LED Blink With ESP32 and Blynk

Controlled LED using ESP32 with Blynk App

Prateek 24/12/2022

0 3,746 2 minutes read

Table of Contents

Introduction

In this Project, We Will Build A Small Home Automation System using ESP32 And the Blynk App. we will use the Arduino IDE Software for programming. we control the home applications wirelessly.

Also, we show how to control the LED over the internet using the Blynk application. so we make this tutorial the basis for the projects I will create more projects in future.

Just flow the Blog and Install ESP32 Driver in Arduino Ide

this tutorial is very used in future projects. just flow the blog and do step by step.

Bill Of Materials

S.N	Component	Quantity	Link To Buy
1	ESP32 Module	1
2	LED	4
3	Bradboard	1

ESP32 Board

In this Project, we Used The ESP32 Board so many GPIO Pins are Available to connect to multiple Systems.

Features

Includes Chip is CP2102 USB-UART Bridge
IS operating Power Supply is 5v
IS also Supported three Modes Ap, STA and AP+STA
IS Also Supports the RTOS

LED’s

LED (Light-Emitting Diode)

Image Reference

is 2 pin Anode(+) and Cathode(-)
is operating voltage is 1.5v to 3v

Circuit Diagram

We just connected the led to ESP32 Pin Number Is 33,26,14 And 13

Source Code

Blynk Library — Download

Before You upload the Code You Just Change The Auth token and Wifi Credentials

#define BLYNK_TEMPLATE_ID "TMPLjOi0Rz-W"
#define BLYNK_DEVICE_NAME "esp32"
#define BLYNK_AUTH_TOKEN "UF3ok0_l0VkhTDS-WD1gWZ65DdhnHpwx"

#define BLYNK_TEMPLATE_ID "TMPLjOi0Rz-W"

#define BLYNK_DEVICE_NAME "esp32"

#define BLYNK_AUTH_TOKEN "UF3ok0_l0VkhTDS-WD1gWZ65DdhnHpwx"

char ssid[] = "prateek";
char pass[] = "@@12345";

1 2	char ssid[] = "prateek"; char pass[] = "@@12345";

//Prateek
//www.prateeks.in
//https://www.youtube.com/c/JustDoElectronics

#define BLYNK_TEMPLATE_ID "TMPLjOi0Rz-W"
#define BLYNK_DEVICE_NAME "esp32"
#define BLYNK_AUTH_TOKEN "UF3ok0_l0VkhTDS-WD1gWZ65DdhnHpwx"


#define BLYNK_PRINT Serial


#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

char auth[] = BLYNK_AUTH_TOKEN;

char ssid[] = "prateek";
char pass[] = "@@12345";

BlynkTimer timer;


#define button1_pin 5
#define button2_pin 10
#define button3_pin 19
#define button4_pin 21

#define led1_pin 13
#define led2_pin 14
#define led3_pin 26
#define led4_pin 33

int led1_state = 0;
int led2_state = 0;
int led3_state = 0;
int led4_state = 0;

#define button1_vpin    V1
#define button2_vpin    V2
#define button3_vpin    V3 
#define button4_vpin    V4

BLYNK_CONNECTED() {
  Blynk.syncVirtual(button1_vpin);
  Blynk.syncVirtual(button2_vpin);
  Blynk.syncVirtual(button3_vpin);
  Blynk.syncVirtual(button4_vpin);
}

BLYNK_WRITE(button1_vpin) {
  led1_state = param.asInt();
  digitalWrite(led1_pin, led1_state);
}

BLYNK_WRITE(button2_vpin) {
  led2_state = param.asInt();
  digitalWrite(led2_pin, led2_state);
}

BLYNK_WRITE(button3_vpin) {
  led3_state = param.asInt();
  digitalWrite(led3_pin, led3_state);
}

BLYNK_WRITE(button4_vpin) {
  led4_state = param.asInt();
  digitalWrite(led4_pin, led4_state);
}


void setup()
{

  Serial.begin(115200);
  pinMode(button1_pin, INPUT_PULLUP);
  pinMode(button2_pin, INPUT_PULLUP);
  pinMode(button3_pin, INPUT_PULLUP);
  pinMode(button4_pin, INPUT_PULLUP);
  
  pinMode(led1_pin, OUTPUT);
  pinMode(led2_pin, OUTPUT);
  pinMode(led3_pin, OUTPUT);
  pinMode(led4_pin, OUTPUT);


  digitalWrite(led1_pin, HIGH);
  digitalWrite(led2_pin, HIGH);
  digitalWrite(led3_pin, HIGH);
  digitalWrite(led4_pin, HIGH);
  
  Blynk.begin(auth, ssid, pass);
 
