Nodemcu not conneting with blynk app

lipu · September 10, 2021, 8:11pm

Hi all, i want to make a home automation system, where i can controll 1 fan with speed controll and 2 light, and also with manual switch. with real time feed back. but after uploading the code nodemcu not connecting with blynk app, can anyone help me please. I attach my code and schematics bellow.

My hardware is ‘’ lolin nodemcu v3 {nodemcu 0.9(ESP-12module), communication type:wifi.
Smartphone Os: android, version: android 11.
Blynk server.
blynk library version: 1.0.1

my code is below:

#define BLYNK_PRINT Serial
#include <WiFiClient.h>
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
BlynkTimer timer;


#define DEBUG_SW 1


// Pins of Fan Regulator Knob
#define s1  12  //D6
#define s2  13  //D7
#define s3  15  //D8
#define s4  16  //D0


// Pins of Switches
#define S5 9   //SD1
#define S6 10  //SD2

// Pins of Relay (Appliances Control)
#define R5 5  //D1
#define R6 4  //D2

// Pins of Relay (Fan Speed Control)
#define Speed1 0   //D3
#define Speed2 2   //D4
#define Speed4 14  //D5

// By default the mode is with_internet
int MODE = 0;

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "auth";

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "Lipu";
char pass[] = "lipu345678";

bool speed1_flag = 1;
bool speed2_flag = 1;
bool speed3_flag = 1;
bool speed4_flag = 1;
bool speed0_flag = 1;

int switch_ON_Flag1_previous_I = 0;
int switch_ON_Flag2_previous_I = 0;


BLYNK_WRITE(V0)
{
  int fan_speed = param.asInt(); // assigning incoming value from pin V1 to a variable
  if (fan_speed == 0)
  {
    speed0();
  }
  if (fan_speed == 1)
  {
    speed1();
  }
  if (fan_speed == 2)
  {
    speed2();
  }
  if (fan_speed == 3)
  {
    speed3();
  }
  if (fan_speed == 4)
  {
    speed4();
  }
}

BLYNK_WRITE(V1)
{
  int pinValue = param.asInt(); // assigning incoming value from pin V1 to a variable
  digitalWrite(R5, pinValue);
  // process received value
}

BLYNK_WRITE(V2)
{
  int pinValue = param.asInt(); // assigning incoming value from pin V2 to a variable
  digitalWrite(R6, pinValue);
  // process received value
}


void setup()
{
  // put your setup code here, to run once:
  pinMode(s1, INPUT);
  pinMode(s2, INPUT);
  pinMode(s3, INPUT);
  pinMode(s4, INPUT);
  pinMode(S5, INPUT);
  pinMode(S6, INPUT);

  pinMode(R5, OUTPUT);
  pinMode(R6, OUTPUT);
  pinMode(Speed1, OUTPUT);
  pinMode(Speed2, OUTPUT);
  pinMode(Speed4, OUTPUT);

  Serial.begin(9600);
  WiFi.begin(ssid, pass);

  timer.setInterval(3000L, checkBlynk); // check if connected to Blynk server every 3 seconds

  Blynk.config(auth);//, ssid, pass);
}


void loop()
{

  if (WiFi.status() != WL_CONNECTED)
  {
    if (DEBUG_SW) Serial.println("Not Connected");
  }
  else
  {
    if (DEBUG_SW) Serial.println(" Connected");
    Blynk.run();
  }


  timer.run(); // Initiates SimpleTimer

  if (MODE == 0)
    with_internet();
  else
    without_internet();
  // put your main code here, to run repeatedly:
}


void with_internet()
{

  // FOR FAN
  if (digitalRead(s1) == LOW && speed1_flag == 1)
  {
    speed1();
    Blynk.virtualWrite(V0, 1);
    speed1_flag = 0;
    speed2_flag = 1;
    speed3_flag = 1;
    speed4_flag = 1;
    speed0_flag = 1;


  }
  if (digitalRead(s2) == LOW && digitalRead(s3) == HIGH && speed2_flag == 1)
  {
    speed2();
    Blynk.virtualWrite(V0, 2);
    speed1_flag = 1;
    speed2_flag = 0;
    speed3_flag = 1;
    speed4_flag = 1;
    speed0_flag = 1;

