ESP32 Based 4-Channel Relay Board Micro Controller Board Electronic (WiFi Bluetooth)

This tutorial of “Easy Electronics NodeMCU Based 4-Channel Relay Board” is an introduction with Blynk 2.0

Detailed Tutorial:

#define BLYNK_TEMPLATE_ID “TMPLCpH_YU9e”

#define BLYNK_DEVICE_NAME “Home Automation”

#define BLYNK_AUTH_TOKEN “kUIXkLYCBMhpEp7wLYuXTA1aJtpWuqRb”

#define BLYNK_PRINT Serial

#include <WiFi.h>

#include <BlynkSimpleEsp32.h>

// Your WiFi credentials.

// Set password to “” for open networks.

char ssid[] = “GNXS-297888”;

char pass[] = “1234567890”;

char auth[] = BLYNK_AUTH_TOKEN;

BLYNK_WRITE(V0) {

  int value = param.asInt();

  Serial.println(value);

  if (value == 1)

  {

    digitalWrite(D2, LOW);

    Serial.println(“LED ON”);

  }

  if (value == 0)

  {

    digitalWrite(D2, HIGH);

    Serial.println(“LED OFF”);

  }

}

BLYNK_WRITE(V1) {

  int value = param.asInt();

  Serial.println(value);

  if (value == 1)

  {

    digitalWrite(D3, LOW);

    Serial.println(“LED ON”);

  }

  if (value == 0)

  {

    digitalWrite(D3, HIGH);

    Serial.println(“LED OFF”);

  }

}

BLYNK_WRITE(V2) {

  int value = param.asInt();

  Serial.println(value);

  if (value == 1)

  {

    digitalWrite(D4, LOW);

    Serial.println(“LED ON”);

  }

  if (value == 0)

  {

    digitalWrite(D4, HIGH);

    Serial.println(“LED OFF”);

  }

}

BLYNK_WRITE(V3) {

  int value = param.asInt();

  Serial.println(value);

  if (value == 1)

  {

    digitalWrite(D5, LOW);

    Serial.println(“LED ON”);

  }

  if (value == 0)

  {

    digitalWrite(D5, HIGH);

    Serial.println(“LED OFF”);

  }

}

BLYNK_CONNECTED()

{

  Blynk.syncVirtual(V0);  // will cause BLYNK_WRITE(V0) to be executed

  Blynk.syncVirtual(V1);

  Blynk.syncVirtual(V2);

  Blynk.syncVirtual(V3);

}

void setup()

{

  digitalWrite(D2, HIGH);

  digitalWrite(D3, HIGH);

  digitalWrite(D4, HIGH);

  digitalWrite(D5, HIGH);

  Serial.begin(9600);

  Blynk.begin(auth, ssid, pass);

  pinMode(D2, OUTPUT);

  pinMode(D3, OUTPUT);

  pinMode(D4, OUTPUT);

  pinMode(D5, OUTPUT); 

}

void loop()

{

  Blynk.run();

}