}

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

void listen_push_buttons(){
    if(digitalRead(button1_pin) == LOW){
      delay(200);
      control_led(1);
      Blynk.virtualWrite(button1_vpin, led1_state); 
    }
    else if (digitalRead(button2_pin) == LOW){
      delay(200);
      control_led(2);
      Blynk.virtualWrite(button2_vpin, led2_state); 
    }
    else if (digitalRead(button3_pin) == LOW){
      delay(200);
      control_led(3);
      Blynk.virtualWrite(button3_vpin, led3_state); 
    }
    else if (digitalRead(button4_pin) == LOW){
      delay(200);
      control_led(4);
      Blynk.virtualWrite(button4_vpin, led4_state); 
    }
}

void control_led(int led){

  if(led == 1){
    led1_state = !led1_state;
    digitalWrite(led1_pin, led1_state);
    Serial.print("led1 State = ");
    Serial.println(led1_state);
    delay(50);
  }

  else if(led == 2){
    led2_state = !led2_state;
    digitalWrite(led2_pin, led2_state);
    delay(50);
  }
  
  else if(led == 3){
    led3_state = !led3_state;
    digitalWrite(led3_pin, led3_state);
    delay(50);
  }

  else if(led == 4){
    led4_state = !led4_state;
    digitalWrite(led4_pin, led4_state);
    delay(50);
  }
  
}

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//Prateek

//www.prateeks.in

//https://www.youtube.com/c/JustDoElectronics

#define BLYNK_TEMPLATE_ID "TMPLjOi0Rz-W"

#define BLYNK_DEVICE_NAME "esp32"

#define BLYNK_AUTH_TOKEN "UF3ok0_l0VkhTDS-WD1gWZ65DdhnHpwx"

#define BLYNK_PRINT Serial

#include <WiFi.h>

#include <WiFiClient.h>

#include <BlynkSimpleEsp32.h>

char auth[] = BLYNK_AUTH_TOKEN;

char ssid[] = "prateek";

char pass[] = "@@12345";

BlynkTimer timer;

#define button1_pin 5

#define button2_pin 10

#define button3_pin 19

#define button4_pin 21

#define led1_pin 13

#define led2_pin 14

#define led3_pin 26

#define led4_pin 33

int led1_state = 0;

int led2_state = 0;

int led3_state = 0;

int led4_state = 0;

#define button1_vpin V1

#define button2_vpin V2

#define button3_vpin V3

#define button4_vpin V4

BLYNK_CONNECTED() {

Blynk.syncVirtual(button1_vpin);

Blynk.syncVirtual(button2_vpin);

Blynk.syncVirtual(button3_vpin);

Blynk.syncVirtual(button4_vpin);

}

BLYNK_WRITE(button1_vpin) {

led1_state = param.asInt();

digitalWrite(led1_pin, led1_state);

}

BLYNK_WRITE(button2_vpin) {

led2_state = param.asInt();

digitalWrite(led2_pin, led2_state);

}

BLYNK_WRITE(button3_vpin) {

led3_state = param.asInt();

digitalWrite(led3_pin, led3_state);

}

BLYNK_WRITE(button4_vpin) {

led4_state = param.asInt();

digitalWrite(led4_pin, led4_state);

}

void setup()

{

Serial.begin(115200);

pinMode(button1_pin, INPUT_PULLUP);

pinMode(button2_pin, INPUT_PULLUP);

pinMode(button3_pin, INPUT_PULLUP);

pinMode(button4_pin, INPUT_PULLUP);

pinMode(led1_pin, OUTPUT);

pinMode(led2_pin, OUTPUT);

pinMode(led3_pin, OUTPUT);

pinMode(led4_pin, OUTPUT);

digitalWrite(led1_pin, HIGH);

digitalWrite(led2_pin, HIGH);

digitalWrite(led3_pin, HIGH);

digitalWrite(led4_pin, HIGH);

Blynk.begin(auth, ssid, pass);

}

void loop()

{

Blynk.run();

timer.run();

listen_push_buttons();

}

void listen_push_buttons(){

if(digitalRead(button1_pin) == LOW){

delay(200);

control_led(1);

Blynk.virtualWrite(button1_vpin, led1_state);

}

else if (digitalRead(button2_pin) == LOW){

delay(200);

control_led(2);

Blynk.virtualWrite(button2_vpin, led2_state);

}

else if (digitalRead(button3_pin) == LOW){

delay(200);

control_led(3);

Blynk.virtualWrite(button3_vpin, led3_state);

}

else if (digitalRead(button4_pin) == LOW){

delay(200);

control_led(4);

Blynk.virtualWrite(button4_vpin, led4_state);

}

void control_led(int led){

if(led == 1){

led1_state = !led1_state;

digitalWrite(led1_pin, led1_state);

Serial.print("led1 State = ");

Serial.println(led1_state);

delay(50);

}

else if(led == 2){

led2_state = !led2_state;

digitalWrite(led2_pin, led2_state);

delay(50);

}

else if(led == 3){

led3_state = !led3_state;

digitalWrite(led3_pin, led3_state);

delay(50);

}

else if(led == 4){

led4_state = !led4_state;

digitalWrite(led4_pin, led4_state);

delay(50);

}

Blynk App Setup

What is the Blynk App???

Blynk App is a simple and open-source IoT Platform for iOS and Android devices. you just customized the dashboard to your requirements.is so many widgets available Like Buttons, Display, Sliders and LED?

We just control the LED Light remotely ON and OFF over the internet using the ESP32 Board, we will just show a simple example of how to use the New Blynk app Platform. so this blog will help in future to create so many projects.