  }
  if (digitalRead(s2) == LOW && digitalRead(s3) == LOW && speed3_flag == 1)
  {
    speed3();
    Blynk.virtualWrite(V0, 3);
    speed1_flag = 1;
    speed2_flag = 1;
    speed3_flag = 0;
    speed4_flag = 1;
    speed0_flag = 1;
  }
  if (digitalRead(s4) == LOW  && speed4_flag == 1)
  {
    speed4();
    Blynk.virtualWrite(V0, 4);
    speed1_flag = 1;
    speed2_flag = 1;
    speed3_flag = 1;
    speed4_flag = 0;
    speed0_flag = 1;
  }
  if (digitalRead(s1) == HIGH && digitalRead(s2) == HIGH && digitalRead(s3) == HIGH && digitalRead(s4) == HIGH  && speed0_flag == 1)
  {
    speed0();
    Blynk.virtualWrite(V0, 0);
    speed1_flag = 1;
    speed2_flag = 1;
    speed3_flag = 1;
    speed4_flag = 1;
    speed0_flag = 0;
  }


  // FOR SWITCH
  if (digitalRead(S5) == LOW)
  {
    if (switch_ON_Flag1_previous_I == 0 )
    {
      digitalWrite(R5, HIGH);
      if (DEBUG_SW) Serial.println("Relay1- ON");
      Blynk.virtualWrite(V1, 1);
      switch_ON_Flag1_previous_I = 1;
    }
    if (DEBUG_SW) Serial.println("Switch1 -ON");

  }
  if (digitalRead(S5) == HIGH )
  {
    if (switch_ON_Flag1_previous_I == 1)
    {
      digitalWrite(R5, LOW);
      if (DEBUG_SW) Serial.println("Relay1 OFF");
      Blynk.virtualWrite(V1, 0);
      switch_ON_Flag1_previous_I = 0;
    }
    if (DEBUG_SW)Serial.println("Switch1 OFF");
  }


  if (digitalRead(S6) == LOW)
  {
    if (switch_ON_Flag2_previous_I == 0 )
    {
      digitalWrite(R6, HIGH);
      if (DEBUG_SW)  Serial.println("Relay2- ON");
      Blynk.virtualWrite(V2, 1);
      switch_ON_Flag2_previous_I = 1;
    }
    if (DEBUG_SW) Serial.println("Switch2 -ON");

  }
  if (digitalRead(S6) == HIGH )
  {
    if (switch_ON_Flag2_previous_I == 1)
    {
      digitalWrite(R6, LOW);
      if (DEBUG_SW) Serial.println("Relay2 OFF");
      Blynk.virtualWrite(V2, 0);
      switch_ON_Flag2_previous_I = 0;
    }
    if (DEBUG_SW)Serial.println("Switch2 OFF");
    //delay(200);
  }

}  

void without_internet()
{

  // FOR FAN
  if (digitalRead(s1) == LOW && speed1_flag == 1)
  {
    speed1();

    speed1_flag = 0;
    speed2_flag = 1;
    speed3_flag = 1;
    speed4_flag = 1;
    speed0_flag = 1;


  }
  if (digitalRead(s2) == LOW && digitalRead(s3) == HIGH && speed2_flag == 1)
  {
    speed2();

    speed1_flag = 1;
    speed2_flag = 0;
    speed3_flag = 1;
    speed4_flag = 1;
    speed0_flag = 1;

  }
  if (digitalRead(s2) == LOW && digitalRead(s3) == LOW && speed3_flag == 1)
  {
    speed3();

    speed1_flag = 1;
    speed2_flag = 1;
    speed3_flag = 0;
    speed4_flag = 1;
    speed0_flag = 1;
  }
  if (digitalRead(s4) == LOW  && speed4_flag == 1)
  {
    speed4();

    speed1_flag = 1;
    speed2_flag = 1;
    speed3_flag = 1;
    speed4_flag = 0;
    speed0_flag = 1;
  }
  if (digitalRead(s1) == HIGH && digitalRead(s2) == HIGH && digitalRead(s3) == HIGH && digitalRead(s4) == HIGH  && speed0_flag == 1)
  {
    speed0();


    speed1_flag = 1;
    speed2_flag = 1;
    speed3_flag = 1;
    speed4_flag = 1;
    speed0_flag = 0;
  }


  // FOR SWITCH
  digitalWrite(R5, !digitalRead(S5));
  digitalWrite(R6, !digitalRead(S6));
}



// Fan Speed Control

void speed0()
{
  //All Relays Off - Fan at speed 0
  if (DEBUG_SW)Serial.println("SPEED 0");
  digitalWrite(Speed1, LOW);
  digitalWrite(Speed2, LOW);
  digitalWrite(Speed4, LOW);

