need very many parts. You will need a ESP8266, a relay, 3 male - female jumper wires, a spare plugin wire, and an outlet box with an outlet and outlet cover.

Putting it Together

First, connect the relay to the ESP8266 as shown below.

ESP - Relay

+5V - +

GND - --

D4 - Signal

Make sure signal is connected to D4.

Code Explanation

If you need help with using an ESP8266 with Arduino IDE, use this other tutorial.

#define BLYNK_PRINT Serial

#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

Including Blynk libraries.

char auth[] = "your_auth";
char ssid[] = "your_ssid";
char pass[] = "your_pass";

#define relay 2 //GPIO2, D4

Blynk info and relay pin.

int state;

BLYNK_WRITE(V0){
  state = param.asInt();
}

Blynk input saved to state variable.

void setup() {
  Serial.begin(9600);
  Blynk.begin(auth, ssid, pass);
  pinMode(relay, OUTPUT);
}

In setup, we start the serial, Blynk and setup the pin mode.

void loop() {
  digitalWrite(relay, state);
  Blynk.run();
}

Turn the relay on or off with the state variable and use Blynk.run(); to stay connected to the Blynk server.

Wrapping Up

If you have any questions, please post them in the comments.

Check out my other tutorials!

WiFi Repeater

LoRa and ESP8266 Gateway

IR RGB LEDs

Smart Plug

DHT11 with ESP8266

Automated Driveway Gates

and my website

My Website