Published January 5, 2025 © GPL3+

Simplifying IoT: Build an LED Controller with Blynk and ESP8

Blynk makes IoT easy! Create an LED controller on ESP8266 and manage it worldwide with just a few lines of code.

IntermediateFull instructions provided1 hour43

Simplifying IoT: Build an LED Controller with Blynk and ESP8

Things used in this project

Hardware components

NodeMCU ESP8266 Breakout Board

SparkFun LilyPad LED Blue (5pcs)

Software apps and online services

Arduino IDE

Blynk

Story

This tutorial demonstrates how to control an LED remotely using Blynk and ESP8266. By integrating with the Blynk Cloud, you’ll create a reliable IoT system that works across Wi-Fi and mobile networks. The project highlights key features of Blynk, such as virtual pins and intuitive dashboards. You’ll learn to configure datastreams for LED control and brightness adjustment. Step-by-step instructions simplify setting up the Blynk app and connecting your microcontroller

The video tutorial can be found here

Code

Controlling LED with ESP8266 and BLYNK app

#define BLYNK_TEMPLATE_ID           "TMPL4auv4TEh5"
#define BLYNK_TEMPLATE_NAME         "LEDcontrol"
#define BLYNK_AUTH_TOKEN            "JSNDzCPaWyAyop0q1R_6Nn9oVco717HY"

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

char ssid[] = "******";
char pass[] = "******";

const int ledPin = D2;  // Pin D2 (GPIO 4)

BLYNK_WRITE(V0)  // This function is triggered when Virtual Pin V1 changes
{
  int value = param.asInt();  // Get the value from the Blynk app (0 or 1)
  digitalWrite(ledPin, value);  // Set the LED pin to HIGH or LOW
}

void setup() {
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);  // Ensure LED is OFF initially
  
  Serial.begin(9600);
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
}

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