}

void speed1()
{
  //Speed1 Relay On - Fan at speed 1
  if (DEBUG_SW)Serial.println("SPEED 1");
  digitalWrite(Speed1, LOW);
  digitalWrite(Speed2, LOW);
  digitalWrite(Speed4, LOW);
  delay(1000);
  digitalWrite(Speed1, HIGH);
}

void speed2()
{
  //Speed2 Relay On - Fan at speed 2
  if (DEBUG_SW)Serial.println("SPEED 2");
  digitalWrite(Speed1, LOW);
  digitalWrite(Speed2, LOW);
  digitalWrite(Speed4, LOW);
  delay(1000);
  digitalWrite(Speed2, HIGH);
}

void speed3()
{
  //Speed1 & Speed2 Relays On - Fan at speed 3
  if (DEBUG_SW)Serial.println("SPEED 3");
  digitalWrite(Speed1, LOW);
  digitalWrite(Speed2, LOW);
  digitalWrite(Speed4, LOW);
  delay(1000);
  digitalWrite(Speed1, HIGH);
  digitalWrite(Speed2, HIGH);

}

void speed4()
{
  //Speed4 Relay On - Fan at speed 4
  if (DEBUG_SW)Serial.println("SPEED 4");
  digitalWrite(Speed1, LOW);
  digitalWrite(Speed2, LOW);
  digitalWrite(Speed4, LOW);
  delay(1000);
  digitalWrite(Speed4, HIGH);
}


//Check Blynk Connectivity every 3 seconds

void checkBlynk()
{
  bool isconnected = Blynk.connected();
  if (isconnected == false)
  {
    MODE = 1;
  }
  if (isconnected == true)
  {
    MODE = 0;
  }
}

John93 · September 10, 2021, 8:23pm

Hey there. Are you using blynk legacy or blynk iot ?

lipu · September 10, 2021, 8:25pm

hellow , I am using Blynk legacy

John93 · September 10, 2021, 8:43pm

Have you tried to use library version 0.6.1 ?

lipu · September 10, 2021, 8:46pm

No, I am not tried.

John93 · September 10, 2021, 8:51pm

I would like you to try it. But first please edit your post, using the pencil icon at the bottom, and add triple backticks at the beginning and end of your code so that it displays correctly correctly.
Triple backticks look like this: ```

lipu · September 10, 2021, 8:57pm

ok, i am editing

lipu · September 10, 2021, 8:59pm

Here is my code

#define BLYNK_PRINT Serial
#include <WiFiClient.h>
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
BlynkTimer timer;


#define DEBUG_SW 1


// Pins of Fan Regulator Knob
#define s1  12  //D6
#define s2  13  //D7
#define s3  15  //D8
#define s4  16  //D0


// Pins of Switches
#define S5 9   //SD1
#define S6 10  //SD2

// Pins of Relay (Appliances Control)
#define R5 5  //D1
#define R6 4  //D2

// Pins of Relay (Fan Speed Control)
#define Speed1 0   //D3
#define Speed2 2   //D4
#define Speed4 14  //D5

// By default the mode is with_internet
int MODE = 0;

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "AUTH_TOKEN";

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "SSID";
char pass[] = "PASS";

bool speed1_flag = 1;
bool speed2_flag = 1;
bool speed3_flag = 1;
bool speed4_flag = 1;
bool speed0_flag = 1;

int switch_ON_Flag1_previous_I = 0;
int switch_ON_Flag2_previous_I = 0;


BLYNK_WRITE(V0)
{
  int fan_speed = param.asInt(); // assigning incoming value from pin V1 to a variable
  if (fan_speed == 0)
  {
    speed0();
  }
  if (fan_speed == 1)
  {
    speed1();
  }
  if (fan_speed == 2)
  {
    speed2();
  }
  if (fan_speed == 3)
  {
    speed3();
  }
  if (fan_speed == 4)
  {
    speed4();
  }
}

BLYNK_WRITE(V1)
{
  int pinValue = param.asInt(); // assigning incoming value from pin V1 to a variable
  digitalWrite(R5, pinValue);
  // process received value
}

BLYNK_WRITE(V2)
{
  int pinValue = param.asInt(); // assigning incoming value from pin V2 to a variable
  digitalWrite(R6, pinValue);
  // process received value
}


void setup()
{
  // put your setup code here, to run once:
  pinMode(s1, INPUT);
  pinMode(s2, INPUT);
  pinMode(s3, INPUT);
  pinMode(s4, INPUT);
  pinMode(S5, INPUT);
  pinMode(S6, INPUT);

  pinMode(R5, OUTPUT);
  pinMode(R6, OUTPUT);
  pinMode(Speed1, OUTPUT);
  pinMode(Speed2, OUTPUT);
  pinMode(Speed4, OUTPUT);

