How to control RGB LED bulb using ESP8266 and Blynk app

Hello, welcome back. Today we are going to learn how to control an RGB LED bulb using the Nodemcu ESP8266 board and the Blynk app. Also, this project belongs to IoT technology. So use the knowledge in this tutorial for your future projects. OK, we will learn this tutorial step by step.

What is an RGB LED?

This bulb is also a standard LED bulb but includes the three main colors R (Red), G (Green), and B (Blue). Also, we can light up these colors one by one. A typical LED bulb has two pins, but these LEDs have four pins. Here we can identify the three pins as the three-color anode (+) pins and the other pin as the Cathode (-) pin. Also, the cathode (-) pin is slightly longer than the other pins. So we can easily recognize it.

How does this project work?

When the Nodemcu board is powered on, the Nodemcu board connects to the Blynk cloud through the internet. Afterward, when the slider widget values are changed, these values are received by the Nodemcu board over the Blynk cloud. Then, the RGB LED bulb colors change one by one. We can do this as we like.

OK, let’s do this project step by step. For that, the required components are given below.

• Nodemcu ESP8266 board x 1 — Amazon / Our Store
• RGB LED bulb x 1 — Amazon / Our Store
• 180-ohm resistor x 3 — Amazon / Our Store
• Bredboard x 1 — Amazon / Our Store
• Jumper wires — Amazon / Our Store

Disclosure: These Amazon links are Affiliate links. As an Amazon Associate, I earn from qualifying purchases.

Step 1

Firstly, identify these components.

Nodemcu ESP8266 board

RGB LED bulb

180-ohm resistor

Breadboard

Jumper wires

Step 2

Secondly, connect these components. To do this, use the circuit diagram below.

Step 3

Thirdly, let’s set up the Blynk app. For that, use the steps below.

• First, download and install the Blynk app on your phone. Then, sign up using your Gmail. Next, click the new project button.
• 
• Now, enter the project name. After, select board type and connection type. Then click the “confirm” button.
• 
• OK, now you can see the empty project interface. Then click on the “+” icon in the corner.
  
• Next, add the three slider widgets to the interface and customize them to your liking.
  
  
• Now, click on the slider one by one and change the slider name to your liking. Also, set the pins to D0, D1, and D2. Then, set the output value from 0 to 255.
• 

Step 4

OK, let’s creates the program for this project. It is as follows.

• WIFI library — Download
• Blynk library — Download
• The complete program of this project – Download

/*RGB LED with Nodemcu board.
  created by the SriTu Hobby team.
  Read the code below and use it for any of your creations.
  https://srituhobby.com/
*/
#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

char auth[] = "";//Enter your Auth token
char ssid[] = "";//Enter your WIFI name
char pass[] = "";//Enter your WIFI password

void setup() {
  pinMode(D0, OUTPUT);
  pinMode(D1, OUTPUT);
  pinMode(D2, OUTPUT);
  Blynk.begin(auth, ssid, pass);

}
void loop() {
  Blynk.run();
}

Code explanation

First, it includes WIFI and Blynk libraries.
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

Next, enter your WIFI connection details and Blynk auth token.
char auth[] = “rP7PvKDHMmXFU7GAEL5q-W9Xh4YrI3Ly”;//Enter your Auth token
char ssid[] = “Lakshan 4G”;//Enter your WIFI name
char pass[] = “1234”;//Enter your WIFI password

In the setup function, the RGB LED pins set as output pins. Also, the Blynk app connection has been started.
void setup() {
pinMode(D0, OUTPUT);
pinMode(D1, OUTPUT);
pinMode(D2, OUTPUT);
Blynk.begin(auth, ssid, pass);
}

In the loop function, the blink application is activated.
void loop() {
Blynk.run();
}

Step 5

Lastly, select board and port. After, upload this code to the Nodemcu board.

Now, run the Blynk app and changing the slider values. Ok, enjoy this project. The full video guide is given below. So, we will meet in the next tutorial.

How to control RGB LED bulb using ESP8266 and Blynk app