  Serial.begin(9600);
  WiFi.begin(ssid, pass);

  timer.setInterval(3000L, checkBlynk); // check if connected to Blynk server every 3 seconds

  Blynk.config(auth);//, ssid, pass);
}


void loop()
{

  if (WiFi.status() != WL_CONNECTED)
  {
    if (DEBUG_SW) Serial.println("Not Connected");
  }
  else
  {
    if (DEBUG_SW) Serial.println(" Connected");
    Blynk.run();
  }


  timer.run(); // Initiates SimpleTimer

  if (MODE == 0)
    with_internet();
  else
    without_internet();
  // put your main code here, to run repeatedly:
}


void with_internet()
{

  // FOR FAN
  if (digitalRead(s1) == LOW && speed1_flag == 1)
  {
    speed1();
    Blynk.virtualWrite(V0, 1);
    speed1_flag = 0;
    speed2_flag = 1;
    speed3_flag = 1;
    speed4_flag = 1;
    speed0_flag = 1;


  }
  if (digitalRead(s2) == LOW && digitalRead(s3) == HIGH && speed2_flag == 1)
  {
    speed2();
    Blynk.virtualWrite(V0, 2);
    speed1_flag = 1;
    speed2_flag = 0;
    speed3_flag = 1;
    speed4_flag = 1;
    speed0_flag = 1;

  }
  if (digitalRead(s2) == LOW && digitalRead(s3) == LOW && speed3_flag == 1)
  {
    speed3();
    Blynk.virtualWrite(V0, 3);
    speed1_flag = 1;
    speed2_flag = 1;
    speed3_flag = 0;
    speed4_flag = 1;
    speed0_flag = 1;
  }
  if (digitalRead(s4) == LOW  && speed4_flag == 1)
  {
    speed4();
    Blynk.virtualWrite(V0, 4);
    speed1_flag = 1;
    speed2_flag = 1;
    speed3_flag = 1;
    speed4_flag = 0;
    speed0_flag = 1;
  }
  if (digitalRead(s1) == HIGH && digitalRead(s2) == HIGH && digitalRead(s3) == HIGH && digitalRead(s4) == HIGH  && speed0_flag == 1)
  {
    speed0();
    Blynk.virtualWrite(V0, 0);
    speed1_flag = 1;
    speed2_flag = 1;
    speed3_flag = 1;
    speed4_flag = 1;
    speed0_flag = 0;
  }


  // FOR SWITCH
  if (digitalRead(S5) == LOW)
  {
    if (switch_ON_Flag1_previous_I == 0 )
    {
      digitalWrite(R5, HIGH);
      if (DEBUG_SW) Serial.println("Relay1- ON");
      Blynk.virtualWrite(V1, 1);
      switch_ON_Flag1_previous_I = 1;
    }
    if (DEBUG_SW) Serial.println("Switch1 -ON");

  }
  if (digitalRead(S5) == HIGH )
  {
    if (switch_ON_Flag1_previous_I == 1)
    {
      digitalWrite(R5, LOW);
      if (DEBUG_SW) Serial.println("Relay1 OFF");
      Blynk.virtualWrite(V1, 0);
      switch_ON_Flag1_previous_I = 0;
    }
    if (DEBUG_SW)Serial.println("Switch1 OFF");
  }


  if (digitalRead(S6) == LOW)
  {
    if (switch_ON_Flag2_previous_I == 0 )
    {
      digitalWrite(R6, HIGH);
      if (DEBUG_SW)  Serial.println("Relay2- ON");
      Blynk.virtualWrite(V2, 1);
      switch_ON_Flag2_previous_I = 1;
    }
    if (DEBUG_SW) Serial.println("Switch2 -ON");

  }
  if (digitalRead(S6) == HIGH )
  {
    if (switch_ON_Flag2_previous_I == 1)
    {
      digitalWrite(R6, LOW);
      if (DEBUG_SW) Serial.println("Relay2 OFF");
      Blynk.virtualWrite(V2, 0);
      switch_ON_Flag2_previous_I = 0;
    }
    if (DEBUG_SW)Serial.println("Switch2 OFF");
    //delay(200);
  }

}  

void without_internet()
{

  // FOR FAN
  if (digitalRead(s1) == LOW && speed1_flag == 1)
  {
    speed1();

    speed1_flag = 0;
    speed2_flag = 1;
    speed3_flag = 1;
    speed4_flag = 1;
    speed0_flag = 1;


  }
  if (digitalRead(s2) == LOW && digitalRead(s3) == HIGH && speed2_flag == 1)
  {
    speed2();

    speed1_flag = 1;
    speed2_flag = 0;
    speed3_flag = 1;
    speed4_flag = 1;
    speed0_flag = 1;

  }
  if (digitalRead(s2) == LOW && digitalRead(s3) == LOW && speed3_flag == 1)
  {
    speed3();

    speed1_flag = 1;
    speed2_flag = 1;
    speed3_flag = 0;
    speed4_flag = 1;
    speed0_flag = 1;
  }
  if (digitalRead(s4) == LOW  && speed4_flag == 1)
  {
    speed4();

    speed1_flag = 1;
    speed2_flag = 1;
    speed3_flag = 1;
    speed4_flag = 0;
    speed0_flag = 1;
  }
  if (digitalRead(s1) == HIGH && digitalRead(s2) == HIGH && digitalRead(s3) == HIGH && digitalRead(s4) == HIGH  && speed0_flag == 1)
  {
    speed0();


    speed1_flag = 1;
    speed2_flag = 1;
    speed3_flag = 1;
    speed4_flag = 1;
    speed0_flag = 0;
  }


  // FOR SWITCH
  digitalWrite(R5, !digitalRead(S5));
  digitalWrite(R6, !digitalRead(S6));
}



// Fan Speed Control

void speed0()
{
  //All Relays Off - Fan at speed 0
  if (DEBUG_SW)Serial.println("SPEED 0");
  digitalWrite(Speed1, LOW);
  digitalWrite(Speed2, LOW);
  digitalWrite(Speed4, LOW);

}

void speed1()
{
  //Speed1 Relay On - Fan at speed 1
  if (DEBUG_SW)Serial.println("SPEED 1");
  digitalWrite(Speed1, LOW);
  digitalWrite(Speed2, LOW);
  digitalWrite(Speed4, LOW);
  delay(1000);
  digitalWrite(Speed1, HIGH);
}

void speed2()
{
  //Speed2 Relay On - Fan at speed 2
  if (DEBUG_SW)Serial.println("SPEED 2");
  digitalWrite(Speed1, LOW);
  digitalWrite(Speed2, LOW);
  digitalWrite(Speed4, LOW);
  delay(1000);
  digitalWrite(Speed2, HIGH);
}

void speed3()
{
  //Speed1 & Speed2 Relays On - Fan at speed 3
  if (DEBUG_SW)Serial.println("SPEED 3");
  digitalWrite(Speed1, LOW);
  digitalWrite(Speed2, LOW);
  digitalWrite(Speed4, LOW);
  delay(1000);
  digitalWrite(Speed1, HIGH);
  digitalWrite(Speed2, HIGH);

}

void speed4()
{
  //Speed4 Relay On - Fan at speed 4
  if (DEBUG_SW)Serial.println("SPEED 4");
  digitalWrite(Speed1, LOW);
  digitalWrite(Speed2, LOW);
  digitalWrite(Speed4, LOW);
  delay(1000);
  digitalWrite(Speed4, HIGH);
}


//Check Blynk Connectivity every 3 seconds

void checkBlynk()
{
  bool isconnected = Blynk.connected();
  if (isconnected == false)
  {
    MODE = 1;
  }
  if (isconnected == true)
  {
    MODE = 0;
  }
}

John93 · September 10, 2021, 9:03pm

You should keep the void loop clean as much as possible

lipu · September 10, 2021, 9:08pm

I am new in this field , i found this project in youtube, can you help me ? i would be greatfull.

John93 · September 10, 2021, 9:10pm

Of course buddy, no problem at all.

lipu · September 10, 2021, 9:10pm

thanks bro

John93 · September 10, 2021, 9:12pm

John93 · September 10, 2021, 9:12pm

This video will help you

lipu · September 10, 2021, 9:13pm

there a problem that , i can not controll fan speed.

John93 · September 10, 2021, 9:20pm

A very basic solution is to replace the knob with relays

lipu · September 10, 2021, 9:26pm

in this case i have to connect 4 relays to knob, and they will controll with button switch by blynk, ?

John93 · September 10, 2021, 9:29pm

No I was taking about the solid state relay like this :

John93 · September 10, 2021, 9:31pm

This relay is a triac based and can be used with pwm signal to adjust the speed.

lipu · September 10, 2021, 9:32pm

can you give me ‘‘the scematic and the code’’ please